Rear Diff ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

soba_03 · 03-26-2008, 09:33 PM

OK so I'm out laying on the ground trying to put the hitch on my truck and I noticed that the rearend where the rear bars attach to the differential, YES right where the U bolt go through. It seems that there is a gap and it look like this on both sided. Rear of the rear trailing arm between the differential axel and trailing arm in the back looks like it's loose there is about 1/4" gap it's not pulled up tight. front side of the U bolt looks pulled down tight but the back is up a bit. Obviously it's a coil spring rearend 1/2 ton. Tried to tighten with cheater bar and ratchet and U boly nuts won't move at all.

Any thoughts? Looks like might have been moving a bit as well cause where the shackel and the Ubolt on the differential meet got a shiny spot on the UBolt and I know that can't be good.

TIA
Soba

Andy4639 · 03-26-2008, 09:48 PM

You need to take it some place that can put a air gun on it and undo it. It sounds as if whoever tightened it up did one side first then tried the back side and left it thinking it was tight.
U-Bolts need to be took up together so it pulls up tight.

chris71 · 03-26-2008, 09:55 PM

worst case senario, cut the ubolt out and get a new one with new nuts, might as well do both sides if you do one

03-26-2008, 09:33 PM	#1
soba_03 Registered User Join Date: Sep 2007 Location: Fairdale, Kentucky Posts: 560	Rear Diff ? OK so I'm out laying on the ground trying to put the hitch on my truck and I noticed that the rearend where the rear bars attach to the differential, YES right where the U bolt go through. It seems that there is a gap and it look like this on both sided. Rear of the rear trailing arm between the differential axel and trailing arm in the back looks like it's loose there is about 1/4" gap it's not pulled up tight. front side of the U bolt looks pulled down tight but the back is up a bit. Obviously it's a coil spring rearend 1/2 ton. Tried to tighten with cheater bar and ratchet and U boly nuts won't move at all. Any thoughts? Looks like might have been moving a bit as well cause where the shackel and the Ubolt on the differential meet got a shiny spot on the UBolt and I know that can't be good. TIA Soba

03-26-2008, 09:48 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Rear Diff ? You need to take it some place that can put a air gun on it and undo it. It sounds as if whoever tightened it up did one side first then tried the back side and left it thinking it was tight. U-Bolts need to be took up together so it pulls up tight. __________________ 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.

03-26-2008, 09:55 PM	#3
chris71 Registered User Join Date: Oct 2007 Location: Sykesville MD Posts: 357	Re: Rear Diff ? worst case senario, cut the ubolt out and get a new one with new nuts, might as well do both sides if you do one __________________ '55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife



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