Turbo 400 trans question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 08-17-2004, 10:59 AM

I have a turbo 400 trans I pulled from a 68 Caprice many moons ago. I will be putting together a 68 swb project with a 396 I have and want to use a turbo 400 with it.

Can anyone tell me if the trans from the Caprice is the same as a truck trans? Or are there differences in the length, linkage hookup, or other concerns/problems I would have in using this trans in the truck.

Once again thanks for any info or suggestions.....this board is the greatest.

Scott

**fine69** · 08-17-2004, 11:15 AM

Same thing

JimKshortstep4x4 · 08-17-2004, 12:58 PM

The 68 Caprice should have the same length transmission as the trucks, (short tailshaft). I believe they use with the large yoke but you may want to check that, (the earlier transmissions had the same output shaft spline but a smaller diameter OD).

Jim

Robert1970C20rstbukt · 08-17-2004, 03:01 PM

It'll bolt right up. I have a TH400 from a '67 Caprice in my truck, the only mod it needed was to have the driveshaft cut because the th400 is longer than the old th350.

**ScottH** · 08-17-2004, 09:01 PM

Thanks guys!

Tx Firefighter · 08-17-2004, 10:58 PM

You may run into a tiny snag with the yoke. Some very early Th400s used a smaller yoke than later ones used. I bought an original 68 model TH400 from board member Superchevy, and it still used the small type of yoke. My trans guy converted it to the normal one when he rebuilt it for me. After like 69 or so, they all used the same bigger yoke.

**ScottH** · 08-18-2004, 09:46 AM

I kept the yoke when I pulled the trans so I would have it. If I remember correctly it was a large one (but then I wouldn't bet on my memory). One odd thing about the yoke, it had a large metal ring around the entire yoke, I'm assuming a counter weight of some sort, but never saw one before. Definitely looks OEM.

Thanks again for everyone's help.

Scott

08-17-2004, 10:59 AM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Turbo 400 trans question I have a turbo 400 trans I pulled from a 68 Caprice many moons ago. I will be putting together a 68 swb project with a 396 I have and want to use a turbo 400 with it. Can anyone tell me if the trans from the Caprice is the same as a truck trans? Or are there differences in the length, linkage hookup, or other concerns/problems I would have in using this trans in the truck. Once again thanks for any info or suggestions.....this board is the greatest. Scott

08-17-2004, 11:15 AM	#2
fine69 Senior Member Join Date: Dec 1999 Location: Urbana,Ohio,USA Posts: 4,618	Same thing __________________ 2008 Chevy HHR 1/2 panel. 1949 Chevy Panel truck(just sittin, waiting) Board member #6

08-17-2004, 03:01 PM	#4
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	It'll bolt right up. I have a TH400 from a '67 Caprice in my truck, the only mod it needed was to have the driveshaft cut because the th400 is longer than the old th350. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-17-2004, 10:58 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	You may run into a tiny snag with the yoke. Some very early Th400s used a smaller yoke than later ones used. I bought an original 68 model TH400 from board member Superchevy, and it still used the small type of yoke. My trans guy converted it to the normal one when he rebuilt it for me. After like 69 or so, they all used the same bigger yoke. __________________ I'm on the Instagram- @Gearhead_Kevin

08-17-2004, 12:58 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The 68 Caprice should have the same length transmission as the trucks, (short tailshaft). I believe they use with the large yoke but you may want to check that, (the earlier transmissions had the same output shaft spline but a smaller diameter OD). Jim

08-17-2004, 09:01 PM	#5
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Thanks guys!

08-18-2004, 09:46 AM	#7
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	I kept the yoke when I pulled the trans so I would have it. If I remember correctly it was a large one (but then I wouldn't bet on my memory). One odd thing about the yoke, it had a large metal ring around the entire yoke, I'm assuming a counter weight of some sort, but never saw one before. Definitely looks OEM. Thanks again for everyone's help. Scott



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