diggerpro Posted August 23, 2011 Share Posted August 23, 2011 Had a bad day today with my B61 / Unishift transmission. I have maxi brakes installed on my truck and it has sat for about 3 months . Went out today to move it and built up air and took the brakes off and they were fast. I tried to ( gently) rock the truck in reverse and 2nd low and heard a terrible noise from below. Got out and found the auxiliry case split!!!!! Can't believe my eyes, never have seen a Mack case split ever---- but this one is- Need to find a unishift trans to replace it- air shift one. Any help would be greatly appriciated! Quote Link to comment https://www.bigmacktrucks.com/topic/20283-help-unishift-transmission-need-one/ Share on other sites More sharing options...
Rob Posted August 23, 2011 Share Posted August 23, 2011 You would be better off replacing with a duplex two stick. If you can find parts for the unishift at all, to repair what came apart internally, the case can be welded back together. Those transmissions were troublesome unless kept in proper adjustment and maintained well, and often.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/20283-help-unishift-transmission-need-one/#findComment-84261 Share on other sites More sharing options...
Superdog Posted August 23, 2011 Share Posted August 23, 2011 I've got one that was pulled out of a H-67.Truck sat for about 25 years,we never tried it,for fear of alot of hassle with all the air controls from it sitting,replaced it with a 2 stick duplex.I wouldn't be afraid to use it for parts.Let me know if you are interested.I'm in Iowa. Quote Link to comment https://www.bigmacktrucks.com/topic/20283-help-unishift-transmission-need-one/#findComment-84279 Share on other sites More sharing options...
mowerman Posted August 24, 2011 Share Posted August 24, 2011 ya,thats my oppinion,swap it out,had one i hated it,,theres plenty of two sticks around,,good luck...bob Quote Link to comment https://www.bigmacktrucks.com/topic/20283-help-unishift-transmission-need-one/#findComment-84296 Share on other sites More sharing options...
theakerstwo Posted August 24, 2011 Share Posted August 24, 2011 The front box is same on both trans. I remenber years ago we would just change the rear box to a two stick and get away from the air controls on the clutch that had some problems. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/20283-help-unishift-transmission-need-one/#findComment-84297 Share on other sites More sharing options...
diggerpro Posted September 2, 2011 Author Share Posted September 2, 2011 Superdog= How much do you want for your trans and has it been stored inside? Quote Link to comment https://www.bigmacktrucks.com/topic/20283-help-unishift-transmission-need-one/#findComment-84853 Share on other sites More sharing options...
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