Thanks all who replied. So since I have 3.00:1 ratio, then somebody has been into the c6, cause that thing takes off like it has 3.55:1 gears

 

Yeah, that makes more sense to me now. Turn one wheel 2X to get the carrier to make one revolution and three revs of the driveshaft to equal a 3:1 ratio. You must have had the tranny in park instead of neutral, which is why I suggested turning the driveshaft instead of a tire/wheel. Anyhow, even a standard C-6 that's been recently rebuilt will slip very little compared to the old one with alot of miles and worn clutches, plus you have a fresh engine. Many times, the "sluggish" feeling you get from the use of taller-than-stock tires is due to a poorly running engine or tranny problem. If you ever get a chance to ride or drive a similar-equipped Bronco with 4.10:1 gears and 33" tires, you may re-think the performance of your 3.00:1 ratio. You'll be glued to the seat upon take-off!!!

 

Well, it doesent slip much at all when its warmed up. Ever heard of anyone reprograming a valve body to run a c6 in low range?

 

Justshootme Look to the bottom of this thread and the next page. I started a thread in the tranny diff forum.
https://www.ford-trucks.com/forums/s...2&page=2&pp=12