Larger tires, smarty, and shift points

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Jun 25, 2010 | 07:16 PM

#16

ultramag

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Joined: Nov 2007

Posts: 66

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From: stonewall,manitoba,canada

i too noticed shift points are different when re-calibrating for my 285-70-17''''''''s with my smarty Jr. i found that using my tow/haul button and once up to 55mph i lock up the o/d it seems to be a lot smoother.i am in the midst of ordering a new triple disc dtt TC and towing V/B.Really ecited to see how this combo will help me towing our 32Ft fiver @13,500 lbs

Jul 23, 2011 | 07:49 AM

#17

thebooger13

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Joined: Oct 2009

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Quote:

Originally Posted by Raspy

This is one reason it can feel sluggish. Mine did when I went to 315s from 265s, but was still running stock power. After doing a pinion factor adjustment it drove a lot better. Of course, more power makes up for the higher gear ratio that larger tires bring.

What size 315's did you go to? I'm running the 265-70r17's that I got with my truck and I've seen trucks with 315's but I don't remember the second number. They were on stock rims and I don't believe the trucks had any kind of lift. Can you help? thanks.