I have an 88 formula 350 with 3.27 posi in the rear currently and I was wondering which gears would benefit me the most in the 1/4 mile. Mods are in my sig.

 

You're pretty much stuck with either what you have, or a set of aftermarket 3.70 gears, which are known to be noisy. You might be able to find a set of used 3.45 gears, but you'll need some luck.

 

Why am I stuck? I was thinking some 4.10 or whatever.

 

You're stuck because the only aftermarket 9-bolt gears easy to find are the 3.70's, and they're noisy. Everything else is either impossible to find, or impossibly expensive.

 

Kevin:

Why do you say the 3.70s are noisy? Depending on the brand and how they are setup can cause them to be noisy but not all should be that way. What kind of gears were you running?

 

Both mine and my dad's whine while driving at freeway speeds, 55-65 MPH. When coasting, or above and below that range, the whine is minimal.

 

Sorry to bring this back up, but I am able to get rear end gears and what is a good price for a set, and what gears should I get? I looked on ebay and they have a few. Also, what am I looking for? 9 bolt... is that all that matters or are there more details?

 

Lot of gear sets are available, but you have a BW 9-bolt rear which was discontinued by GM in 1989. So very few aftermaket parts are out there for this rear. NO 10-bolt parts are intrtchangeable with the 9-bolt.

 

What does the BW mean?

 

Borg Warner

 

Okay, so any Bw 9 bolt rear end gears will fit?

 

Probably. It takes a 7.75 inch ring gear. I have some link on my computer at home for good places to buy gears for this thing. I'll post them if I remember. I think all I could ever find was 3.70 ratio and they were around $200.

 

Here are some link to site that have gears for the 9 bolt. I have not purchased from these sites but the prices seem reasonable. The only ratio available from these sites is 3.70

http://www.jawsgear.com/store/catalo...ath=21_105_116

http://www.ringpinion.biz/index.php?...70f1bccbf7eb68

Not sure if they have gears but they do have parts for the 9 bolt.
http://ratech.stores.yahoo.net/79bogmax.html

http://www.accuautoparts.com/

http://www.ringpinion.com/Default.aspx

http://www.reiderracing.com/gm734.htm

 

couldnt you just get a set of 3:73 gears?

 

no only 9 bolt gears are 3.70s. 3.73's are for 10 bolts and other rear ends.

but i'd recommend 3.70s for your combo. your setup with that superam will love it. i have 3.42's in my 10bolt and my HSR/L98 combo. it makes peak power at 5050rpms, and i cross the line near 4500 or so. i need more gear and 3.73's would be best.

reider racing has the 3.70 gears with install kit needed (new bearings and such) for $299 last time i checked