TH400 driveshaft question

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TH400 driveshaft question

Postby jgblanchard » Mon Sep 08, 2008 6:31 pm

I just picked up a rebuilt th400, it's driveshaft yoke bolts on to the output shaft, and it had the short output shaft on it. Can I use a regular slip yoke (not bolt on) and a one piece driveshaft, or am I going to have to get a 2 piece driveshaft made?
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Re: TH400 driveshaft question

Postby adam_chevyss » Wed Sep 17, 2008 4:44 am

i think you have to use the bolt on style yoke because of the shaft length but I wouldn't use a 2 piece drive shaft just get one made the right length in a one piece design.
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Re: TH400 driveshaft question

Postby Rickracer » Wed Sep 17, 2008 5:54 am

adam_chevyss wrote:i think you have to use the bolt on style yoke because of the shaft length but I wouldn't use a 2 piece drive shaft just get one made the right length in a one piece design.

The bolt on yoke requires a slip yoke somewhere in the shaft. You can use a slip yoke on the trans, just make sure it's the long one. I've seen guys cut the threads off the shaft and use a short yoke, but I wouldn't recommend that. 8)
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'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 8.0 in the 1/8th, 12.75@106 mph in the 1/4, gonna spray it soon... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: TH400 driveshaft question

Postby jgblanchard » Thu Sep 25, 2008 6:01 pm

I only have the short output on the trans (4" I think). Do they make a slip yoke for the short one?
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Re: TH400 driveshaft question

Postby Rickracer » Thu Sep 25, 2008 6:33 pm

How long is your slip yoke? 4" should be long enough.... 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 8.0 in the 1/8th, 12.75@106 mph in the 1/4, gonna spray it soon... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: TH400 driveshaft question

Postby gstanfield » Thu Sep 25, 2008 6:54 pm

Could you please tell my wife that a 4" slip yoke is long enough, she doesn't believe me.

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Re: TH400 driveshaft question

Postby Rickracer » Thu Sep 25, 2008 11:34 pm

Just have her read my post, and tell her that I never lie*, :wink: 8)


*Although I may be mistaken or misunderstood now and then, 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 8.0 in the 1/8th, 12.75@106 mph in the 1/4, gonna spray it soon... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: TH400 driveshaft question

Postby stick » Sun Feb 07, 2010 3:27 am

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