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Allison AT545 and MT643 Automatics


ClassicTVMan1981X

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Does anyone remember any Mack Mid-Liners and MC/MR/U/RD/DMs or Volvo F6/F7s delivered with the Allison AT545 and/or MT643 automatic transmissions? If so, what were your experiences of them? Off-hand, some truckers think auto shifting takes the fun out of driving trucks; while on the other hand automatics seemed popular in garbage trucks and in buses.

The AT545 was suited to engines with 235 hp and 385 lb-ft of torque, and engines in this category were the Mack E4-210 (Mack Mid-Liner) and the Volvo TD60B (Volvo F6). The MT643 was beefier, for engines up to 250 hp and 625 lb-ft of torque; and thus the engines in that category included the Cat 3208/T (Mack 400 series) and the Volvo TD70F (Volvo F7).

~Ben

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MT643 is a solid tranny, we used em for years behind 8.3 Cummins in school buses. The 545 is pretty weak, I helped replace a few of those over the years.

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

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