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[QUOTE="f350guy, post: 1357076, member: 11669"] This. I love my RCD 1600 stall. No more blowing through the converter even on mild tunes. But 37s and stock gearing will not be fun with minimal mods. I ran some 35s for a while when I drove on ****ty offroad surfaces with stock 3.73:1 and truck was noticeably slower, this will be even worse with 37s. You are not only battling height but rotational mass. I think the Nitto 35 MTs I was running were about 80lbs/ea versus around 50lbs for the stock Goodyears I had when purchased new. This is only counting the tires, I did not change the wheels. I went back to stock height tires as I do not drive in that crap anymore, truck felt like it picked up a nice bump in power as it was able to put the power down so much easier. Also my fuel economy came back. So, that being said... I would regear first if you plan to keep 37s. I would probably do 4.56:1 gears, that would put you right around 2000rpm @ 70mph assuming 0.71:1 for OD in the 5R1110W Replace that junk Traclock while you have it apart. [/QUOTE]
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