Fast 95 Z28

I was just drag racing my 98 SS 6 speed and i took off fine. Chirped 2nd and 3rd gear then when I hit 4th gear I let out the clutch and there was a loud noise which seemed to come from the rear end and it violently jerked the car at around 85-90mph so I let off. I'm worried about this and there are no leaks or anything coming the car. The car still drives perfectly fine on the road. This only happened 2 out of the 4 times I raced. My mods are LS6 intake, !EGR, Lid, Custom ram air, cutout, flowmaster catback, all free mods. Does anyone know what could be wrong with my car? Slipping clutch? Any help will be appriciated.

Thanks

Fast 95 Z28

no one has any idea?

CamaroSS22

iTrader: (1)

I would pull the cover off the rear end and inspect the teeth on the ring gear and pinion. I dont know how many gear sets i have seen break on a 10 bolt. I drove my car for another 6 months with this problem until i changed the fluid and a tooth was missing off the pinion. Its an easy and cheap check.

Fast 95 Z28

did your car still drive perfectly fine under light throttle?

Fast 95 Z28

bump.

tording99Z28

iTrader: (3)

What kind of tires were you using to drag race with? If you were using anything that hooks well like any sticky tire or even a good Drag radial I would guess ring and pinion as well. Stock 10 bolt takes a beating especially in an aggressively driven M6 car.

1Loudz28

iTrader: (47)

mb your exhaust banging your body due to wheel hop?

Fast 95 Z28

i was racing with Zexius 275/40/17 street tires and they don't hook for **** i spin them all though first launching at 2000rpm at 25psi.

tording99Z28

iTrader: (3)

Well if you were spinning then its more than likely not the rear end. They are weak but tires spinning will not break them. I would check the exhaust like already mentioned, maybe its banging into the bottom somehwere.

Fast 95 Z28

It probly isnt my exhaust since its all stock except my catback and the car only has 65,000 on it. But I was also thinking it might be my clutches in my rear end going out.

tording99Z28

iTrader: (3)

From my experience clutches will not cause noise, they just slip and you will often turn into a one tire fire at the track where only one tire will spin. Its possible I guess but I don't think likely. Pull the diff cover and have a look, see if anything looks awry.

Fast 95 Z28

bump.

CaramelPleasure

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CaramelPleasure

Check trans mount, u joints, and rear end. If you're lucky it will be one of those.
good luck

CaramelPleasure

probably not a "good" suggestion but i would take it on a road near home and give it a good amount of gas for further diagnoses. but thats my cheap way out. lol

Fast 95 Z28

bump.

13lu91rS

iTrader: (1)

lol isn't this how everyone fixes their ls1's?

LS6427

iTrader: (2)

I think you ran over a small block of wood, it flew up and smacked the car.

You're good to go.

Fast 95 Z28

Haha I guess the Infineon's drag strip is out in the dirt.