Wheel hop

[84GP455]

Well i just finished installing my GN posi rearend with discs and now that both tires are gripping real well i now get severe wheel hop when doing a burnout. What causes this and how do i get rid of it? My old rear was smooth as heck when smoldering the tires how come this rear hops now.? I have never had this problem with this car before with 3 different rearends and over 20 years of owning it and doing burnouts.

 

[AlanB]

What else was changed along with the rear? Control arms, Shocks, springs, sway bar, tires, wheels, anything at all? Was the prior rear a posi? What about the bushings mounted on the upper control arm mounting tabs on the rear? Did you keep the ones that came with the 8.5 rear?

I would suspect worn bushings or shocks, but the fact that you didn't have this problem before is a bit puzzling, unless you changed something else that could cause the problem.

 

[zeasty03]

i had the same problem on my 1980 malibu after it sat for 4 yrs. it had really bad wheel hop and it just had the stock rear end in it. come to find out the shocks were blown out and once i changed the shocks the problem was solved.

 

[84GP455]

I used the 8.5 lower control arms with the upper 7.5 original ones, i hope this wasn't the problem i thought they were the same? The old shocks were put back on and they seemed fine, I used the 7.5 sway bar on the 8.5 also, same tires and rims.

 

[anakputa]

How are your bushing? People tend to overlook them. If they are worn this will cause wheel hop. Also if you have a HP at the rear wheels look at getting boxed lower control arms..Worst case scenario is the pinion angle correct since you are mixing different arms...

 

[zeasty03]

just try changing the shocks first and see if that solves the problem. i thought mine were good cause there wasnt any fluid around them. but i still changed them and that fixed it. plus its the cheapest way to find out

 

[AlanB]

When you swapped the rear you also swapped out 6 of the 8 control arm bushings: all 4 lowers, and the two uppers mounted to the rear. If you still have the 7.5 lower control arms, try swapping them back in to see if that helps.