1960 Powerglide output shaft and planetary gear

[Bruno V.]

Dear friends,
I am converting a 1960 passenger powerglide into a Corvette powerglide. I have found the correct tailshaft housing already. Now, I am looking for the right planetary carrier + output shaft (Corvette Powerglide output shaft are longer than passenger cars'). I have been told this is 3758670 G.M. part. Could anybody confirm this and indicate where I could find this part ? Thanks !

[Roy B.]

Re: 1960 Powerglide output shaft and planetary gear

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=180369026731

55 to 61 Corvette are all the same "output"

[Bruno V.]

Re: 1960 Powerglide output shaft and planetary gear

Thanks Roy !
The Ebay Corvette Powerglide is for pick-up only and it is much too far away for me to go there and get it (I am living oversee ...). I believe I can adapt my 1960 passenger Powerglide into the Corvette application by changing the output shaft + planetary gear only (in addition to the tailshaft housing), but I have the hardest time identifying the right part number and the right place where to order it (I have already the correct tailshaft housing with the 3 bossings to fix the shifter). Am I correct and do you have any advise ?
Any info will be very welcome !
Bruno

[Edward M.]

Re: 1960 Powerglide output shaft and planetary gear

Bruno;

I think Roy is saying that, with the exception of the tail housing and the torque converter, the passenger car and Corvette powerglides are the same.

Is that true Roy? It is what I have been told many times.

[Roy B.]

Re: 1960 Powerglide output shaft and planetary gear

Bruno;

I think Roy is saying that, with the exception of the tail housing and the torque converter, the passenger car and Corvette powerglides are the same.

Is that true Roy? It is what I have been told many times.

Yes on cast iron PG's

[Roy B.]

Re: 1960 Powerglide output shaft and planetary gear

Thanks Roy !
The Ebay Corvette Powerglide is for pick-up only and it is much too far away for me to go there and get it (I am living oversee ...). I believe I can adapt my 1960 passenger Powerglide into the Corvette application by changing the output shaft + planetary gear only (in addition to the tailshaft housing), but I have the hardest time identifying the right part number and the right place where to order it (I have already the correct tailshaft housing with the 3 bossings to fix the shifter). Am I correct and do you have any advise ?
Any info will be very welcome !
Bruno

NCRS driveline a guys has a add for PG parts. Check him out.

[Bruce B.]

Re: 1960 Powerglide output shaft and planetary gear

Bruno,
I just ordered some parts for my 57 Powerglide from David Edwards of Autotran in Mass.
Great source of information, excellent prices and just a nice guy.
Call at 781 449-2065 or email at www.autotran.us
He has an advertisement in Driveline.

[David E.]

Re: 1960 Powerglide output shaft and planetary gear

Bruno,
This old thread, https://www.forums.ncrs.org/showthre...beard&uid=2372 says the guy who sold the 1953-54 PG conversion kits years ago is no longer with us.

Bruce Brusten,
Thanks for the recommendation and compliment. Dave

[David E.]

Re: 1960 Powerglide output shaft and planetary gear

Roy,
I always see where you say that the 1955-61 output planetary and output shaft are the same for both the car and the Corvette. But, all of my parts books and also the Hollander Interchange Manual say the part numbers are different.
The car planetary number is listed as 3743843 and the Corvette is listed as 3754636 (original number was 3743844). There must be some difference for GM to have listed two separate numbers at the same time. They must/might be interchangeable and fit with no problem(s) but the Hollander manual doesn't say or mention this. Have you, or anyone you know, actually been able to compare these two different part numbers?
Thanks, Dave

[Bruce B.]

Re: 1960 Powerglide output shaft and planetary gear

I recently had a cast iron Powerglide rebuilt and along with buying some new parts we used some donor parts from a 1958 passenger car PG.
Some parts are interchangeable and some are not.
As an example, the drum for the hi-low clutch is longer on the car transmission by .030" to .050 and it will keep the center case from mateing up to the front case ( or bellhoousing).
So be careful, some parts will not interchange.

[Roy B.]

Re: 1960 Powerglide output shaft and planetary gear

It's the length of the out put shaft , some cars are longer (station wagon ) you must look to see if the length is correct for your Corvette. hope this helped !

[David E.]

Re: 1960 Powerglide output shaft and planetary gear

I just measured a brand new (was still in its unopened box) original OEM #3743843, a car (not Corvette) planetary and shaft assembly today. From the washer face to the end of the shaft, it measured 14 13/32". Can anyone measure, what they know to be an original Corvette 1955-57 planetary and post the results?
Thanks, Dave
PS: Bruce, The 1953-57 clutch drums are the same but are different than the 1958-61 drums. It was the year of the drum you tried to use, a 1958 that was the problem, not a car/Corvette transmission difference.

[Bruno V.]

Re: 1960 Powerglide output shaft and planetary gear

I just measured a brand new (was still in its unopened box) original OEM #3743843, a car (not Corvette) planetary and shaft assembly today. From the washer face to the end of the shaft, it measured 14 13/32". Can anyone measure, what they know to be an original Corvette 1955-57 planetary and post the results?
Thanks, Dave
PS: Bruce, The 1953-57 clutch drums are the same but are different than the 1958-61 drums. It was the year of the drum you tried to use, a 1958 that was the problem, not a car/Corvette transmission difference.

Thanks Dave !
As the Corvette tailshatf housing (With the 3 bossings) is longer than a car (not Corvette), I am expecting the Corvette planetary and shaft assembly to be longer as well. Looking forward to getting the measurement of an original Corvette planetary and shaft assembly to get a confirmation or ???
Best regards
Bruno

[Edward M.]

Re: 1960 Powerglide output shaft and planetary gear

Thanks Dave !
As the Corvette tailshatf housing (With the 3 bossings) is longer than a car (not Corvette), I am expecting the Corvette planetary and shaft assembly to be longer as well. Looking forward to getting the measurement of an original Corvette planetary and shaft assembly to get a confirmation or ???
Best regards
Bruno

I am not sure this is correct. I just went out to the garage and measured my Corvette (with the three mounting bosses) tail housing and my passenger car tail housing. They measure the same, a hair over 7 inches from transmission mating surface to end of the tail housing. I have used the Corvette tail housing on the passenger car powerglide with no issues.

I cannot speak to the shaft assembly dimensions.

[David E.]

Re: 1960 Powerglide output shaft and planetary gear

I have a part number 3782027 (casting #3782028), which is the later (and replacement for earlier) Corvette extension housing with the 3 bosses. As Edward says, it is a shade over "7 inches from transmission mating surface to end of the tail housing", I measured 7 1/32". So, if the extension housing lengths are the same, the output shafts should probably be the same length also. So if this is true, what possible difference can there be between the two part numbers? Has or can anybody compare the two side by side?
Thanks, Dave