3.73 rear end not posi?

84Z28HO · Mar 20, 2001

I have the original options sheet for my 84 Z28. It states that the axle ratio is 3.73. I can only get 1 wheel to leave a strip. I had figured that for a sports car it would have either full posi or limited slip. Is there something wrong with this rear end? Or did I happen to get a non posi or limited slip rear end.

JonT · Mar 21, 2001

Pull the cover off the pumpkin...be sure and put an oil pan underneath first and check out the rearend. You may very well have a posi but it's on it's last leg (pun intended).

big gear head · Mar 21, 2001

There should be a white decal in the console with a bunch of RPO codes on it. They will be in alphabetical order and all will be 3 digits. Look at the codes that start with a G. These are the rear end codes. The code for limited slip or "posi" is G80. If there is no G80 there is no posi.

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'69 RS/SS396 pro street
427/4spd/9"

eric39 · Mar 21, 2001

you can jack the *** end up turn the wheel if the other doesnt spin its not a posi , but you can buy a posi unit for yuor gear , 3 or 400 bucks and they usually charge around 150 to do the work not unless u can do it , later

JonT · Mar 21, 2001

Pull the pumpkin off...it's quick and easy and the only way to tell for sure.

If the rearend is badly worn, the tires spinning with the rear end jacked up won't always work.

oger · Mar 21, 2001

Jack up the rear end turn one wheel if the other turns backwards it is an open rearend

69er · Mar 23, 2001

LOW BUCK POSI: If you can't afford posi, try adding an air bag to the right rear spring. You'll have to play with the pressure a little. When it is set correctly, it will help to equalize the load between both wheels. It definitly isn't as good as posi but is better than an open rearend. Oh my.

69er

84Z28HO · Mar 23, 2001

Thanks for all the help. I will check it out this weekend. It's in storage right now but I'm taking it out within the next 2 weeks and I have to check a few things before I do.

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1984 Black Z28
305 HO Auto

Chris Edwards · Mar 23, 2001

I have my91 Fbird with a 3.42 posi rear. but I never changed the fluid, so now it Truly is limited slip, as sometimes it works, sometimes it doesnt,

I love 2 tire burnouts. but most of the time Mine only smokes 1

bottledpower · Mar 24, 2001

my 85 IROC is locked all the time. it chirps the inner tire on sharp turns, and ive never been in it. i guess its previous owner may have chenged it out. pretty cool for me.

3.73 rear end not posi?

84Z28HO

JonT

big gear head

eric39

JonT

oger

69er

84Z28HO

Chris Edwards

bottledpower

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