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Mine downshifts and compression brakes exactly as you described quickfarms. Maintaining proper stopping distance is crucial in these trucks, and it depends on the weather and traffic conditions also. I have a class a cdl and own 2 dump trucks, and am very familiar with the use of compression...

quickfarms, thanks for informing us about the piston location. my no load rpm is 2150.

Update: went and helped 2 farmers move approx. 90 round bales on 8/5. before hauling hay, I adjusted the modulator up 2 turns shorter. I think I am now out of adjustment on the injection pump end of the cable. so that is 4 turns total that I have shortened the cable. my 1-2 upshift is now...

Jason O, I'm sorry but which paragraph? BTW, my wife and I really like your bikini top in the mod section. when we were shopping for m923's we drove an older tan one that was missing the whole top. she really liked it. ever since we got ours home she's been wanting to take the soft top off...

I understand what you are saying about the torque converter and the lockup. when engaged, the torque converter becomes a clutch so to speak, with a 1:1 drive ratio with no slippage. I think for the most part the lockup is working correctly in 5th gear. when offroading at slow speeds the...

Jason 0, I agree with what you said about encouraging an upshift by lifting on the throttle ever so slightly. my truck does just that from a stop on a slight downhill grade. 162tcat, I think I have read that before on here about going to Allison only for repairs and tune up. wish I could a...

I have read the TM, 9-2320-272-10, pages 2-105 and 2-106. from what the book says, it sounds like I have been making the right decisions by limiting the upshifts by manually shifting down one or two gears on hilly steep county roads. no extra shift in 4th gear with a 200 rpm drop. I do not...

hello everyone, I would like to start a thread specifically about how the mt654cr trans acts while upshifting/downshifting. my truck is a 1990 am general m923a1. I have owned it about a month, and have driven it approx. 600 miles. seems to be a very solid truck mechanically and...