Thanks folks for all of the input. Unfortunately, the 3 speed Brownie I had my eye on fell thru, it isn't heavy enough for my truck. So, this raises the question, should I countinue to search for an auxilliary transmission or do a rear diff. swap???
Grigg, I'm not sure what the gear ratio is on my truck yet but I think it's in the high sixes or low sevens. When going 45 mph, the engine RPM is very high, I'm sure well over 3,000 rpm.
Thanks 3B for the explanation, that helps.....
