80'427
Veteran Member
Who is running them? What times? I am on my 3rd set of ring and pinion. Could be my setup but richmond says it could be too much power.
12 bolt in a drag car
- Thread starter 80'427
- Start date
I'm using 1968 or 69 GM 4.10 gears in my 12 bolt.
The gears have lived in 3 cars, and have had at least 200,000 street miles. Now they are driven 1 mile at a time, 1/4 of it under hard acceleration from a standing start on a spool with slicks.
The gears have lived in 3 cars, and have had at least 200,000 street miles. Now they are driven 1 mile at a time, 1/4 of it under hard acceleration from a standing start on a spool with slicks.
justincmorris
Veteran Member
the older richmond pro gears are great gears for 12 bolts but they changed the metal densisty in the pro gears recently so they are junk for real racing applications unless like I stated you can get your hands on a set that are at least 2 years old. Best bet go with another manufacturer for racing gears. My bro took his 12 bolt out of his car and replaced it with a 9inch because of the same issue you were having.
IF we EVER get it done, our 87 S10 has a narrowed 12 bolt with Moser pro 31 spline axles, spool, and 4.56:1 gears. Our "little" 292 (283 bored .060" over) will be humming through the traps in the 1/4 mile! The local track is 1/8 mile so it shouldn't see that high of rpms unless we go to ESTA.
12 bolt here. 3600 lb footbrake car running 10.30's @ 130 mph.
Richmond gears that are at least 10 years old, if not older.
Richmond gears that are at least 10 years old, if not older.
80'427
Veteran Member
its in a traction limited 3500lb camaro with 400rwhp. Richmond said it was a power break and to try on over deepen the pinion .004" And see if it helps. Seems to be underpowered compared to others here.
80'427
Veteran Member
to WHO?
