Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power WindowsRain Gear Wiper Systems
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



Username Post: Turboglide to Powerglide swap        (Topic#351341)
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
05-29-18 02:25 PM - Post#2735282    

Does anybody have a procedure for removing an original Turboglide and replacing it with a cast iron Powerglide? I'm working on my 1960 Nomad with a 348 engine. Thanks

Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
This Forum is Sponsored by
1-800-IMPALAS  *  www.impalas.com
Visit Impala Bob's forum on ChevyTalk
DonSSDD 
Silver Supporting Member
Posts: 6816
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-29-18 04:08 PM - Post#2735296    
    In response to Chevyfan60

Check the dimensions on the transmission and driveshaft length on the sticky on this forum, if they are the same length, it may be a bolt in? Cast iron powerglide had a spacer and if the turboglide has one, use it or you will need one to go with your ironglide.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
Jim Anselmo 
Poster
Posts: 21

Loc: Spokane, WA
Reg: 01-23-14
05-30-18 10:00 AM - Post#2735393    
    In response to Chevyfan60

Pretty sure the shift linkage is different as well. Hopefully the Powerglide still has it attached.


Jim
Dads 59 Sport Sedan


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
05-30-18 10:33 AM - Post#2735397    
    In response to Jim Anselmo

Thanks guys, I do have the adapter/spacer and the linkage is different. The turboglide uses a bracket that is welded to the frame and the powerglide just has a direct shift rod.

I'm curious about the starter - the spacer has a place for a horizontally mounted starter but with the turboglide in it now, it has a 3-bolt starter mounted directly to the engine block. My Impala w/348 (originally had a turboglide) now has a powerglide with a 3-bolt starter mounted on the engine block. I'm doing the switch on my 1960 Nomad.

I think I'll need to change the cooling lines, shift linkage, flywheel? driveshaft?, starter?
I thought there might be a bulletin describing the process since it was a common thing to do back in the day.

Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
59cheviac 
Contributor
Posts: 701

Loc: the sunshine state
Reg: 10-31-03
05-31-18 04:00 AM - Post#2735461    
    In response to Chevyfan60

The flywheels are different, and I think the starters may be as well.



 
DonSSDD 
Silver Supporting Member
Posts: 6816
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
05-31-18 04:40 PM - Post#2735527    
    In response to 59cheviac

The starter on the ironglide bolts to the spacer, same starter as the manual tranny cars where it bolts to the bell housing.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
05-31-18 10:32 PM - Post#2735544    
    In response to Chevyfan60

  • Chevyfan60 Said:
....I'm curious about the starter - the spacer has a place for a horizontally mounted starter but with the turboglide in it now, it has a 3-bolt starter mounted directly to the engine block. My Impala w/348 (originally had a turboglide) now has a powerglide with a 3-bolt starter mounted on the engine block. I'm doing the switch on my 1960 Nomad.

I think I'll need to change the cooling lines, shift linkage, flywheel? driveshaft?, starter?
I thought there might be a bulletin describing the process since it was a common thing to do back in the day.


Chevy made the starter situation more complicated than it needs to be. The TG has an aluminum case similar to the later automatics with no provision for mounting a starter on it. It must be used with a block-mounted starter.

The stock PG for your 348 would have had a cast iron case. A cast iron adapter ring about 1-1/2" thick is installed between the transmission and the engine block. The PG starter (horizontal bolts) mounts on this adapter. A block-mounted starter can't be used unless you cut away part of the adapter for clearance. I would recommend against doing this.

Some builders have installed an aluminum case PG on the 348, and then a block-mounted starter must be used. Note that the starter drilling on 348 blocks (and also 57-61 283s) will accept only a 168 tooth starter (staggered mounting bolts).

If your Impala has a block-mounted starter, it likely has an aluminum PG instead of cast iron. Is that correct?

An X-frame TG is shorter than an X-frame PG (either aluminum or CI), so the front driveshaft must be shortened or replaced if you are converting from a TG to a PG or any other Chevy automatic.

Besides the driveshaft and starter, you will need to replace the flexplate and modify or replace the shift linkage, throttle valve linkage, and cooling lines. If you want the installation to look stock, you could also replace the selector quadrant, but this isn't functionally necessary

A fair number of TGs were replaced under warranty with PGs, so it is very possible that a service bulletin exists for this and maybe even a parts kit, but I have never seen any offered for sale.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
06-01-18 09:39 PM - Post#2735654    
    In response to raycow

Thanks for the great information Ray. This starter thing has me wondering... it does have a 3-bolt (vertically) mounted starter and a cast iron powerglide. I know this for sure because I removed it and replaced the transmission seals on it many years ago - and that sucker is heavy! Now I'm curious if someone cut the spacer in order to fit the starter. I'll have to take a closer look.

