TH400 Driveshaft question - Team Camaro Tech
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post #1 of 4 (permalink) Old Jan 6th, 01, 06:45 PM Thread Starter
Join Date: Mar 1999
Location: albany ny usa
Posts: 24

Another quick one. Swapping a 350/saginaw to a 454/th400. The 454 came out of a 78 3/4 ton. Is there some way to use the bigger yoke on my exsisting drive shaft? Can my drive shaft even be used?

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post #2 of 4 (permalink) Old Jan 7th, 01, 05:10 AM
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Join Date: Oct 1998
Location: Ramsey, MN, USA
Posts: 76

You can use the bigger yoke and your driveshaft, but you may need to shorten it. If you do, take it to a good driveline shop and have them change the weld yoke on the shaft to a 3R style so you can use a standard u-joint. Otherwise you'll be stuck with a conversion joint which is almost twice the cost and not readily available at all parts stores. Your existing shaft most likely has 1310 joints with outside snap rings and the larger yoke for the TH400 has either the stock plastic injection retaining the cups, or if it's been replaced has inside snap rings. To make a joint work between the two you need a 1310 to 3R conversion joint, or have the end of your shaft changed to the 3R (best IMO).

70 & 1/2 RS
SB406 & M20 4spd
9" rear

70 Malibu 350/TH400

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[This message has been edited by Scooter (edited 01-07-2001).]
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post #3 of 4 (permalink) Old Jan 7th, 01, 07:03 AM Thread Starter
Join Date: Mar 1999
Location: albany ny usa
Posts: 24

Thx Scooter. If I decided to go with the conversion U joint , where can I buy it?
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post #4 of 4 (permalink) Old Jan 14th, 01, 03:38 PM Thread Starter
Join Date: Mar 1999
Location: albany ny usa
Posts: 24

UPDATE. The driveshaft was too long. I will be looking to shorten it , finding a replacement. Any ideas where I could find the right drive shaft?

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