diggerpro Posted January 28, 2019 Share Posted January 28, 2019 (edited) I've been searching for more than a few years for a TRDL725 Unishift Transmission for my B61 I still haven't given up hope of someone running across one. I'm willing to pay a considerable amount for one to keep my B61 all original. My rear case is split and I also would consider one that has a good case for parts to repair mine. I have a beautiful truck sitting because of the trans and hate to alter it to drop in the Duplex I have sitting in the shop. Send me a Pm here and I'll get back to you Edited February 5, 2019 by diggerpro Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/ Share on other sites More sharing options...
Rob Posted January 28, 2019 Share Posted January 28, 2019 Is your rear case busted with chunks missing, or just cracked? I've welded a couple back together that were cracked and blasted them to both stress relieve and lessen the appearance of the repair. Why not slip that duplex into the truck till you get the Unishift repaired rather than let the truck set? Same length to the two transmissions IIRC. Do you still have all the hardware that made the Unishift operate? I may have some but not all. My truck had one with a busted rear case also many moons ago. 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/55428-needed-mack-trdl725-unishift-transmission/#findComment-414299 Share on other sites More sharing options...
mackb67 Posted February 5, 2019 Share Posted February 5, 2019 Have a MonoShift in a B65T rolling chassis that was a project that I am never going to get to. Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-414899 Share on other sites More sharing options...
diggerpro Posted February 5, 2019 Author Share Posted February 5, 2019 Im not familiar with the monoshift unless that is a generic term for the Unishift. Is your trans a TRDL725? Are you willing to part it out if it is? Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-414949 Share on other sites More sharing options...
terry Posted February 5, 2019 Share Posted February 5, 2019 1 hour ago, diggerpro said: Im not familiar with the monoshift unless that is a generic term for the Unishift. Is your trans a TRDL725? Are you willing to part it out if it is? It's hard to see but that looks like a 67 series trans. terry Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-414954 Share on other sites More sharing options...
mackb67 Posted February 6, 2019 Share Posted February 6, 2019 UniShift is the correct term for this transmission, I had somehow gotten the incorrect MonoShift ingrained in my mind. Next time i am out where it is parked, I will get a look at the numbers but it should be a TRD725 or TRDL725. For the right $$ i would part it out as no one seems to want the complete project truck with the very nice contour cab Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-415024 Share on other sites More sharing options...
Rob Posted February 6, 2019 Share Posted February 6, 2019 (edited) On 2/5/2019 at 3:16 PM, terry said: It's hard to see but that looks like a 67 series trans. terry I would agree. The flat top bolt on cover access plate is common to the TR-67 series where the TR-72 series does not have this flat plate. Circled in yellow: TRD-7225 "Unishift": TRD-67 "Duplex" as I don't have a "Unishift" photo: The smaller transmission was common in the single axle tractors in those days. "Monoshift" was the term when behind a gasoline engine, "Unishift" when behind a diesel from what I've seen and read. Photos are from my 1965 B series service manual. Edited March 14, 2019 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/55428-needed-mack-trdl725-unishift-transmission/#findComment-415029 Share on other sites More sharing options...
mackb67 Posted February 9, 2019 Share Posted February 9, 2019 I guess that answers what it is, I could find nothing on it to identify what it was other than casting and part numbers. ...QUESTION: Would a TRD67 be what might have been fitted in a B42SX as I have two of them in a returning to nature state. Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-415307 Share on other sites More sharing options...
Rob Posted February 9, 2019 Share Posted February 9, 2019 A 67 series, most likely, yes. However, it could also be a triplex, or quadraplex too as a duplex wasn't the only option. 1 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/55428-needed-mack-trdl725-unishift-transmission/#findComment-415309 Share on other sites More sharing options...
diggerpro Posted March 12, 2021 Author Share Posted March 12, 2021 Still looking for a TRDL 725 transmission Still havent given up hope . Almost getting too old to change transmissions out but might still giw it a try if I find one.... Quote Link to comment https://www.bigmacktrucks.com/topic/55428-needed-mack-trdl725-unishift-transmission/#findComment-470453 Share on other sites More sharing options...
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