possiable U-joint bad?

[LSWONZ28]

Hey guys I'm not really new here but just have been absent for a couple of years while i had a momentary brain fart and sold my old '99 Z28....now 3 years later I've again got a '99 Z28 pretty much exactly the same as my old one it's got the A4 tranny in it and the car seems pretty fast it still had the stock exhaust on it when i bought it but has a K&N intake system and i know it's bound to have some aftermarket gears in the rear. The car came stock with 3.23's in it but at 60mph in overdrive it's taching about 2K seems a little hight for 3.23's i thinking maybe 3.73's? anyways enough rambling on under hard acceleration you hear a sorta THUD when you intially hit the gas. My friend tells me this is most likely the universal joint having some play in it...We are going to check it tomorrow at work just to make sure but I'm kind of looking for a little comforting tonight lmao I love this car and i don't wanna be thinking something else might be wrong? Thanks guys!

[Orange SS]

check tranny mount

[2001NBMZ28]

www.f-body.org/gears/ is what I use after tuning to make sure my gear swap takes, it's accurate for my 2.73/3.42


Forgot to welcome you back! :)

[LSWONZ28]

Well we check the U-joints today at work and they seem to be fine. We are going to look more closley at it Thursday but I'm leaning towards the tranny mount now too. It seems to be almost right below the drivers seat and when it does it you hear a thud like noise and also sort of a screeching sounds almost like a spinning a tire except the tires are not spinning lol.

[LSWONZ28]

Forgot to welcome you back! :)


Thanks it's good to be back and awesome to be behind the wheel of a LS1 again!