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Old 02-11-2009, 01:04 PM   #1
12v Ford
 
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Name: 12v Ford
Title: Diesel Enthusiast
Status: Not Here
Join Date: Dec 2006
Location: New Mexico
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Posts: 243
Which drag racing tranny for street/strip?

I'm getting ideas for a street/strip full size OBS ford truck with a 12v cummins used for drag racing and fun. HP will go up as money allows, so the tranny is expected to be fully built.

Standard trannys are out (too slow).

Gasser trannys are probalby out too because of the weight of the truck and torque. Lenco's and liberties are mostly full time racing trannies, so I'd have to say they're out.

The allison doesn't seem to be the cure because of the defuel on shift problems. The 5r110 is prone to breaking from what I hear.

So that leaves the 47re/48re, e4od/4r100, and the new dodge 6 speed(68rfe and Aisin).

Anyone have a suggestion for what tranny will last the longest and be the strongest? I don't think the dogde 6 speed has many parts available yet and it's probably not proven, but it would be cool if it will hold the same power as the four speeds.

How do the 4r100 and 48re compare? If suggesting the dodge 47 and 48's, which one is better?

Thanks,

Clayton
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1995 F-350 XLT CC 2wd DRW LB, 96 215 hp cummins, zf-6 sp, SBDD, HE351cw/s475/1.10 twins, SDX 5x14s, 4k springs, 10 & 0 TST plates, Mod AFC, TwinRam, ATS exh man, AFE, 5" exh, US Gear OD

1995 F-350 XLT CC 4x4 SRW LB, 97 215 hp Cummins, Built 4r100, upgrading now
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