4 speed or 5 speed?


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Posted by Mike Hernke [63.151.218.18] on Monday, September 16, 2013 at 12:32:19 :

Wondering for anyone with experience with ZF 5 speed behind a cummins 4bt, would it be worth it over a 4 speed? I have 4:56 gears, 40" tires and my M37 weighs 6500 lbs. I did the math and at 60 mph and a 4 speed I should be at 2350 rpm which seems okay. The 4bt is strong but I wasn't sure how 105 hp will do with overdrive and large tires. I am currently swapping axles and going to a married transfer case so now would be the time to go to the 5speed. I have the ford bell so the zf is the most obvious 5 speed. I have done the numbers and don't think I need the 5 speed but especially with gearing it is hard to beat experience. Thanks.



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