Transmissions and DrivetrainNeed help with your trans? Problems with your axle?
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I recently bought all the stuff I need to install 3.73 gears as well as to put posi into my rear end, I know with this upgrade to my stock 91 rs it will throw off the speedo and i know that this can be fixed by replacing to speedo gears in the tail end of my transmission what i dont know is what gears are needed to make my speedo accurate again , I belive that i was told that i will need the 15 tooth driving gear, but I dont know if this is correct or what type of other gears i need. I know that the tire size factors into the what speedo gears are needed and I have 225/55R17 tires and wheels what gear would be used for them. I have read some stuff posted about a forumla that I can use to caculate it but it is confussing to me any info would help me out alot
Thanks
can also be done with computer chip re-burn.....I know your probably not at that point yet, but the 91' - are computer controlled and can be done both ways....just some info...
__________________ "Wide open 'till you see GOD, then brake!!"
'91 Camaro RS B4C Police Special Service Package
350 4-bolt, 10:0 w/moly rings, Holley Stealth Ram (ported), BBK 58mm, MSD ignition, Procomp heads 2.02 1.60 200cc (63hrs. port work), 30# venom injectors, Flowtech headers, full custom 3.5" mandrell ceramic exhaust w/ aerochamber, Comp cam XFI280HR (.576/.571 234/244), PCMforLESS.com tune, 58mm BBK, Custom TPI air lid, Custom RamAir, 1.6 stainless steel rollers, Custom 700-r4 2500 stall, Aluminum Drive line, 3.23 posi, Moser axles w/stud girdle cover, Spring works springs (lowered), UMI relocation brackets, panhard, LCAs, sub-frame connector, boxed A-arms, Poly bushings, Custom interior, Powdercoated & polished IROC wheels, Custom "Black Cherry" Paint", 4pt. roll bar, +++ more! "It's not the tires squealing, it the asphault SCREAMING!!"
i own a 92 rs and just changed my rear to a 3.23 from a 2.73 any body know of the top of their head what tooth i'll need and is it the one that pulls out where the speed sensor is ?
Last edited by 84z5350; 08-17-2009 at 09:24 AM.
Reason: gear ratio
"It's not the tires squealing, it the asphault SCREAMING!!" 
