Gravelguy413 6 Posted February 2 Share Posted February 2 Does anybody know what Mack transmissions would bolt in place of a T2070 in a 1996 RD without any complications? Quote Link to post Share on other sites
880joe 42 Posted February 3 Share Posted February 3 2050,2060,or a 2080 will have the same overdrive only thing you may have to change would be driveshaft length Quote Link to post Share on other sites
terry 537 Posted February 3 Share Posted February 3 if you are thinking of any other series transmission you will have to change rear ends to reach a reasonable road speed. terry Quote Link to post Share on other sites
Gravelguy413 6 Posted February 3 Author Share Posted February 3 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. 1 Quote Link to post Share on other sites
Rob 2,318 Posted February 3 Share Posted February 3 (edited) If it were me I'd swap to a T2090 which is a slip fit, (IIRC) if the driveline is the same. Edited February 3 by Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to post Share on other sites
Gravelguy413 6 Posted February 3 Author Share Posted February 3 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? Quote Link to post Share on other sites
Rob 2,318 Posted February 3 Share Posted February 3 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. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to post Share on other sites
Gravelguy413 6 Posted February 3 Author Share Posted February 3 I think I read something about guys running the 12 speed with side mount pto can’t get the box to raise fast enough when tailgate spreading in low gear. Any other 12 speed users out there? Quote Link to post Share on other sites
880joe 42 Posted February 3 Share Posted February 3 I've run a low hole 6 speed which has similar set up as 12 speed and bed is slow to rise in low gear 1 Quote Link to post Share on other sites
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