ClassicTVMan1981X Posted March 7, 2014 Share Posted March 7, 2014 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 Quote Link to comment https://www.bigmacktrucks.com/topic/34942-allison-at545-and-mt643-automatics/ Share on other sites More sharing options...
rsb502 Posted March 8, 2014 Share Posted March 8, 2014 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. Quote "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" Link to comment https://www.bigmacktrucks.com/topic/34942-allison-at545-and-mt643-automatics/#findComment-236269 Share on other sites More sharing options...
Quickfarms Posted March 11, 2014 Share Posted March 11, 2014 The MT643 has torque converter lock up in 3rd and 4th. I have them in both of my fords. When properly setup they are a good trans. I like them when driving in traffic and for parades. But I do miss the two stick. Quote Link to comment https://www.bigmacktrucks.com/topic/34942-allison-at545-and-mt643-automatics/#findComment-236837 Share on other sites More sharing options...
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