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Hello, I'm curious about the trucks that tow heavy loads of the double overdrive ratio.
I would Ponder a gear pick of a 1:1 ratio for cruise RPM and Tire diameter for the final gear choice.
I would not tow heavy in anything in overdrive ratio and expect the trans to live.
Overdrive Planetary are not big or heavy duty.
68RFE has a 3.23:1 first gear ratio, a 1.83:1 second gear ratio, a 1.41:1 third gear ratio, a 1.00:1 fourth gear ratio, a 0.82:1 fifth gear ratio, and a 0.63:1 sixth gear ratio
07.5 4x4 Yukon Detroit locker Rear AAM Elect-Front Locker, DOR Front Arm, ATS/Destroke Allison 1000 Conversion W/All 3-Billet Shafts, My Stage-5+ Allison, ATS Five Star TQ Converter, ATS CoPilot, Turbo America Custom VGT, Steed Speed Manifold, (UpGrading Compound Pusher turbo s480 soon) Motorsports Diesel 100% over custom Injectors, MotorSports Diesel 10.6 CP3, AirDog II 165-5G, Rail Pressure Relief 1-Stage, Update Common Rail, Mishimoto Intercooler, ARP 425 Studs, Hamilton Springs,Ret,PR
It's an excellent question to ask around for opinions.
My 5th wheel is a little over 15k.
The truck is 2016 3500 4x4 dually 3.73 gears. And it had 33s.
Typical on the highway, I locked it in 5th and kept my speeds below 70.
I never had any issues or temps get out of place.
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