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Username Post: My 66 SS Automatic to Manual conversion        (Topic#363423)
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-27-20 08:03 AM - Post#2808723    

I'm converting my 66 SS from a Automatic transmission to a Manual 4 speed. And I thought
I would document the process.

Current car Spec:

-1966 Impala SS
-Engine: 454 Big block, 4bbl, Hooker headers, 430hp to the crank
-Trans: 700r4 with burnt up 3/4 gears
-Has buckets and center console with gauges
-Factory Power steering, power brakes upgraded c3 font disks
-Car had PG and 327 to start with, which I believe I can use the driveshaft and crossmember from.
-Rear diff is a 10 bolt 3.08ratio
-running 25.5" tires all around

I know a TKO600 or TKX would be a better choice but I really want to start with a Muncie wide ratio 4 speed and if I don't care for that move to the 5 speed in the future.





What I have read is needed for the Swap:

? Transmission (picked a m20 wide ratio)
? Shifter and Muncie or Hurst linkage
? Pedal set from a parts car
? Reverse light bracket, switch, and activating rod
? Transmission to bellhousing bolts
? Clutch disk, pressure plate, and throwout
? Bellhousing and bellhousing to block boltsbearing
? Bellhousing dust shield and 4 attaching bolts (hex head 1/4" x 20, 5/16" long)
? Throwout bearing fork (straight type) and dust boot,
? Input shaft pilot bushing or roller bearing (into rear of crankshaft)
? Z-bar
? Z-bar to fork rod and retaining spring
? Clutch pedal to Z-bar rod, return spring, swivel joint, and spring clip
? Frame mounted Z-bar bracket (must be welded on)
? Z-bar ball stud (purchase from GM - repop Chinese ones break off)
? Flywheel 454(168 tooth external balance) and clutch.
? trans hump??? Not sure if this is needed with a console car?
4 speed console.
-Console rubber shift boot
-Passenger side speedo cable and grommet.


This is my winter project I'll post as I acquire and pull parts.




Ted


Edited by 427SS65 on 12-06-20 01:36 PM. Reason for edit: Remove selling reference

 


Double Aught 
Contributor
Posts: 359

Loc: SW America
Reg: 09-28-11
11-27-20 08:29 AM - Post#2808726    
    In response to brickwhite

subscribing. Perhaps, once you have successfully finished the swap, make this thread a sticky.



 
bigred65 39
Contributor
Posts: 306
bigred65
Age: 39
Loc: Kenmore WA
Reg: 03-18-13
11-27-20 10:22 AM - Post#2808740    
    In response to brickwhite

Don't forget about the 4 speed console you need to find it maybe the most expensive part of the conversion. Also the wire harness is different for a 4 speed, under dash, console and 4 speed reverse light. Also you will need the 4 speed floor hump and to remove and patch up your automatic floor hump. Have fun and good luck, just take your time and do it right the first time and you will be happy with the results.

Brandon



1965 Impala SS 396 4spd
1966 Impala SS convert 4spd
1973 Corvette 4spd
1973 Firebird Formula 4spd
1959 Corvette FI 4spd will restore it someday!!!


 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-27-20 02:13 PM - Post#2808769    
    In response to bigred65

I have the 4 speed console, Anyone have details on the hump and what needs to be changed?

Ted


 
mjc1 
Senior Member
Posts: 1734
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
11-27-20 02:58 PM - Post#2808775    
    In response to brickwhite

It's a worthwhile conversion Ted. Just did it on a 65 Six/PG/ bench car.
Perhaps you might find a few things here that might apply to your conversion,

4 speed conversion on a 65 Bench car

1965 Laurentian post, 1967 Grande Parisienne 4DR HT
My Flickr page



 
craig32 
Frequent Contributor
Posts: 1366

Age: 59
Loc: PA
Reg: 08-05-07
11-27-20 03:14 PM - Post#2808778    
    In response to brickwhite

  • brickwhite Said:
I have the 4 speed console, Anyone have details on the hump and what needs to be changed?


Be glad you're not going the other way. My car was a column automatic, switched to floor (with console - poorly done) when I redid the interior I got the 'auto console bracket kit'. It has a 4" high bracket that's supposed to go on the front of the gauge-less console. Look at yours in the picture and tell me how a 4" bracket will fit??? The assembly manual and 'standard kit' show a bracket anout an inch and a half high. I even found another vendor with the same oversized bracket, so apparently NOBODY knows what they're doing. I posted about it on here a week ago, and nobody had any solutions. Good luck!

