I was hoping to ask this question once these trucks have been run, lifted, and tuned for a while. I don't want to reignite another epic battle over this topic, those involved will attest, Pahrump and Wildcat.
Ok, enough poking the bee hive and to my point.
I, like several, have lifted my 08 crew cab, put 37's on it and left the stock gearing at 3.73. With the 250 tune my truck ran 14.1 in the quarter mile with the 37's on and got down to 13.9 with my stockers on the hubs. I am sure rotating mass and diameter play a large part in this difference, not to mention that this was my first time at the track with the truck and reaction times may be relevant, but would be so in both cases. (Sorry, haven't gone with the 275 yet).
I have thought over and over about putting in 4.30s, which would put me back in the area of stock gearing with stock tire size. I am just having trouble coming to terms with the $2000.00 it would cost to purchase and install the gears.
My question is, has anyone with a similar set up run their truck down the track with the stock gearing and then re-geared.
What was the difference in time?
Was the expense worth the increase?
Any difference in fuel economy?
With my truck (275 tuned) I noticed that using my stock tires the converter would lock up at 50mph NO MATTER WHAT, and I loved it. With the 37's on the lock up would delay to 60 or 70 mph and sometimes wouldn't lock at all until I let out of the gas a little. It will lock up at 50 under light to moderate throttle but delay under moderate to heavy acceleration. I am sure this is from the added resistance of the larger tires and added mechanical (gearing) drag.
Just looking for some feedback and any time you guys put in to providing the info is much appreciated.