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Username Post: Powerglide to Turbo350        (Topic#362407)
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
08-31-20 12:10 PM - Post#2802418    

Just bought a 55 chevy belair, 327 with powerglide trans mission. The tranny seems good, but thinking down the road switching to 350 turbo. How involved would it be? drive shaft? transmission mounts?

If your not the lead dog the view never changes


 


56sedandelivery 
Gold Supporting Member
Posts: 5916
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
08-31-20 04:56 PM - Post#2802440    
    In response to bolake

Does the 327 have an aluminum Powerglide bolted to it? If so, I think I'd leave it the way it is. BUT, if you still want 3 forward gears, it's a fairly easy swap. You may or may not need a new slip yoke, depending on what Powerglide the car currently has. Do you still have the column shifter? That can be made to work also with the kits sold for the shift indicator and the rod to connect to the transmission. Does the 327 have the stock front mounts, or aftermarket side mount kit? Stock front mounts, then go with an aftermarket mid mount kit and a rear transmission cross member. If the engine is side mounted already, then add a rear cross member. As you can see, we need a little more information to adequately answer your question about what may be needed. If you do go with a TH350, then get the "short" one; it'll be the same length as a stock Powerglide, and you won't have to change your driveshaft; possibly just the slip yoke. I am Butch/56sedandelivery.





 
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
09-01-20 04:42 AM - Post#2802454    
    In response to 56sedandelivery

It has the cast transmission housing with stock front motor mounts. The transmission seems to work ok, just the gear indicator in the dash seems to need the indicator rod or something, it doesn't move. Thanks for the information.

If your not the lead dog the view never changes


 
56sedandelivery 
Gold Supporting Member
Posts: 5916
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
09-01-20 06:50 AM - Post#2802462    
    In response to bolake

You'd want the "short" TH-350 trans, you'll need the 27 spline (fine spline) slip yoke, side mount the trans AND use a rear cross-member/mount. OR, side mount the engine and use a rear cross-member/mount (better way). Use the shifter linkage kit and the shift indicator display/detent (you can repair what's wrong with it at that time also). TH-350's use a cable kick-down, and there are a fe2w aftermarket kits for that also. You'll need a different flex-plate and a block mounted starter motor also. I am Butch/56sedandelivery.




Edited by 56sedandelivery on 09-01-20 06:51 AM. Reason for edit: No reason given.

 
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
09-01-20 11:17 AM - Post#2802494    
    In response to 56sedandelivery

Thanks , I'm sure there is aftermarket cross members and everything else needed. Haven't researched it but does the entire column have to come apart to repair the indicator rod. Looks like there's a bottom cover on the column that comes off.

If your not the lead dog the view never changes


 
56sedandelivery 
Gold Supporting Member
Posts: 5916
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
09-02-20 04:06 PM - Post#2802572    
    In response to bolake

There's a cover that goes from the column up to the speedometer cluster; that cover pops off and you should be able to access the rod linkage, as small as it is. I am Butch/56sedandelivery.




 
57tim 
Valued Contributor
Posts: 3108
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
09-02-20 05:38 PM - Post#2802583    
    In response to 56sedandelivery

I had the same setup in a 57 as you do. JMHO but I wouldn't waste my money on a 3 speed. I went with a 700r4 and the old 327 really liked the upgrade. Besides the much lower 1st gear. if you go on the highway the rpm's will go down about 1000 depending on your rear gear ratio.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
09-03-20 11:25 AM - Post#2802651    
    In response to 56sedandelivery

Found a video of gauge removal, showed what you described, took it off can see where the linkage hooks to pin in column was unsure if you had to disassemble column more. thanks, have new one ordered, mine was gone.

If your not the lead dog the view never changes


 
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
09-03-20 11:26 AM - Post#2802652    
    In response to 57tim

Was it more of change over then 350 , shorten drive shaft, etc?

If your not the lead dog the view never changes


 
57tim 
Valued Contributor
Posts: 3108
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
09-07-20 05:45 AM - Post#2802928    
    In response to bolake

Yes on shortening the drive shaft and a different yoke.
I also installed a different shift indicator in the dash. I bought an extension for the speedometer cable but you may need that for a 350 but I am not sure. Some replace the whole cable with a longer one. You will need a TV cable kit. I recommend the Bowtieoverdrives setup. Its not cheap but very good.



57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


Edited by 57tim on 09-07-20 05:49 AM. Reason for edit: No reason given.

 
bolake 
Poster
Posts: 66

Age: 74
Loc: Northern MN
Reg: 09-05-17
09-07-20 08:42 AM - Post#2802933    
    In response to 57tim

Thanks for information, will check it out

If your not the lead dog the view never changes


 
old ripper 
Poster
Posts: 50
old ripper
Loc: Bottom left hand corner o...
Reg: 06-21-12
01-30-21 05:24 AM - Post#2813246    
    In response to 57tim

Hi 57 Tim,
Just wondering, which TH700R you went with?
I've got a good 283 (1957) so I gather I can bolt up the later gearboxes and planning to go TH700R
Thanks :-)

I used to know everything once...but I'm not young anymore


 
57tim 
Valued Contributor
Posts: 3108
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
02-01-21 01:33 PM - Post#2813417    
    In response to old ripper

I bought it from a local transmission shop and he sourced the transmission so I am not sure but I believe it came from 2wd pickup. Its been a long time ago and I don't remember what year but I do know it was from a later year rather then an earlier year 700r4.

Hopefully someone with a better memory can give the years that were the best transplants.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 


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