Gears & Gas
This is a discussion on Gears & Gas within the Drivetrain forums, part of the LSx Technical Help Section category; This is my first post on this site! Just so happens, also for the first time, I paid $3.00 plus ...
04-21-2006, 09:57 PM #1
- Join Date
- Apr 2006
- Lancaster, CA
- 1998 GMC K3500 Crew Cab
Gears & Gas
This is my first post on this site! Just so happens, also for the first time, I paid $3.00 plus a gallon for regular gas. These "firsts" are related.
I drove my truck back & forth to work this week, as my Jeep is on blocks. That pickup is typically used to haul my slide-in camper, but when empty, it also serves as my backup daily driver. As it works out, the Jeep is so reliable that the truck battery often goes dead from non-use! Anyway, on Thursday, it cost me $75 to fill up the truck, which is a:
1998 GMC K3500 Crew Cab 4wd 454 cid (7.4 liter) automatic, 4.10 rear differential, with single rear wheels (not a dually).
All this yields a 10.0 to 10.5 miles/gallon average
I'd be interested to hear anyones' story based upon their experience of how changing the differential ratio affects fuel mileage. RPM differences are fairly straight-forward to calculate, but I wonder what people actually gained (or lost) in MPG after modifying their differential.
If the goal is better mileage, do you think modifying the differential is worth the effort?
04-26-2006, 04:37 PM #2
A lot of it depends on your driving. Your driving habits will increase your gas milage more then changing your diff around.
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