66 Impala (almost done!)
56 Stepside shortbed
55 Bel Air sedan
81 Corvette
02 Monte Carlo (bought new)


 
66cayne 
Valued Contributor
Posts: 2954
66cayne
Reg: 08-06-08
11-27-20 03:30 PM - Post#2808779    
    In response to brickwhite

You have a good starter list. I did something similar, coverted from a 3 on the tree to a 4 speed. Then next project ditched the 10 bolt for a 12 bolt. Good luck with yours



 
65acadian 
Member
Posts: 252
65acadian
Loc: Manitoba, Canada
Reg: 08-15-04
11-27-20 10:17 PM - Post#2808809    
    In response to brickwhite

  • brickwhite Said:
I have the 4 speed console, Anyone have details on the hump and what needs to be changed?



The only repro hump I see on the market is this one.


https://www.ebay.com/itm/66-67-Chevrolet-I mpala-Sh...

I was the only person who had reviewed it, and I gave it a very well deserved negative review but somehow they have managed to remove my review. Even though they did that, you can still read my thoughts and detail on it here.

https://canadianponcho.activeboard.com/t64450086/4...

It's better than nothing but out of the box it fits like crap.





 
66cayne 
Valued Contributor
Posts: 2954
66cayne
Reg: 08-06-08
11-28-20 08:13 AM - Post#2808834    
    In response to 65acadian

yes, it fits like crap. But after an hour of hammer and plier work it should fit fine. Once it is fitted it will also serve as a good template for the hole that needs to be cut which is approximately and inch inside the edges of the hump. When you make the hole cut it will appear to be much larger than really needed to fit the shifter. Don't freak, ts suppose to be that way. It is also wise to have the Muncie in place prior to making the cut to be sure the hole is properly located. Its different than the automatic.



 
japete92 
"7th Year" Silver Supporting Member
Posts: 1678
japete92
Loc: No. Virginia
Reg: 01-18-13
11-28-20 08:58 AM - Post#2808838    
    In response to 66cayne

  • 66cayne Said:
yes, it fits like crap. But after an hour of hammer and plier work it should fit fine. Once it is fitted it will also serve as a good template for the hole that needs to be cut which is approximately and inch inside the edges of the hump. When you make the hole cut it will appear to be much larger than really needed to fit the shifter. Don't freak, ts suppose to be that way. It is also wise to have the Muncie in place prior to making the cut to be sure the hole is properly located. Its different than the automatic.




Concur the 'hole' cut needs to be as large as the 'hump' (basically to the 'bottom' of the tunnel). If not cut that large, a 'pocket' is created into the tunnel (at the shifter location) that can entrap water splashed from underneath.

Give the splashed water a place to go.

And, a gasket will help seal the interface between the 'hump' and the tunnel. Make one if necessary.

These are NOT for your car but show my intent:

https://show-cars.com/product/4345

https://show-cars.com/product/4343

Pete



Edited by japete92 on 11-28-20 08:59 AM. Reason for edit: No reason given.

 
bigred65 39
Contributor
Posts: 306
bigred65
Age: 39
Loc: Kenmore WA
Reg: 03-18-13
11-28-20 10:14 AM - Post#2808844    
    In response to brickwhite

I hope you got the console boot with the console, they are also super hard to find. It's the lower boot that screws to the floor and rises up through the console. They were reproduced for awhile but I haven't seen them for a couple of years now.

Brandon


1965 Impala SS 396 4spd
1966 Impala SS convert 4spd
1973 Corvette 4spd
1973 Firebird Formula 4spd
1959 Corvette FI 4spd will restore it someday!!!


 
mjc1 
Senior Member
Posts: 1734
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
11-28-20 10:40 AM - Post#2808845    
    In response to bigred65

One other thing to add to your list:
A passenger side speedo cable and firewall grommet.

1965 Laurentian post, 1967 Grande Parisienne 4DR HT
My Flickr page



 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-28-20 07:38 PM - Post#2808912    
    In response to mjc1

Classic still sells this...

https://www.classicindustries.com/product/1966/che...




Ted


Edited by brickwhite on 11-28-20 07:42 PM. Reason for edit: No reason given.

 
bigred65 39
Contributor
Posts: 306
bigred65
Age: 39
Loc: Kenmore WA
Reg: 03-18-13
11-28-20 07:56 PM - Post#2808913    
    In response to brickwhite

That is the top piece, but you need the lower piece that screws to the floor and goes up inside the console to the top piece. Otherwise the water and other road debris goes right inside the console. Also needed is the steel retaining ring that holds the boot to the floor.

Brandon

1965 Impala SS 396 4spd
1966 Impala SS convert 4spd
1973 Corvette 4spd
1973 Firebird Formula 4spd
1959 Corvette FI 4spd will restore it someday!!!


