GM 6.0/4sp vs. 8.1/Allison vs. 6.0/6sp
Hi all. My Towrig in Sig is getting a little long in the tooth. We just bought a New to us Toyhauler which is quite a bit heavier than our old trailer and my truck is hating life lol!! We were pla...
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I have an 03 2500HD with the 8.1 and Allison. The Allison is the only auto trans that was installed in trucks with th 8.1. As was previously stated the Sub and Avalanche did not get the Allison because it did not fit. The rear axle in the 8.1 trucks is different than the 6.0 trucks. It has a larger ring and pinion and is the same as is used in the Dmax trucks.
I have mostly towed a 10,000lb gross toyhauler with a quad in the bed also. No trouble maintaining speed when towing even on hills.
I have mostly towed a 10,000lb gross toyhauler with a quad in the bed also. No trouble maintaining speed when towing even on hills.
