Drive Shaft - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 02-24-2008, 10:36 PM

OK I got the transmission done and was just checking everything out good under the truck. The rear u-joint has a little slipping in it. Is this normal or is it time to replace, I shot a couple of pumps of grease into it. It's not tight in the peice that holds it to the rear end it moves up & down.
What do you think?

**WorkinLonghorn** · 02-24-2008, 10:44 PM

I think you need to tighten the U-bolts to specs and wiggle the shaft and if there is ANY play at all,replace the u-joint.

Andy4639 · 02-25-2008, 01:19 AM

Thanks that's what I thought. I torqued them back down but it is still moving slightly.

Longhorn Man · 02-25-2008, 05:45 AM

is the u-joint moving in the caps, or are the caps moving in the diff yoke?

Andy4639 · 02-25-2008, 07:05 AM

Caps moving in the diff yoke. Well the whole thing moves. The two caps that attach to the rear end slip up and down the ones on the drive shaft don't move.

**WorkinLonghorn** · 02-25-2008, 07:10 AM

Then you might have the wrong U-joint or maybe the u-bolts are crap but there def.should not be the slightest movement there.

Longhorn Man · 02-25-2008, 07:18 AM

exactly. I would start with replacement straps/u-bolts and bolts.

02-24-2008, 10:36 PM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Drive Shaft OK I got the transmission done and was just checking everything out good under the truck. The rear u-joint has a little slipping in it. Is this normal or is it time to replace, I shot a couple of pumps of grease into it. It's not tight in the peice that holds it to the rear end it moves up & down. What do you think? __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-24-2008, 10:44 PM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,873	Re: Drive Shaft I think you need to tighten the U-bolts to specs and wiggle the shaft and if there is ANY play at all,replace the u-joint. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

02-25-2008, 01:19 AM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Drive Shaft Thanks that's what I thought. I torqued them back down but it is still moving slightly. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-25-2008, 05:45 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Drive Shaft is the u-joint moving in the caps, or are the caps moving in the diff yoke?

02-25-2008, 07:05 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Drive Shaft Caps moving in the diff yoke. Well the whole thing moves. The two caps that attach to the rear end slip up and down the ones on the drive shaft don't move. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-25-2008, 07:10 AM	#6
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,873	Re: Drive Shaft Then you might have the wrong U-joint or maybe the u-bolts are crap but there def.should not be the slightest movement there. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

02-25-2008, 07:18 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Drive Shaft exactly. I would start with replacement straps/u-bolts and bolts.



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