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Mack had the advantage of know what their engine was powering so they could match the whole rig up perfectly. So everything works perfectly balanced and in tune with each other. The other diesels only had to make the engine was good to go.

Oh I didn't mean stop, Sorry I came in a bit to late on this. Those were the 2 combo's I have always wanted to try. The Cummins just didn't seem happy on a 5spd manual and the Mack's seemed to love the 5spd's. So I always figured a Cummins 9spd or Mack 7spd combinations would make for great...

I would have swapped an 8.3L cummins or DT466 IHC into it along an ES 7spd. of course this a 5er so maybe those would of been more of a 2.5t type of repower. 400 big cam 4 Cummins 9spd-OD, Or maybe a Mack 350 with maxi-torque 7spd-OD ? ditch the 11.00-20's 43" for 12R24.5's 45" and have truck...