 
Rick Dorion 
"7th Year" Gold Supporting Member
Posts: 327
Rick Dorion
Loc: Accord, NY
Reg: 09-21-12
11-29-20 03:31 AM - Post#2808926    
    In response to mjc1

I was able to reroute my speedo cable to the passenger side without any issues. The manual tranny conversion totally transformed my car.

1967 Belair - LM7 5.3, Autogear M23Z, Global West, C5 brakes and rims.


 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-29-20 07:46 AM - Post#2808945    
    In response to bigred65

  • bigred65 Said:
That is the top piece, but you need the lower piece that screws to the floor and goes up inside the console to the top piece. Otherwise the water and other road debris goes right inside the console. Also needed is the steel retaining ring that holds the boot to the floor.

Brandon



Do you have any Pictures of the floor ring?



#7? I'll probably have to make one....


Ted


Edited by brickwhite on 11-29-20 08:23 AM. Reason for edit: No reason given.

 
66cayne 
Valued Contributor
Posts: 2954
66cayne
Reg: 08-06-08
11-29-20 07:49 AM - Post#2808946    
    In response to brickwhite

here something you need...

https://www.ebay.com/itm/1965-65-1966-66-C hevy-Imp...



 
bigred65 39
Contributor
Posts: 306
bigred65
Age: 39
Loc: Kenmore WA
Reg: 03-18-13
11-29-20 09:04 AM - Post#2808956    
    In response to brickwhite

As for the ring somehow I didn't take any pictures of it when I had my car apart. I should have made a template of it,so i could make one for one of my other cars. I have the boot off my other car, I wonder if i can make a cardboard temp off of it?

Brandon

1965 Impala SS 396 4spd
1966 Impala SS convert 4spd
1973 Corvette 4spd
1973 Firebird Formula 4spd
1959 Corvette FI 4spd will restore it someday!!!


 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-29-20 09:41 AM - Post#2808958    
    In response to 66cayne

  • 66cayne Said:


Starting to gather parts.... Pedals, Muncie shifter, zbar etc..

















Ted


Edited by brickwhite on 12-08-20 06:52 AM. Reason for edit: No reason given.

 
65acadian 
Member
Posts: 252
65acadian
Loc: Manitoba, Canada
Reg: 08-15-04
11-29-20 06:34 PM - Post#2809013    
    In response to brickwhite

Great start!





Edited by 65acadian on 11-29-20 06:35 PM. Reason for edit: No reason given.

 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
11-30-20 10:21 AM - Post#2809062    
    In response to 65acadian

started doing research on the 4 speed hump.

Looks as if even with the Auto console I will need to cut and patch a hump for a Muncie 4 speed console.

What it would (67/not mine) currently under my auto console:




What it will need to look like to fit:



How to get there:









Ted


Edited by brickwhite on 11-30-20 10:21 AM. Reason for edit: No reason given.

 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
12-02-20 12:36 PM - Post#2809229    
    In response to brickwhite

Long clutch fork found.

I think I found the correct clutch fork and pivots...but the bell housing is the smaller one, will need to get the bigger one.



















Ted


 
A White Sport Coupe 
"10th Year" Silver Supporting Member
Posts: 458
A White Sport Coupe
Reg: 08-19-10
12-02-20 02:37 PM - Post#2809245    
    In response to brickwhite

Hello,

These repop boots don't last very long at all. I even reamed out the hole a bit to make it slide over the rod but it didn't help much. Can't even get one summer of driving out of them.

Attachment: DSCN3327.jpg (341.4 KB) 27 View(s)




Bob


 
bigred65 39
Contributor
Posts: 306
bigred65
Age: 39
Loc: Kenmore WA
Reg: 03-18-13
12-02-20 03:14 PM - Post#2809247    
    In response to brickwhite

Ted

Yes that looks like the right fork with the correct tall bellhousing pivot stud. Fortunately the 621 bellhousing was used on alot of cars from 67 on into the middle or late 70's.
What clutch are you planning on running?

Brandon

1965 Impala SS 396 4spd
1966 Impala SS convert 4spd
1973 Corvette 4spd
1973 Firebird Formula 4spd
1959 Corvette FI 4spd will restore it someday!!!


 
brickwhite 
Contributor
Posts: 212
brickwhite
Loc: Missouri
Reg: 09-05-19
12-03-20 05:18 AM - Post#2809287    
    In response to bigred65

Brandon,

Not sure on a clutch, 11" of some type. RAM, mclod, or LUK.

Any Suggestions? 454 with 425hp and 3.08 rear gears for now 25.5" street tires. Just a driver.



Ted


Edited by brickwhite on 12-03-20 06:12 AM. Reason for edit: No reason given.

