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Author Topic:   rear end gears?
cmms91
Dirt Full Roller

Total posts: 39
posted December 28, 2004 10:33 PM  
what is the best gear for a 1/4 mile? i have an 8in rear end.

b4racing
Dirt Forum Champ
Total posts: 626
posted December 28, 2004 10:38 PM  
what size tires(roll out) what is in the bottom end. From what I have saw for a 2.3 ford 3.40 with a214 trannie or 355 witha 2.14 trannie.

rnoswal53
Dirt Maniac

Total posts: 120
posted December 29, 2004 07:22 AM  
So many factors to deal with, like what kind of rpms can you run, and apparently you have several transmissions to choose from and that has a lot to do with what rear gear you choose. If you could ask others at your track, they might be able to help you out best. With my Toyota and a 2.05 second gear with a 4.11 rear gear, I am turning 7800 rpms when I let off to get into the corner and that is with Hoosier 13 in race tires with about a 73 in roll out, or circumference of the tire.

Let us know a little more about what you have to work with. If you run up higher in the groove, you are going to run more rpms too.

Russ

cmms91
Dirt Full Roller

Total posts: 39
posted December 29, 2004 11:44 AM  
right now i have a 214 trann with 373 gears.
the motor is a 2500 i do not know the rollout but i use 245 on the left and 245 on th right thay are all 14s and i run on the bottom



cmms91
Dirt Full Roller

Total posts: 39
posted December 29, 2004 11:45 AM  
right now i have a 214 trann with 373 gears.
the motor is a 2500 i do not know the rollout but i use 245 on the left and 245 on th right thay are all 14s and i run on the bottom



rnoswal53
Dirt Maniac

Total posts: 120
posted December 29, 2004 07:10 PM  
It sounds like you should be close to what you are looking for. You still need to know what rpm range you can use and if retarding or advancing your cam will help. You also will probably need to use smaller inside tires for a track that small. Also scaling your car will let you know if and where you might want to add or take weight out. I started with the 245's but tried some 215's on the rear, both, and got better traction because of more rear weight bias and a little higher rpm's coming out of the corners.

Also, even though alot of guys go for the big 500 Holley, you might be better off using the 350 as it will get you off the corners better and out pull the bigger carb for most of the straights. Of course if you have a dry slick track then the bigger carb might be better so you don't spin the tires too much. Ask around to find out the rpm range for your engine and gear for that. Most DOT 245's are in the 78 to 80 in. circumference range, so you might want to try smaller ore a higher number rear gear or higher number tranny gear. You have so many options for the rear gear that you could use third gear if you needed.


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