Driveshaft length ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Custom10 · 07-01-2003, 10:37 PM

My '67 LWB currently has a V8 sitting in the straight six spot. Has a long tail TH350 behind it. I'm putting a disc brake crossmember under it and I want to move the motor up to the the V8 mounting holes. So what motor tranny setup do I need to look for that will have the right length driveshaft. Andrew

*Piston* · 07-01-2003, 11:15 PM

You've got the right setup now. Just move that engine up to the V8 holes and have a 65" driveshaft built.

I run a V8, TH350 long tail and a 65" shaft. You'll want to relieve the crossmember at the bottom just a bit. Otherwise it will hit when the truck is raised on a lift.

68CST327 · 07-01-2003, 11:30 PM

What's the difference in driveshaft length going from a TH400 to a TH350? I also don't know the difference between long tail and short, so if someone could help me out here... I'm thinking about swapping out the TH400 to a TH350 for some extra horsepower, but I don't know all the details. Thanks

71Custom10 · 07-02-2003, 12:32 AM

I want to get a two piece from a junkyard truck and was wondering what to tranny and motor setup it would need to have or had in it to be the right lenght for what I need, since these trucks came with short tail shafts in them. Would a 3spd be the right lenght? Andrew

Blue_71 · 07-02-2003, 12:40 AM

3 speed and short tail 350 are the same length from what ive heard

71Custom10 · 07-02-2003, 05:55 PM

TTT

Mixup · 07-02-2003, 06:29 PM

There are 3 length turbo 350"s 6", 9" and 12" tailshaft. The 6" is the same size as most 3&4 speeds and the 200R4 trans.The 9" is the same size as a 700R4. The 12" is used in pickups and full size Gm cars.

68CST327 · 07-02-2003, 07:25 PM

Quote:

Originally posted by Mixup
There are 3 length turbo 350"s 6", 9" and 12" tailshaft. The 6" is the same size as most 3&4 speeds and the 200R4 trans.The 9" is the same size as a 700R4. The 12" is used in pickups and full size Gm cars.

Do any of the 3 lenghts of the TH350 tailshafts equal the overall length of a TH400? I mean, could I swap in a TH350 in place of my 400 without getting a new driveshaft? Or is this not possible?

Mixup · 07-03-2003, 10:32 AM

It's close but you still might need driveshaft work. The short tail 350 overall length is 27 5/8 and the 400 is 28 1/4.

jimfulco · 07-04-2003, 02:16 AM

a T400 with 4" tail is about the same length as a T350 with 6" tail

07-01-2003, 10:37 PM	#1
71Custom10 Registered User Join Date: Feb 2000 Location: Temple, Texas Posts: 325	Driveshaft length ? My '67 LWB currently has a V8 sitting in the straight six spot. Has a long tail TH350 behind it. I'm putting a disc brake crossmember under it and I want to move the motor up to the the V8 mounting holes. So what motor tranny setup do I need to look for that will have the right length driveshaft. Andrew __________________ '67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service

07-02-2003, 12:32 AM	#4
71Custom10 Registered User Join Date: Feb 2000 Location: Temple, Texas Posts: 325	I want to get a two piece from a junkyard truck and was wondering what to tranny and motor setup it would need to have or had in it to be the right lenght for what I need, since these trucks came with short tail shafts in them. Would a 3spd be the right lenght? Andrew __________________ '67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service

07-02-2003, 05:55 PM	#6
71Custom10 Registered User Join Date: Feb 2000 Location: Temple, Texas Posts: 325	TTT __________________ '67 Chevy Longbed Fleetside - Daily Driver(For Now) '72 Cheyene Longbed Fleetside-Daily Driver Best Towing Service

07-02-2003, 06:29 PM	#7
Mixup Registered User Join Date: Jan 2002 Location: Henderson, NV Posts: 358	There are 3 length turbo 350"s 6", 9" and 12" tailshaft. The 6" is the same size as most 3&4 speeds and the 200R4 trans.The 9" is the same size as a 700R4. The 12" is used in pickups and full size Gm cars. __________________ 1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350

07-03-2003, 10:32 AM	#9
Mixup Registered User Join Date: Jan 2002 Location: Henderson, NV Posts: 358	It's close but you still might need driveshaft work. The short tail 350 overall length is 27 5/8 and the 400 is 28 1/4. __________________ 1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350

07-01-2003, 11:15 PM	#2
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	You've got the right setup now. Just move that engine up to the V8 holes and have a 65" driveshaft built. I run a V8, TH350 long tail and a 65" shaft. You'll want to relieve the crossmember at the bottom just a bit. Otherwise it will hit when the truck is raised on a lift.

07-01-2003, 11:30 PM	#3
68CST327 Registered User Join Date: Aug 2002 Location: USA Posts: 443	What's the difference in driveshaft length going from a TH400 to a TH350? I also don't know the difference between long tail and short, so if someone could help me out here... I'm thinking about swapping out the TH400 to a TH350 for some extra horsepower, but I don't know all the details. Thanks

07-04-2003, 02:16 AM	#10
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	a T400 with 4" tail is about the same length as a T350 with 6" tail



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