transamz9 wrote:
I have to agree with Fish to a degree. IDK that I would go as far to say up to 29k with 3.42's. They have no problem getting started with the Aisin and have no problem running down the road but there is that in between that is not ideal and that is 2nd-3rd with immediate TC lock up. Up to 21-22k maybe but the 3.73's would be better for my 29k.
Yes, I have towed with all three (3.42 , 3.73 , 4.10) behind the Aisin.
I tow at 24,500 combined with 3.42's and Aisin, there is no shift issues. Remember that in 5th gear the 3.42's final gear ratio is the same as 4.10 in 6th. Any gain in towing with the lower diff, is offset by the .63 6th final gear ratio(2.583) verses the .77 5th final gear ratio(2.6334) for the 3.42. The slightly shorter tires on the duallies makes the final gear ratio almost identical. And the 3.42 give one a freeway cruising gear when not towing.
BTW the last RAM Fish owned was a 2006 or so.