How hard is it to change the 2.73 stock gears to 3.73? How much would it cost? It a '92 RS with the Lo3 and 700r4 trans

 

Welcome to TGO. Check the 10-bolt sticky at the top of the page. Many of your questions will be answered there.

JamesC

 

I've tried that combo. It's too much gear for a stock LO3.

 

Is there anything else that i can put in or am i stuck with the stock gears?

 

I purchased a rebuilt govloc off ebay for $210 shipped, my NEW 3.73 gears were $115 shipped and bought jegs mega install kit for 129.00 plus 12.00 shipping.That kit includeds bearings, shims, pinion seal, axle seals and axle bearings. Really not to badly priced but I sit back and wait for deals to pop up!

 

I got them in my car i think it fun im at 2k rpms at 60 mph. Think just the labor cost me around 5 or 6 hundred.
kevin

 

The 2.73 uses the 2 series differential. You are going to need a 3 series for the 3.73 gears, or anything from 3.23 to 4.10. I recommend a 3 series Eaton posi. To set up a ring & pinion you must know how to set the pinion depth, bearing preload and backlash to get the correct contact pattern. If you don't get these right then the rear end will make noise and might not last very long. You will need a few special tools to do the job.

 

If you're looking at various gear packages, you might note that some of the listings may read like 3:73 then 3:73thick. As stated above, you have the 2 series carrier, you'll have to have the "thick" gear to put 3:73's in.

Dan