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Username Post: Turboglide to Powerglide swap        (Topic#351341)
Chevyfan60 
"15th Year" Silver Supporting Member
Posts: 934
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


 
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DonSSDD 
Silver Supporting Member
Posts: 6788
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: 934
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: 696

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
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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: 27485
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 
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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.

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


 
raycow 
Honored Member
Posts: 27485
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: 934
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: 934
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???

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


 
raycow 
Honored Member
Posts: 27485
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. Only the top hole changed on 57-62 because the later drive housing design does not 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: 934
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: 27485
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: 12131

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: 27485
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.


 
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