Tail shaft vs yoke - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hx16457 · 02-08-2013, 10:55 PM

Tell me;
Does anyone know how much of the yoke has to reach inside the tail shaft to get a good seal and contact enough of the actual tail shaft to get good surface area contact and good torque?
Note: I am in need of this information as it is compared to a,
350 V8, mounted in the front mounted position, with a th350, matched with a 1972 dif. With 3.73gears...
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Idaho64GMC · 02-08-2013, 11:09 PM

from what I've read there should be less than an inch of the yoke exposed, so bottom the yoke out and pull it out to 3/4 or an inch exposed and you should be good

Tx Firefighter · 02-09-2013, 07:33 AM

Ideally, the yoke should be bottomed, then pulled out 3/4 of an inch. Again, that's ideal and what my driveshaft shop uses for building one. You'll still be fine if it's 1/2 or even up near 1 inch though.

Hx16457 · 02-09-2013, 07:54 AM

Okay thx for the replays.

I need a longer shaft, then. Mine is pulled out approx. 2 or more inches from the tail shaft...
It sounds like I need one at least 1.25" longer to get me closer to the tail piece.
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Hx16457 · 02-09-2013, 01:23 PM

Anybody else running a similar set-up, with a one piece that could tell me the donor they used?
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Hx16457 · 02-09-2013, 08:15 PM

Bump.... Anyone?
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61K10 · 02-10-2013, 01:25 PM

they do make different length yoke's i think. speedway catalog? might just work.

Tx Firefighter · 02-10-2013, 01:44 PM

No one is going to be able to give any recommendation on a donor driveshaft without knowing what length transmission your th350 (there are 3 different length th350 trans) is and whether your truck is long or short wheelbase.
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tincan1966 · 02-10-2013, 01:50 PM

I noted in the posting that the engine is in the forward mounting location? Why not move it back to where a V8 normally mounts and solve the problem?

Are you running a 2 piece drive shaft? If so, then the engagement of the yoke isn't nearly as critical,as long as you have about 75% engaged, because you have no risk of it bottoming out during suspension compression.
Excuse me if I am missing something.

Hx16457 · 02-10-2013, 07:14 PM

Well I am hearing another issue, it's the rear end!
1. About how much does it cost to rebuild a 72' rear end?
2. Can't you buy a kit for the rear end and use a more modern one, say from a later 75'-80's? I thought there was a kit you can buy and weld it on to match our coil rear??
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Oh and it's a LWB w/ what was called a short tail th350 trans?
One piece drive shaft is what I am running currently.

I had not been driving it much due to no exhaust! But now I have exhaust and I can hear the little noises! Thx

Big Fenders · 02-10-2013, 09:49 PM

I neede a longer yoke for my project [th350] and a yoke for a 700r4 was what I used..
Bob

02-08-2013, 10:55 PM	#1
Hx16457 Registered User Join Date: Sep 2012 Location: Lawton Oklahoma Posts: 308	Tail shaft vs yoke Tell me; Does anyone know how much of the yoke has to reach inside the tail shaft to get a good seal and contact enough of the actual tail shaft to get good surface area contact and good torque? Note: I am in need of this information as it is compared to a, 350 V8, mounted in the front mounted position, with a th350, matched with a 1972 dif. With 3.73gears... Posted via Mobile Device __________________ People who make excuses didn't want to do it in the first place! http://s1326.photobucket.com/albums/...cpZZ1QQtppZZ16

02-08-2013, 11:09 PM	#2
Idaho64GMC Registered User Join Date: Feb 2013 Location: Twin Falls, Idaho Posts: 70	Re: Tail shaft vs yoke from what I've read there should be less than an inch of the yoke exposed, so bottom the yoke out and pull it out to 3/4 or an inch exposed and you should be good

02-09-2013, 07:33 AM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Tail shaft vs yoke Ideally, the yoke should be bottomed, then pulled out 3/4 of an inch. Again, that's ideal and what my driveshaft shop uses for building one. You'll still be fine if it's 1/2 or even up near 1 inch though.

02-09-2013, 07:54 AM	#4
Hx16457 Registered User Join Date: Sep 2012 Location: Lawton Oklahoma Posts: 308	Re: Tail shaft vs yoke Okay thx for the replays. I need a longer shaft, then. Mine is pulled out approx. 2 or more inches from the tail shaft... It sounds like I need one at least 1.25" longer to get me closer to the tail piece. Posted via Mobile Device __________________ People who make excuses didn't want to do it in the first place! http://s1326.photobucket.com/albums/...cpZZ1QQtppZZ16

02-09-2013, 01:23 PM	#5
Hx16457 Registered User Join Date: Sep 2012 Location: Lawton Oklahoma Posts: 308	Re: Tail shaft vs yoke Anybody else running a similar set-up, with a one piece that could tell me the donor they used? Posted via Mobile Device __________________ People who make excuses didn't want to do it in the first place! http://s1326.photobucket.com/albums/...cpZZ1QQtppZZ16

02-09-2013, 08:15 PM	#6
Hx16457 Registered User Join Date: Sep 2012 Location: Lawton Oklahoma Posts: 308	Re: Tail shaft vs yoke Bump.... Anyone? Posted via Mobile Device __________________ People who make excuses didn't want to do it in the first place! http://s1326.photobucket.com/albums/...cpZZ1QQtppZZ16

02-10-2013, 01:25 PM	#7
61K10 Registered User Join Date: Feb 2012 Location: pleasant valley--placerville ca Posts: 3,039	Re: Tail shaft vs yoke they do make different length yoke's i think. speedway catalog? might just work. __________________ 1961 chevy K10 my build is------------61K10 build

02-10-2013, 01:44 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Tail shaft vs yoke No one is going to be able to give any recommendation on a donor driveshaft without knowing what length transmission your th350 (there are 3 different length th350 trans) is and whether your truck is long or short wheelbase. Posted via Mobile Device

02-10-2013, 01:50 PM	#9
tincan1966 Registered User Join Date: Oct 2010 Location: Independence,KS Posts: 1,477	Re: Tail shaft vs yoke I noted in the posting that the engine is in the forward mounting location? Why not move it back to where a V8 normally mounts and solve the problem? Are you running a 2 piece drive shaft? If so, then the engagement of the yoke isn't nearly as critical,as long as you have about 75% engaged, because you have no risk of it bottoming out during suspension compression. Excuse me if I am missing something. Last edited by tincan1966; 02-10-2013 at 01:53 PM. Reason: added text.

02-10-2013, 07:14 PM	#10
Hx16457 Registered User Join Date: Sep 2012 Location: Lawton Oklahoma Posts: 308	Re: Tail shaft vs yoke Well I am hearing another issue, it's the rear end! 1. About how much does it cost to rebuild a 72' rear end? 2. Can't you buy a kit for the rear end and use a more modern one, say from a later 75'-80's? I thought there was a kit you can buy and weld it on to match our coil rear?? Posted via Mobile Device Oh and it's a LWB w/ what was called a short tail th350 trans? One piece drive shaft is what I am running currently. I had not been driving it much due to no exhaust! But now I have exhaust and I can hear the little noises! Thx __________________ People who make excuses didn't want to do it in the first place! http://s1326.photobucket.com/albums/...cpZZ1QQtppZZ16 Last edited by Hx16457; 02-10-2013 at 07:20 PM.

02-10-2013, 09:49 PM	#11
Big Fenders Registered User Join Date: Mar 2008 Location: Tucson Arizona Posts: 264	Re: Tail shaft vs yoke I neede a longer yoke for my project [th350] and a yoke for a 700r4 was what I used.. Bob

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