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Old January 4th, 2012, 11:40 AM   #2
Coyote Red
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I am running a mildly built 300-6 (4.9). I am spinning 32x11.5 with 3.08's. I have a NP435 so I start in second gear with no problem (3.34:1). The trans that you have is the M5ODR2. This is a weak point in the drive line. The ratios are 1st 3.90:1, 2nd 2.25:1, 3rd 1.46:1, 4th 1.00:1, 5th 0.80:1 and as you will notice that reverse is stupid high. Currently at 70 mph I am spinning 2200 with a 1:1 4th gear. The truck originally had that same trans and I had no problem pushing 75-80 with 235/75R15, just didn't do it often. My truck will move if I want it to as it sits right now. One thing you might want to consider is getting a NP 435 or T-18 with the lower first gears 6.69 and 6.32 respectively you can get moving and keep a high rear gear set to keep MPG up with you desired tire size.
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