Hey guys I gotta 85 z and I need to find out the easiest way to identify these rear gears..It has the stock console in it...what code denotes the gear ratio and is there a separate code for a posi..Yes I can pull the cover ..I kno this man!!! Is there a code on the axle? Any help is appreciated...

 

There is a code to find out what the car came with. That will not help you if it has been changed tho. Pulling the cover is the only way to tell unless you know the cars complete history.

 

jack up car by rear pumpkin& make shure it is safe mark your tire on bottom toward ground &spin drive shaft keeping track of rotation of both shaft & wheel /4.11 just saying ,drive shaft would turn 11 turns & tire would turn 4 / i think i got the pattern right

 

Well, if You tell us what engine and and transmission you have. We can help figure out Your gear ratio. Then if You bring it up to cruising speed and tell us what your rpm's and speed are around 70 mph with Your engine+ trans combo,,, We can probably pinpoint Ur curiosity with a nail to the head!

 

Well it HAD a 305 TPI with a 700r4..I dont know cruisin speed it dont run..motor has left the building. Yes i have the history of the car..but I dont know the codes..Yes I can pull the cover...would rather not..yes Im difficult.lol

 

Well in that case... You either have a 3.23 ratio or a 3.42 ratio, if You have the G92 option. Check Your rpo codes.

 

U can also check the back of the axle housing (if it aint too rusty) There should be a little metal stamp piece that lists the ratio. if not, jack up the rear tires while in neutral and give em one complete spin. count the revolutions of the driveshaft. if it spins roughly 3.25 quarter times per one complete tire revolution. You have a 3.23. If it spins a little less than 3 and a half times... U have 3.42's. Use a piece of chalk to mark and measure the exact amount of spins. Good luck, and tell us what U find!

 

Thanks Rick!! I will check the codes today and let you know

 

No way man! That aint how its done. Check my post towards the bottom.

 

If you have a 4.11 gear... Ur driveshaft will spin exactly 4.11 times for every complete tire rotation.

 

yep its not a G92 I guess....didnt check the other way..will later on..Im going to start on the front first.

 

Im assuming U have 3.23's... Look for roughly 3.25 turns in the driveshaft. Anybody wanna bet on this? LOL!!!

 

No real shortcuts, though a guesser can sometimes be lucky.

JamesC

 

Yeah rick your probably right..It wont matter cause I finally got my Moser catalog in..if my combination works out I would blow it to pieces on the first launch...so when I pull it..ill check so I can sell it...thanks guys!!!