Torque spec - Driveshaft needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BubbaGreen · 06-08-2005, 05:58 PM

Hey guys,
Can some one tell me what the proper torque spec is for the endcap to U-Joint where the driveshaft connects to the differential. If it makes a differerence, its a stock 12-bolt. Thanks!!!

Longhorn Man · 06-08-2005, 07:20 PM

Bubba, as silly as it sounds, get them as tight as you possibly can with the box end of the wrench. IIRC it is a 5/16 head, so you aren't going to get 150 ft pounds on it.
I always use a threadlocking compound, and if they look too old or any damage at all...replace them with new.

As far as real torque figures, I really couldn't tel you, but I'm sure some one can though. (asuming you can get a torque wrench in there)

BubbaGreen · 06-08-2005, 07:59 PM

Well that is what I was thinking...get them as tight as possible, but then reading about U-Joints, the mfg are suggesting them to be torqued properly to prevent distorting the cups, causing premature failure. Thats why I would like to "correct" torque spec...ie, 20ft-lbs or 120ft-lbs

ratfreak888 · 06-08-2005, 08:31 PM

i once read 17 ft./lbs. but i always do it exactly like longhorn said

fastwillie 696969 · 06-08-2005, 08:48 PM

torque them done until you FART

Longhorn Man · 06-08-2005, 09:17 PM

bubba, that is interesting, and it does make sence.
However, i still say torque them untill the wrench is about to round off the bolt.
if you do find proper specs, please let us know.

*Randy70C-10* · 06-08-2005, 09:30 PM

I always tighten the crap out of them, been doing it for over 20 years.

Dean23 · 06-08-2005, 11:21 PM

this is the spec for a 98 gmc 1500...id imagine the 67-72 trucks isnt much different

Rear Axle Yoke Retainer Bolt C/K 1,2,3 Except C3500HD
20 N·m
15 lb ft

purple gas · 06-09-2005, 07:51 AM

I read somewhere once that when engeneers design things with torque requirments the size of the fastener head is a pretty good clue as to how tight it needs to be. Small wrenches fit small bolts, small wrenches have shorter handles than larger wrenches, the length of the handle determins how much leverage or torque you can apply. So, if you use a wrench and not a socket and tighten it till you fart you'll likely be pretty close wether it be a 3/8 or 1 1/2 bolt. Sort of a built in torque limiter. There are some situations where exact torque is critical and this just sin't good enough, but it's a good guide.. Then again if you live on pickled eggs, beans & cabbage and beer you might fart just bending over.

06-08-2005, 05:58 PM	#1
BubbaGreen Senior Member Join Date: Mar 2001 Location: Cedar Park, TX Posts: 686	Torque spec - Driveshaft needed Hey guys, Can some one tell me what the proper torque spec is for the endcap to U-Joint where the driveshaft connects to the differential. If it makes a differerence, its a stock 12-bolt. Thanks!!! __________________ 71 Chevy C-10 SWB Fleetside RamJet-350/4L60e & Compushift/3.73Posi See it at www.prismnet.com/~grzanich

06-08-2005, 07:59 PM	#3
BubbaGreen Senior Member Join Date: Mar 2001 Location: Cedar Park, TX Posts: 686	Well that is what I was thinking...get them as tight as possible, but then reading about U-Joints, the mfg are suggesting them to be torqued properly to prevent distorting the cups, causing premature failure. Thats why I would like to "correct" torque spec...ie, 20ft-lbs or 120ft-lbs __________________ 71 Chevy C-10 SWB Fleetside RamJet-350/4L60e & Compushift/3.73Posi See it at www.prismnet.com/~grzanich

06-08-2005, 08:48 PM	#5
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	torque them done until you FART __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

06-08-2005, 11:21 PM	#8
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	this is the spec for a 98 gmc 1500...id imagine the 67-72 trucks isnt much different Rear Axle Yoke Retainer Bolt C/K 1,2,3 Except C3500HD 20 N·m 15 lb ft __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

06-09-2005, 07:51 AM	#9
purple gas Registered User Join Date: Oct 2004 Location: saskatoon, planet earth Posts: 686	I read somewhere once that when engeneers design things with torque requirments the size of the fastener head is a pretty good clue as to how tight it needs to be. Small wrenches fit small bolts, small wrenches have shorter handles than larger wrenches, the length of the handle determins how much leverage or torque you can apply. So, if you use a wrench and not a socket and tighten it till you fart you'll likely be pretty close wether it be a 3/8 or 1 1/2 bolt. Sort of a built in torque limiter. There are some situations where exact torque is critical and this just sin't good enough, but it's a good guide.. Then again if you live on pickled eggs, beans & cabbage and beer you might fart just bending over. __________________ I got a bench seat baby, you don't have to sit over there.

06-08-2005, 07:20 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Bubba, as silly as it sounds, get them as tight as you possibly can with the box end of the wrench. IIRC it is a 5/16 head, so you aren't going to get 150 ft pounds on it. I always use a threadlocking compound, and if they look too old or any damage at all...replace them with new. As far as real torque figures, I really couldn't tel you, but I'm sure some one can though. (asuming you can get a torque wrench in there)

06-08-2005, 08:31 PM	#4
ratfreak888 Registered User Join Date: Jun 2003 Posts: 104	i once read 17 ft./lbs. but i always do it exactly like longhorn said

06-08-2005, 09:17 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	bubba, that is interesting, and it does make sence. However, i still say torque them untill the wrench is about to round off the bolt. if you do find proper specs, please let us know.

06-08-2005, 09:30 PM	#7
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	I always tighten the crap out of them, been doing it for over 20 years.



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