ThaddeusW Posted September 5, 2007 Share Posted September 5, 2007 I power washed the crud off the transmission and it says TRTL-72. Now what does 72 mean? I see that if it was a720 it would denote an overdrive gearbox. is it a 13 speed in the sense that you dont split 5th correct? just 4th hi and strait to 5th. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/2827-need-some-tranny-info/ Share on other sites More sharing options...
HK Trucking Posted September 5, 2007 Share Posted September 5, 2007 TR = TransmissionT = TriplexL = Lightweight version. (Aluminum top covers)72 means it is direct in 5th. (hi split in the compound is overdrive)This is known as a single overdrive triplex.It is a 15 speed. (can also be split shifted in 5th just like in the rest of the gears.I believe this is the same as the transmission in Larry "Freighttrain's" B61. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/2827-need-some-tranny-info/#findComment-13775 Share on other sites More sharing options...
ThaddeusW Posted September 5, 2007 Author Share Posted September 5, 2007 Thanks Herb. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/2827-need-some-tranny-info/#findComment-13778 Share on other sites More sharing options...
Freightrain Posted September 5, 2007 Share Posted September 5, 2007 Ya, mines a single over triplex, though not a lightweight version(only a TRT). You can split all the gears right up to the big hole! Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2827-need-some-tranny-info/#findComment-13781 Share on other sites More sharing options...
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