Gravelguy413 Posted February 2, 2021 Share Posted February 2, 2021 Does anybody know what Mack transmissions would bolt in place of a T2070 in a 1996 RD without any complications? Quote Link to comment https://www.bigmacktrucks.com/topic/65759-tranny-q/ Share on other sites More sharing options...
880joe Posted February 3, 2021 Share Posted February 3, 2021 2050,2060,or a 2080 will have the same overdrive only thing you may have to change would be driveshaft length Quote Link to comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468171 Share on other sites More sharing options...
terry Posted February 3, 2021 Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468173 Share on other sites More sharing options...
Gravelguy413 Posted February 3, 2021 Author Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468174 Share on other sites More sharing options...
Rob Posted February 3, 2021 Share Posted February 3, 2021 (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, 2021 by Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468189 Share on other sites More sharing options...
Gravelguy413 Posted February 3, 2021 Author Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468201 Share on other sites More sharing options...
Rob Posted February 3, 2021 Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468203 Share on other sites More sharing options...
Gravelguy413 Posted February 3, 2021 Author Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468205 Share on other sites More sharing options...
880joe Posted February 3, 2021 Share Posted February 3, 2021 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 comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-468210 Share on other sites More sharing options...
Steve L Posted May 10, 2021 Share Posted May 10, 2021 You have to use a rear mount pto on a 12 speed if you want to run out, my experience with 12 speed side mount pto’s are, you need to have the main box in 4th gear to get the body to raise at an acceptable speed, hence 4th gear is much too high to move the dumpster while raising. The 12 is a very versatile and bullet proof gearbox that will work in harmony with all Mack engines, even the Superliner E9 500 which Im restoring ATM. I have done many millions of kilometres in 12 speeds since they were introduced, at times pulling over 100 tons in outback Australia and they NEVER let me down. I also regularly pulled a 100 ton with a 6 speed 237 on 4.17s before the 12 speed came out. I’m presently looking for a rear mount pto ( maybe 2 ) for my Valueliner and CH 12 speed tippers. Even part numbers may help. cheers Steve Quote Link to comment https://www.bigmacktrucks.com/topic/65759-tranny-q/#findComment-473680 Share on other sites More sharing options...
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