Slop in driveshaft....U joint?

fiveoho · Dec 10, 2007

with the car in neutral on jackstands and the e brake off, i can turn the DS side to side with about a inch play. im sure a inch is too much. can u joints cause slop in the DS? can they also cause vibration/noise when running at higher speed and letting off ( vibs occur just on initial let off )?

earleys94gt · Dec 10, 2007

I think u-joints will make a clunk sound when you initially put the car in gear, and move either foreward or backward.

If the engine RPM is constant, regardless of the gear, and the vibration continues, I don't think it's the driveshaft.

HISSIN50 · Dec 10, 2007

Are you turning the sections of DS against eachother or is the slop in the entire driveline?
You can have issues ahead or behind the DS causing the slop.

DS speed is absolute so vibes that occur at higher speeds can very much be linked to driveline slop (from the trans rearward).

More info about what has been tested and how will help.

Good luck.

fiveoho · Dec 11, 2007

earleys94gt said:
If the engine RPM is constant, regardless of the gear, and the vibration continues, I don't think it's the driveshaft.

only does it when i let off the throttle, more so at higher speeds in higher gear (5th mostly)

fiveoho · Dec 11, 2007

HISSIN50 said:
Are you turning the sections of DS against eachother or is the slop in the entire driveline?
You can have issues ahead or behind the DS causing the slop.

DS speed is absolute so vibes that occur at higher speeds can very much be linked to driveline slop (from the trans rearward).

More info about what has been tested and how will help.

Good luck.

when i feel the slop by hand, im twisting the DS side to side. there isnt any up and down or side to side play.

i know what i want to say, i just cant word it well. does what i typed make sense?

divit250r · Dec 11, 2007

It sounds like the backlash in the gearset is off, by the description of it being a rotating slop.

Scott

fiveoho · Dec 11, 2007

divit250r said:
It sounds like the backlash in the gearset is off, by the description of it being a rotating slop.

Scott

someone else mentioned that. i took it back the guy who put the gears in ( 6-8,000 miles ago) and he said the backlash and gear set looked fine. possibly mechanic too lazy to fix it

cold5.0 · Dec 12, 2007

A bad U-Joint CAN cause noise at high speed

fiveoho said:
with the car in neutral on jackstands and the e brake off, i can turn the DS side to side with about a inch play. im sure a inch is too much. can u joints cause slop in the DS? can they also cause vibration/noise when running at higher speed and letting off ( vibs occur just on initial let off )?

I just replaced the U-Joints in my car because I was getting what I can best describe as a whining or humming noise in the 65-80MPH range. It sounded like it was coming from the transmission, fortunately it wasn't. Above or below these speeds, it was almost undetectable. As it turns out, the needle bearings in one the Ujoints were dry and rusted...so bad in fact that the cap was seized to the spider...causing the Ujoint cap to move slightly in the yoke. NOT GOOD. I had the exact same problem on my 88 GT, so I recognized the problem, and fixed it quickly before it caused any real damage. Bad Ujoints CAN cause slop in the drive train, but only if they're VERY BADLY WORN, and you'd probably already have grinding noises coming from under your car at any speed. I'd lean towards the backlash in your gears as a prime contributor, and normal wear and tear to your tranny second, as cause of your slop.

fiveoho · Dec 13, 2007

http://forums.stangnet.com/showthread.php?t=731198

ftr: all my u joints looked good, didnt replace any

Slop in driveshaft....U joint?

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