If you are near JW, I would also go with his Towmaster Transmission. I also spoke with John on the phone when mine was going out, he is the one who suggested I go with the HD4R100 as I did not have the time to allow the trans to be built and shipped, before a long trip with the trailer. I thought it was pretty cool he offered up the idea as even the local dealer's (not Ed) didn't even know about the HD4R100 at the time.

Besides, if you want JW is a DP Tuner dealer IIRC, he can hook you up all the way around!