Attachment: 002__2_.jpg (820 KB) 12 View(s)




Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-02-18 05:39 PM - Post#2735714    
    In response to Chevyfan60

That certainly looks like a correct TG starter. It's the only one I know of with a bolt pattern which lets you use all 3 bolts on a 348 or pre-62 283.

I will be very interested to hear what you find if or when you unbolt that starter again. Try to see if any material was removed from either the PG adapter or the starter nose.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
06-03-18 04:55 PM - Post#2735834    
    In response to raycow

  • raycow Said:
That certainly looks like a correct TG starter. It's the only one I know of with a bolt pattern which lets you use all 3 bolts on a 348 or pre-62 283.

I will be very interested to hear what you find if or when you unbolt that starter again. Try to see if any material was removed from either the PG adapter or the starter nose.

Ray



Yes, I'm curious now... I'll let you know...
Now I understand why I've always had problems talking to auto parts people about this engine and starter


Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


Edited by Chevyfan60 on 06-03-18 04:56 PM. Reason for edit: No reason given.

 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
06-18-18 08:03 PM - Post#2737443    
    In response to Chevyfan60

I got the turboglide out of my Nomad. Looking at the powerglide and starter, I'm confused about the bolts. The starter and the trans spacer have three bolt holes.
Bottom hole on starter is not threaded and is threaded on the spacer - It uses a bolt through the starter into the spacer.
Middle hole on the starter is not threaded. On the spacer is a threaded bolt that passes through the starter - a nut on the starter side will be used here.
Top hole on the starter is threaded and the top hole on the spacer is threaded? A bolt cannot be inserted in either the starter nor the spacer side (not enough clearance on the starter side and the hole is not threaded all the way through on the spacer side).
So... how do I attach the top bolt???

Attachment: 101_4757.JPG (2.44 MB) 2 View(s)




Attachment: 101_4759.JPG (2.62 MB) 3 View(s)




Attachment: 101_4760.JPG (2.37 MB) 2 View(s)




Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-19-18 02:26 AM - Post#2737476    
    In response to Chevyfan60

It looks like you have the wrong year starter for your PG adapter or vice-versa.

There are two starter designs, 55-56 and 57-62. On 55-56 the solenoid bolts to the starter case. On 57-62 the solenoid bolts to the drive housing. The top hole was changed on 57-62 because the later drive housing design doesn't leave enough clearance for a bolt to be inserted from the front.

I would say you have a 57-62 starter and a 55-56 adapter. Replace either one and you should be good to go. One other possibility might be to drill the top hole in the adapter all the way through and install a bolt from the rear. Before you try this, check if the bolt head will have any interference issues on the rear side of the adapter. The stock 57-62 adapter is spot faced on the rear side for the bolt head.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
06-19-18 10:18 AM - Post#2737528    
    In response to raycow

Ok, that explains it. Thanks Ray!

Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-19-18 11:03 AM - Post#2737538    
    In response to Chevyfan60

Michael, you are very welcome. Please let us know what you end up doing and how it works out.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Gene_Schneider 
Ultra Senior Member
Posts: 12146
Gene_Schneider
Loc: Wisconsin..USA
Reg: 09-27-02
06-19-18 02:59 PM - Post#2737564    
    In response to raycow

Just change the rear end frame on the starter using one for a iron Power Glide.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-19-18 03:35 PM - Post#2737570    
    In response to Gene_Schneider

Michael already has a starter for an iron PG, but it's a 57-62 type and his PG adapter is 55-56. He can't install a 55-56 drive housing on this starter because the case isn't drilled and tapped for the 55-56 solenoid mounting bolts and the lead going into the case won't attach to the 55-56 solenoid.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
06-25-18 10:27 AM - Post#2738139    
    In response to raycow

  • raycow Said:


I would say you have a 57-62 starter and a 55-56 adapter. Replace either one and you should be good to go. One other possibility might be to drill the top hole in the adapter all the way through and install a bolt from the rear. Before you try this, check if the bolt head will have any interference issues on the rear side of the adapter. The stock 57-62 adapter is spot faced on the rear side for the bolt head.

