i own an 89 gta with the 9 bolt rearend. i belive it has 2.77 gears in it because i cruise at 65 mph running 2000 rpm and at 85 it is 2500 rpm. i am starting to experience some swapping in the rearend and i think the diff. is in need of new clutches. i have emailed 9bolt.com with no reply and i do not know of any other company that sells gears and clutch kits or a new diff. for these. also all my rpo codes have been removed for some odd reason. any help would be greatly appreciated.
Doug

 

Hehe, are you sure that just isn't your overdrive tranny that lets you cruise that low? Mine cruises at 3K at 70 with 3.27 gears, but I don't have overdrive. Look at the main page, there is a data section that lists what the ratio should be for your car. Also 9 bolts have a metal tag that if you crawl under your car and find (and remove 20 years of goo) should have the ratio on it. That is if memory serves me right.

 

there is no metal tag on the rearend. does anyone no of a company that sells gears and diff. kits for the 9 bolt.

 

not to be mean but, there is so much info on this just do a search. I could spend days helping you and you would gather far more info in 5 min. of searches

 

i have searched endless hours and search pages for borg warner 9 bolt, australian 9 bolt, 7.75 9 bolt, etc. cannot find anything.

 

https://www.thirdgen.org/techbb2/sho...ht=9bolt+gears

here is a start. I used " 9bolt "