Join Date: Jul 2009
Location: North Adams, Massachusetts
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Personally, I would prefer an E4OD installtion over a Gear Vendors. Yes you need a stand alone computer to run the E4OD, however, the E4OD has TCC lock-up which will further help fuel economy and lower engine rpms. Also, the E4OD has a deeper overdrive at 29% overdriven as compared to GV at 22%. That overdrive ratio is not a big difference. I think a big part of the goal will be having or not having torque convertor lock-up (TCC). Pulling a heavy vehicle with a lot of resistance will always cause a torque convertor with no TCC to generate more heat and slip higher in the stall-range when you shift from 3rd into overdrive. This is because you have less mechanical leverage and the trans input shaft becomes harder to turn. This puts more load on the torque convertor. So, to maintain the same vehicle speed you step on the pedal more to get more torque out of the engine to compensate for less leverage. Sometimes, the rpm drop you'd get on the shift is almost washed-out because the convertor is running higher in the stall range from the greater resistance. You will never see as much RPM drop as you'd expect by looking at the ratios. Torque convertor slip can be anywhere from 200 to 1200+ rpms, with TCC that will drop to zero. When you have a torque convertor with a clutch inside (TCC), as the clutch applies it creates a direct mechanical connection and have zero slip through the convertor. It will be as solid as a clutch in front of a manual transmission.
Ford never made a C-6 with TCC.
I haven't done this swap, but with an E4OD installation some of the hurdles I can forsee would be you'd need to move the crossmember back a little ways, reconfigure one cooler line, shorten the driveshaft and run a stand alone computer. The computer is pretty darned affordable at Baumann Engineering. The E4OD will be more expensive than the GV and I am not sure by how much. However, I think it is worth it. I have plans to perform an E4OD swap into my 79 F-350 crew cab-----after the truck is restored.
If you decide to go with a Gear Vendors, for the greatest benefit I would recommend one of the low-stall towing type of torque convertors to be installed at the same time.
North Adams, Massachusetts