mandt428 Posted July 25, 2014 Share Posted July 25, 2014 Is it possible to change X107 direct to X107 overdrive transmission fitted in 1978 Rmodel 237 hp Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted July 26, 2014 Share Posted July 26, 2014 not that I have heard of. there was a early version of the 6 speed that had direct and high on the 2nd stick. it only had one reverse gear as well. they are hard to find 1 Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted July 26, 2014 Share Posted July 26, 2014 I think he means just going from the 6 speed to a 6 speed overdrive. From what i understand their the same just one is overdrive. Quote Matt Link to comment Share on other sites More sharing options...
Jeff M Posted July 27, 2014 Share Posted July 27, 2014 not that I have heard of. there was a early version of the 6 speed that had direct and high on the 2nd stick. it only had one reverse gear as well. they are hard to findI drove (or at least thought I drove) one of those back in the late 60's. I've never seen or heard of another one--not even on this forum, so I was beginning to wonder if I'd dreamt it. Thanks for restoring my sanity. :-) Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted July 27, 2014 Share Posted July 27, 2014 The 71 DM 600 below had that transmission Quote Link to comment Share on other sites More sharing options...
bulldog man Posted July 27, 2014 Share Posted July 27, 2014 HK Trucking Would be 1 of those that would possibly know . I Think Herb hangs out on FB More nowdays than he does here in BMT .Ive always herd of the 6 spd OD But never seen 1 personally .ive always been around & drove the 6 spd w/ 5 reverse gears . Quote You Cant Fix Stupid. But You Can Numb It With A Sledgehammer. Link to comment Share on other sites More sharing options...
Brocky Posted July 27, 2014 Share Posted July 27, 2014 mandt428Are you asking if the gears can be turned over to make it an OD??? I know it was done in the 9 & 10 speed Roadrangers but I have never heard of it on a Mack.. Quote Brocky Link to comment Share on other sites More sharing options...
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