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Author Topic:   rear end gear ratio
TRAP
Dirt Full Roller

Total posts: 34
posted July 20, 2002 02:19 PM  
Is there a formula of sorts for computing what size gear is in the rear end based on drive shaft to wheel revolutions? My drive shaft is turning approx. 1.6 revolutions to one wheel revolution. Is there a way short of counting the gear teeth that will give me the size of the rear gear??

Thanks in advance.

TRAP

ryan
Dirt Forum Champ
Total posts: 776
posted July 24, 2002 12:37 AM  
If your rearend is already locked or welded you only have to spin your tire once if it is an open differential spin your tire twice. So based on your info depending if its locked or not you either have a 1.6 or a 3.20. Make sure to mark your drive shaft and tire with something so you know for sure what you have. I usually use a paint pen. What ever works for you. Hope that helps

TRAP
Dirt Full Roller

Total posts: 34
posted July 24, 2002 04:42 PM  
ryan,
Thanks for replying, My rear end is now unlocked but I am planning on locking it by welding. I suspected a 3.27 but was unsure. I know that an 86 with the tag still in place was a 3.27. BTW when I checked it I had the left wheel still on the floor and not in the air. does that change anything. I have a 3.11 that I had made a trade for earlier this year but im hearing the larger gear would be better suited for the track I run. Thanks again.

TRAP

ryan
Dirt Forum Champ
Total posts: 776
posted July 25, 2002 12:28 AM  
It doesn't matter if your oppisite wheel is on the ground as long as one wheel turns and the driveshaft spins. I couldn't tell you about which gear would be better for your situation I deal with the "big" cars. lol

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