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Author Topic:   3/8 mile help
Dirt Full Roller

Total posts: 65
posted August 03, 2005 05:39 PM  
I have raced on 1/4 and 1/3 we use a roll out of 90 to 91 in the rear and Now We have to use a much small tire 88 to 86 we run a 7.29 final gear 10 bolt rear end and now we are building a metric with a 9 inch rear end I'm not sure what gear I need for 3/8 I was think a 6.20 to 6.50 final looking for the 7000 mark on rpms any information will help

Dirt Forum Champ
Total posts: 5390
posted August 03, 2005 07:44 PM  
We change trannys when going to a 3/8 track and run a 6.52 gear....on our 1/4 track we run 7.01

If you can't work em in close & git em in your face with their orange landing gear down, don't bother taking the safety off......

Dirt Freak

Total posts: 461
posted August 03, 2005 10:09 PM  
on a 3/8 that we run our tire roll out is 83 or so SO i would say a 633 also would be pretty close

Dirt Full Roller

Total posts: 65
posted August 05, 2005 11:40 PM  
thanks for the reply I know I was close but wanted to be sure thanks you people make this place a great forum to use everyone has alwaaaaays helped and I take off my hat to every that has helped someon on here

Steve Dupree
Dirt Freak

Total posts: 316
posted August 06, 2005 06:42 AM  
On our 3/8 mile track with 87 inch tiers 6.50 would be the gear if turning 7000. We run a 91 inch on this one track with 6.50s and staying at 6200 for our motor strength.


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