Diamondpilot
Super Star Member
- Joined
- Jan 18, 2007
- Messages
- 16,326
- Location
- Daleville, IN
- Tractor
- Jinma 254/284 Ford 861 Powermaster at work
bosshoss said:Since GM went to a 6-speed trans. they have 3.08 and 3.42 instead of 3.73 and 4.10. Here is a chart I posted a few months ago. Don't let the low numbers
(3.08 and 3.42) fool you.
Trans ratio gearing--4 speed----------6 speed
1st gear--------------3.06--------------4.03
2nd gear-------------1.63--------------2.36
3rd gear--------------1.00--------------1.53
4th gear---------------.70---------------1.15
5th gear-----------------------------------.85
6th gear-----------------------------------.67
Overall gear ratio - trans X rear=overall ratio
-------------------- 4 speed w/3.73-----------6 speed w/ 3.08
1st gear-----------------11.4-----------------------12.4
2nd gear-----------------6.1-------------------------7.26
3rd gear------------------3.7-------------------------4.7
4th gear------------------2.6-------------------------3.5
5th gear-----------------------------------------------2.6
6th gear-----------------------------------------------2.0
I guess it depends on what all you want to do with the truck but it looks like 6 speed with 3.08 would be better than 4 speed with 3.73 for towing.
Yes, but the limits are still lower. You put a lot more stress on the drive shaft an U-joints.
Chris