Trans yoke
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
The TH400 uses an output yoke with 32 splines; the M20 used a 27 spline yoke. The early Borg Warner T-10 4-speeds, the Muncies through about 1969(?), the PowerGlides, and the TH350s all had the 27 spline outputs; the TH400, the later Muncies and the BW Super T10s (~1975+) all used the 32 spline output.
However, prior to the early 70s, the yoke's u-joint size was a 1310; later yokes used the 1330 u-joint with a wider spread.
AFAIK, the drive shaft lengths were all the same, but early drive shafts had ends taking 1310 u-joints; later drive shafts had ends taking 1330 u-joints. In the event you need to match an early 32-spline yoke with a late drive shaft, Spicer makes a nice conversion u-joint which connects the 1310 size yoke with a 1330 size drive shaft.
However, prior to the early 70s, the yoke's u-joint size was a 1310; later yokes used the 1330 u-joint with a wider spread.
AFAIK, the drive shaft lengths were all the same, but early drive shafts had ends taking 1310 u-joints; later drive shafts had ends taking 1330 u-joints. In the event you need to match an early 32-spline yoke with a late drive shaft, Spicer makes a nice conversion u-joint which connects the 1310 size yoke with a 1330 size drive shaft.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
The TH400 uses an output yoke with 32 splines; the M20 used a 27 spline yoke. The early Borg Warner T-10 4-speeds, the Muncies through about 1969(?), the PowerGlides, and the TH350s all had the 27 spline outputs; the TH400, the later Muncies and the BW Super T10s (~1975+) all used the 32 spline output.
However, prior to the early 70s, the yoke's u-joint size was a 1310; later yokes used the 1330 u-joint with a wider spread.
AFAIK, the drive shaft lengths were all the same, but early drive shafts had ends taking 1310 u-joints; later drive shafts had ends taking 1330 u-joints. In the event you need to match an early 32-spline yoke with a late drive shaft, Spicer makes a nice conversion u-joint which connects the 1310 size yoke with a 1330 size drive shaft.
However, prior to the early 70s, the yoke's u-joint size was a 1310; later yokes used the 1330 u-joint with a wider spread.
AFAIK, the drive shaft lengths were all the same, but early drive shafts had ends taking 1310 u-joints; later drive shafts had ends taking 1330 u-joints. In the event you need to match an early 32-spline yoke with a late drive shaft, Spicer makes a nice conversion u-joint which connects the 1310 size yoke with a 1330 size drive shaft.
with everything but the lengths part. There are different lengths for a TH400 and a 4-speed shaft. TH350 and 4-speed are very close in length.
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
You are correct! I checked my old '71 Corvette parts book - there are two drive shafts, with the "except TH(400)" longer. The book gave an overall length for the "except TH", but only gave the tubing length for the TH400 shaft!
