Quote:
Originally Posted by 86Scotty
The quickest and easiest way is an overdrive button on the end of the shifter vs. the tow/haul button. I may have this backwards but I'm almost positive the 4r100 will have an tow/haul and a torqshift will have an OD on/off on the end of the shifter. Past that you'll actually have to read, research and all that stuff.
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Definitely backwards, and also sometimes wrong
Gas engines with the TorqueShift (V10 for vans, also the V8 in some cutaways) have Tow/Haul mode with the TorqueShift.
6.0 PowerStroke vans all have the TorqueShift, but retained the OD-OFF light from the 4R100.
A better way to tell is just look for the "3". TorqueShift vans all have a shifter labelled "PRND321" except the new 6-speeds which get "PRND421". 4-speed vans have the traditional "PRND21"shifter