Broken Six Speeds in Cummins
#11
#12
#13
they all have their limitations. Allison got the GM contract because they were low bid. they are a good trans, until you start building the big power. then they (like most others) fail. with the hp numbers you're quoting, you need a built trans- auto or manual. the weak link in either case should be tires. they will lose traction long before a good trans is overtaxed. My '03 is pushing 550 hp and 1100 ft. lbs, with a stock 6 speed. only issue is the clutch- just not enough to hold the power.
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