leversole Posted November 30, 2011 Share Posted November 30, 2011 Thought I had to change rear end ratios to get a better top end...but have been looking at the quad gear ratios...They will do what I need!Just gotta sort throught the differnet models of quadraplex trannys to figure out exactly what I need, then find one for sale!Right now my TRTL is 4-L 1.92 4-D 1.62 4-H 1.38 5-L 1.18 5-D 1.00 5-H 0.85 Which gives me about 57 mph top end...with a double overdrive Quad (dont know the model) 18 spd... 4-L 1.20 4-D 1.00 4-H 5-L 5-D 0.84 5-H 0.70 This would extend the top end to 68 mph...which may be plenty...but...I have a sheet that says the TRQ720 (which looks like a 19 speed?!?)has three overdrive ratios as follows and woiuld give 72 mph top end 4-L 1.18 4-D 1.00 4-H 0.85 5-L 0.92 5-D 0.78 5-H 0.66 Anybody have any opinions? (loaded question!)Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/21867-new-transmission/ Share on other sites More sharing options...
slpwlker Posted November 30, 2011 Share Posted November 30, 2011 Would you have enough motor to turn the taller gears in the triple od trans? I've seen trucks that went from a 9 over to a 13 same final gear and they turned into the biggest slug out there. No rime or reason it just could not pull the bigger trans and would take you all day to get there Quote Link to comment https://www.bigmacktrucks.com/topic/21867-new-transmission/#findComment-92499 Share on other sites More sharing options...
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