Changing differential gears
WWould like to hear from those that have actually changed their rear-end ratios. Did you get any improvement? Was it worth it? Any pitfalls?
Forum Discussion
Huntindog wrote:
I have a 73 Blazer that I bought in 85. It had 3.73s. That reved pretty good with stock tires and the TH350. When the tranny went, I installed a TH700R4. A lower 1st gear, and an overdrive made this a great choice. It was my first TV. Then one of the front springs broke while I was towing. Made it home fine with it that way only discovering it when backing into the drive. Priced new stock springs....Ouch.
So ended up with all new 2.5" lift springs/shocks for a lot less $$$. Then the stock tires looked silly, so at new tire time, 32"s went on. Then the OD was too steep. Mileage went down a lot and OD wasn't much use. When it was axle rebuild time, I installed 4.10s front and rear with a Trutrac in the rear and an Auburn in the front. I did it myself.
Cost wasn't bad at all. It did take some time and a few new tools.
What a difference! Mileage improved by 29%!!
power was better in every gear.
So yes, if your present gears are not working for your situation.... Getting the right ones for the job will make a world of difference, and very well may improve economy as well.
I am positive that my initial cost has been returned and then some, over the last 10 years in fuel savings. The better drivability is a bonus.
Thanks. My CAT numbers are good. I was just looking to improve shifting and short hill climb performance.