 
Johnny468 
"13th Year" Silver Supporting Member
Posts: 846
Johnny468
Loc: Richmond, Va.
Reg: 10-24-08
12-03-20 09:18 AM - Post#2809301    
    In response to A White Sport Coupe

I switched to this type of clutch rod boot which is much more durable.

https://www.summitracing.com/parts/oer-3973089

Johnny

1965 Impala SS
505/4-speed/3.90


 
A White Sport Coupe 
"10th Year" Silver Supporting Member
Posts: 458
A White Sport Coupe
Reg: 08-19-10
12-03-20 05:29 PM - Post#2809322    
    In response to Johnny468

Thanks Johnny.

Bob


 
66cayne 
Valued Contributor
Posts: 2954
66cayne
Reg: 08-06-08
12-05-20 10:42 AM - Post#2809404    
    In response to brickwhite

you'll thank me later for this tip. Cut an access notch on the bottom of the drivers side inner fender well just across from the bell crank mounting bracket ( the bracket that is welded to the frame. This will allow access to the stud and nut (from behind the tire and through the newly cut notch) that holds the bell crank in place. With out this access getting the nut on or off of the bellcrank stud is a pain in the a_ _.



Edited by 66cayne on 12-05-20 10:43 AM. Reason for edit: No reason given.

 
59fins 
Member #212 "20th Year" Gold Supporting Member
Posts: 2450
59fins
Age: 61
Loc: Surprise Az USA
Reg: 04-07-00
12-07-20 03:52 PM - Post#2809579    
    In response to 66cayne

I did this conversion back in late 12-into 2013, had not had a 4 speed since high school, late 70's, and it wasn't a conversion, it was fun!

The 66 is pretty close to the 67, I put a console in a 67 that was out of a 66, it was an automatic, but the front wedge was different, but since you have gauges hopefully that won't be an issue.

Since the upper boot is not on the shifter you will most likely will need that wire to release the shifter into reverse.
Also you will need a pilot bearing, don't skimp.
The old console brackets to floor are the same.
The lower boot is hard to come by, I got the "hump" that in the pics above, cause the guy I got it from sent those pics to me as well, and it worked great, just took me a little time to get my bearings on where exactly to place it, however I guess the guy does not make them anymore.
Since I was short on room, I took the doors off, cause since I had the dash apart, I put power windows in, repaired the floor where heater core had leaked, painted the dash, found a nos dash pad, insulated the floor and new carpet.
As far as the z bar mounting, I mocked it up and had an assembly guide (for measurements) and photos, and welded it on.
The "restored" console I got came site unseen, no carpet on the bottom, and the upper/ front molding frame where the 4 speed emblem is, the frame had corrosion on it, he put the inserts on anyways, since fixed... I put a 65 M20 in it with the speedo coming out the drivers side, the "325" had been rebuilt and and the main shaft 3/4 inch to 1 inch.



Attachment: 1_A_12-9-2012__.JPG (907.34 KB) 26 View(s)




Attachment: 1C_2-10-2013__done_c.JPG (357.29 KB) 21 View(s)




Attachment: 1B_1-12-13_boot_work_2.JPG (423.2 KB) 29 View(s)




Attachment: 1_A_Parts_1-27-13_upper_sifter_boot_on_shifter.JPG (333.24 KB) 24 View(s)




Attachment: 1_A_Parts_1-26-13_cable_inside_shifter_for_back_up_release.JPG (234.91 KB) 26 View(s)




Bill H.
67 SS




 
59fins 
Member #212 "20th Year" Gold Supporting Member
Posts: 2450
59fins
Age: 61
Loc: Surprise Az USA
Reg: 04-07-00
12-07-20 05:01 PM - Post#2809585    
    In response to 59fins

I went to Big Block last winter into summer, this time I detailed under the hood and got the correct "020" M20 trans with tail housing coming out of passengers side so the cable would go across firewall as it should. The 325 I could of gotten a different tail shaft but I did not realize that it had been updated with the 1" shaft.
You will need the longer speedo cable possibly and the small brackets to hold it to the firewall (3 I think), and the lower cover for the flywheel cover.
Good luck with the conversion, it is not real hard, just don't rush it.


Attachment: 1_A_Parts_12-9-2012__NOS_flywheel_cover_.JPG (860.28 KB) 22 View(s)




Attachment: example_of_clutch_z_bar_mountinng.JPG (97.05 KB) 27 View(s)




Attachment: 1B_1-15-13_mock_up.JPG (394.99 KB) 28 View(s)


Mocked up before install


Attachment: 1_A_Parts_12-9-2012__upper___lwr_boot_and_ring_.JPG (818.05 KB) 23 View(s)




Attachment: 2-1-2013_3_.JPG (458.48 KB) 31 View(s)


I did not have the hump in the right place, so I needed to butt weld a few pieces back in. but this pic does show the contour of a floor shift with console.


Bill H.
67 SS




 


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