Powerglide with 16 spline output shaft

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Powerglide with 16 spline output shaft

Postby Qweasy » Fri Jan 08, 2016 12:30 am

Hi all! I'm new here so forgive me if I post questions that have already been answered. I'm working on swapping a 327 with an early powerglide. I'm using the kit from TransDapt for the swap.

Problem #1: can I swap the tailshaft out of the original th350 transmission into my powerglide? Or what vehicle would have the 16 spline slip yoke?

Problem #2: I'm having difficulty with the left engine mount interfering with the steering box. Has anyone used this kit from transdapt?

Problem #3: is A/C possible?

Problem #4: rear end...............

Edit: the car is a 1973 chevy Vega with factory ac
Last edited by Qweasy on Fri Jan 08, 2016 12:21 pm, edited 1 time in total.
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Re: Powerglide with 16 spline output shaft

Postby Smiley » Fri Jan 08, 2016 4:57 am

early 1960's Chevy's used the 16 spline yoke.
is your original TH350 still usable ?

What year and model is your car ?
does it have manual or power steering ?
does it have factory AC ?
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Re: Powerglide with 16 spline output shaft

Postby spencerforhire » Fri Jan 08, 2016 7:21 am

Tailshafts housings are not interchangeable between Powerglide and TH-350. When you say "early Powerglide" are you referring to the cast iron case 50's ones? I presume not. All aluminum 'Glides are actually "later" style. Not the best trans choice for a street car, as they require a loose converter and steep rear gears to feel even the least bit "sporty".
Virtually indestructible and the #1 choice by a wide margin at the drag strip(I won't use anything else), but no fun for just cruisin'.
Also, you didn't tell us what year H-body you're building; makes it hard to make recommendations for a rear end. If you asked about swapping tailshafts, I would assume it's a 76-up torque arm car.
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
03 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
07 Saturn Ion Redline project
and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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1972 Chevrolet Vega Hatchback

Re: Powerglide with 16 spline output shaft

Postby Qweasy » Fri Jan 08, 2016 12:25 pm

Smiley wrote:early 1960's Chevy's used the 16 spline yoke.
is your original TH350 still usable ?

What year and model is your car ?
does it have manual or power steering ?
does it have factory AC ?



1973 chevy vega, manual steering, factory ac.
Yes the original th350 is usable. The reason I'm not using it is it has a different bell housing.
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Re: Powerglide with 16 spline output shaft

Postby Qweasy » Fri Jan 08, 2016 12:31 pm

spencerforhire wrote:Tailshafts housings are not interchangeable between Powerglide and TH-350. When you say "early Powerglide" are you referring to the cast iron case 50's ones? I presume not. All aluminum 'Glides are actually "later" style. Not the best trans choice for a street car, as they require a loose converter and steep rear gears to feel even the least bit "sporty".
Virtually indestructible and the #1 choice by a wide margin at the drag strip(I won't use anything else), but no fun for just cruisin'.
Also, you didn't tell us what year H-body you're building; makes it hard to make recommendations for a rear end. If you asked about swapping tailshafts, I would assume it's a 76-up torque arm car.


Yes it's a 61 or 62 aluminum powerglide. Again it's a 73 vega. It will be a drag car but I want to be able to comfortably drive to the track. I won't be daily driving it.
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Re: Powerglide with 16 spline output shaft

Postby Smiley » Fri Jan 08, 2016 7:30 pm

For a 73
You can get a bolt in 9 inch Ford rear end from Autoweld Chassis
if it is going to be a race car you may want to go ahead and backhalve it.
Vintage Air is the best option for AC, the whole unit goes behind the firewall.
You should have a new driveshaft made with HD u-joints and balanced for what ever trans you end up with.
I would use a TH350 if any street driving is in the plan.
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