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if you are thinking of any other series transmission you will have to change rear ends to reach a reasonable road speed.   terry:MackLogo:

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I should have explained more thoroughly. I am changing the rears so am not concerned with keeping the same overdrive.  Could one of the newer Mack transmissions such as a T310 be used does anybody know? I don’t like the long step between the two top gears in the 2070. 

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If it were me I'd swap to a T2090 which is a slip fit, (IIRC) if the driveline is the same.

Edited by Rob

Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

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I found a Mack 12 speed also. Other than shortening the driveshaft will that slide right in? Not sure if countershaft is splined to take rear pto. What is the issue with running a side pto with the 12 speed when tailgate spreading?

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12 speed is a fine transmission and yes it will slide in there. I can't answer if your existing mounts will work as I've never actually done this transition myself. The 12 speed will have five reverse gears and it has a wide variety of pto speeds if operating say a pump. In tailgating, not really a lot of difference from anything else once you find the gear to set road speed as needed.

Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

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