U Jount Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMCor70Chevy · 10-25-2007, 10:41 AM

I have a question on the U joints for my 69 (I have 1 long shaft with no carrier). Will I feel play/slop in the joint if it is bad? And if there is no play does that mean it is good?

The reason I ask is that I was experiencing what sounded like a semi's engine brake engaging when I let of the throttle. There was clunking a little as well and a vibration when I let of the throttle slightly. But when I took the shaft off last night the joints look pretty new (I have only had the truck a couple of months) and there is no play or slop.

**truckdude239** · 10-25-2007, 11:01 AM

go right to the join and try and shake it if any play replace them if no play good to go if the got greece fittings greecce them real good

**WorkinLonghorn** · 10-25-2007, 11:12 AM

I check the front one on mine while on the vehicle by putting the trans in gear (or park for automatic trans.) and twisting the shaft by hand and feeling the joint with my other hand to detect ANY looseness at all. Same for the middle one but for the rear joint I put trans in neutral and again twist and feel (sounds like a new dance

)
I had a pinion yoke nut come loose once that made some bad noises.Other than that I don't know what could cause your noises unless it's some sort of differential problem.

10-25-2007, 10:41 AM	#1
69GMCor70Chevy Registered User Join Date: Jul 2007 Location: Greenwater Lake, SK Posts: 175	U Jount Question I have a question on the U joints for my 69 (I have 1 long shaft with no carrier). Will I feel play/slop in the joint if it is bad? And if there is no play does that mean it is good? The reason I ask is that I was experiencing what sounded like a semi's engine brake engaging when I let of the throttle. There was clunking a little as well and a vibration when I let of the throttle slightly. But when I took the shaft off last night the joints look pretty new (I have only had the truck a couple of months) and there is no play or slop. __________________ 68 Camaro - 327 Original Red on Red Car 69 GMC LWB - Built 350 a Blast To Drive 69 GMC LWB - "Green Machine" One Family Truck 70 Mercury Marauder - Future Project

10-25-2007, 11:01 AM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: U Jount Question go right to the join and try and shake it if any play replace them if no play good to go if the got greece fittings greecce them real good __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

10-25-2007, 11:12 AM	#3
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: U Jount Question I check the front one on mine while on the vehicle by putting the trans in gear (or park for automatic trans.) and twisting the shaft by hand and feeling the joint with my other hand to detect ANY looseness at all. Same for the middle one but for the rear joint I put trans in neutral and again twist and feel (sounds like a new dance ) I had a pinion yoke nut come loose once that made some bad noises.Other than that I don't know what could cause your noises unless it's some sort of differential problem. __________________ '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.

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