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Author Topic:   What rear gears to use
exxonshane
Dirt Roller

Total posts: 5
posted October 31, 2001 05:48 PM
I have a TH350 with a 8.5 10 bolt rear end, I still have the stock gears of 2.73('77 Nova). The 2nd gear in the tranny is 1.52. What gears should I put in it. What should the overall gear ratio be to run on a 3/8 oval.

racer17j
Dirt Forum Champ
Total posts: 1565
posted November 01, 2001 02:38 AM UIN: 54865418
what size tire are you running ?i'm going to be running a 3.23 2nd gear with 79 in roll tires next year on a 3/8

exxonshane
Dirt Roller

Total posts: 5
posted November 06, 2001 07:40 PM
I'm going to use 255\60 on the left and 275\60 on the right. Both on a 15" rim.

racer17j
Dirt Forum Champ
Total posts: 1565
posted November 07, 2001 03:17 PM UIN: 54865418
run a tape around your rears to see what the roll is and then what rpm do you want to run also?

exxonshane
Dirt Roller

Total posts: 5
posted November 07, 2001 06:08 PM
87" on the left and 89" on the right

racer17j
Dirt Forum Champ
Total posts: 1565
posted November 08, 2001 10:13 AM UIN: 54865418
i would try a 373 or 410 depending on how hard you plan on turning your motor

Flatlander
Dirt Freak

Total posts: 310
posted November 08, 2001 11:21 AM
you need to end up around 650

redneck bubbas racing
Dirt Freak

Total posts: 213
posted November 28, 2001 12:39 AM
What you have now is a real good combo. I raced a 686 final( same as yours) on a 3/8 last year it it was perfect. This year I ran it on a 1/4 and it was a little slow out of the corners. I would keep what I have and run in first only.

hughes
Dirt Maniac

Total posts: 141
posted November 28, 2001 08:05 AM
Thats hard to say because what some claim as a 3/8 may be closer to 1/2 mi then others claim 3/8 and its more like 1/4 mi. Most racers in your class won't tell you any information when you get to technical questions. I would go to a Modified/ latemodel driver who you know (or a friend knows) who has moved up from a similiar class and ask them.

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