Ray



Thanks Ray, it looks like drilling out the top hole in the adapter plate will work!

Another question: should I put lock washers on the bolts that mount the adapter to the engine or the ones that mount the transmission to the adapter? I didn't get any bolts when I bought the transmission and associated parts...


Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-25-18 02:22 PM - Post#2738156    
    In response to Chevyfan60

I like lockwashers on everything, so I have them on mine. Unfortunately, I can't remember if they were used on the factory assembly.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
beagrizzly 
"9th Year" Gold Supporting Member
Posts: 1863
beagrizzly
Age: 68
Loc: south texas
Reg: 08-04-12
06-26-18 12:51 PM - Post#2738235    
    In response to Chevyfan60

Chevyfan,
Is it feasible to put a stud in the top hole of the adapter? You would have to start the nut with the starter pulled back a little to make room to put it on.

I think I would try before I spent big bucks trying to locate a correct adapter.

Griff

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-26-18 02:59 PM - Post#2738244    
    In response to beagrizzly

Yes, that would probably work, but then you would have to drill out the threads in the starter. I can't see how this would be any better than drilling out the threads in the adapter.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
beagrizzly 
"9th Year" Gold Supporting Member
Posts: 1863
beagrizzly
Age: 68
Loc: south texas
Reg: 08-04-12
06-27-18 09:16 AM - Post#2738305    
    In response to raycow

Ray,

You are again, The MAN!

I just looked at the pics again. Didn't see the threads in the starter hole, and it has been a very long time since I laid under my 55, in the snow, changing the starter.

griff

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
06-27-18 01:06 PM - Post#2738315    
    In response to beagrizzly

A stock 55-56 V-8 starter doesn't have any threads in the top mounting hole. The solenoid and drive housing design used in those years allows a bolt to be inserted from the front. All that changed in 57.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
07-12-18 03:56 PM - Post#2739790    
    In response to raycow

  • raycow Said:
A stock 55-56 V-8 starter doesn't have any threads in the top mounting holes. The solenoid and drive housing design used in those years allows a bolt to be inserted from the front. All that changed in 57. Ray



I drilled out the threads in the adapter ring and spot-faced the hole. It looks like it's going to work just fine!

Attachment: 101_4774.JPG (2.3 MB) 0 View(s)


PG adapter


Attachment: 101_4776.JPG (1.98 MB) 1 View(s)


PG and starter


Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
07-12-18 04:15 PM - Post#2739793    
    In response to Chevyfan60

Here's a comparison of the PG and TG components that I've identified. The gear indicators on the steering column are also different.


Attachment: TG_and_PG_comparison.JPG (46.83 KB) 3 View(s)




Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
raycow 
Honored Member
Posts: 27658
raycow
Loc: San Francisco, CA
Reg: 11-26-02
07-14-18 06:15 PM - Post#2739986    
    In response to Chevyfan60

It looks like you are off to a good start. Please keep us posted on how the rest of the swap goes.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
07-17-18 01:51 PM - Post#2740310    
    In response to raycow

Here's a few pics of the TG linkage Ozzie was interested in...

Attachment: 101_4768.JPG (2.12 MB) 0 View(s)


TG brackets


Attachment: 101_4782.JPG (2.46 MB) 3 View(s)


PG on top, TG on bottom.


Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 944
Chevyfan60
Loc: Longmont, CO
Reg: 04-19-01
07-19-18 07:32 PM - Post#2740580    
    In response to Chevyfan60

Okay, another question. I realized the kick down linkages are different however, I think the PG trans I got may have been out of a car that had a 283 engine - my Nomad has a 348. So, the linkages may be the same for both transmissions and different due to the engine. Based on a quick look at my Impala (348/Powerglide) the top linkage looks a little bit longer than what was on the Nomad (348/Turboglide). Maybe they're all different?

Attachment: 101_4777.JPG (2.08 MB) 1 View(s)


Left set came with PG. Right set from TG.


Michael
1960 Impala 348, 1960 El Camino (x2), 1960 Nomad, 1992 S-10 Blazer, 2001 GMC Sierra 2500HD,
2002 Trailblazer


 
This Forum is Sponsored by
1-800-IMPALAS  *  www.impalas.com
Visit Impala Bob's forum on ChevyTalk
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

1134 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.164 seconds.   Total Queries: 19   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:40 AM
Top