Question about 1996 Chevrolet K2500
I have a 1996 Chevy C2500. My differential has the full floating axle 8 lug i believe it has 4.11 gears i would like to have 3.7 Can this be done without changing the whole rear end? I get terrible gas mileage and do alot of driving.
Yes, you can leave the axle housing installed, but you will have to pull the axle shafts. You will likely have to purchase a specialty tool to do this.
(If you have the massive drums found on the 3500s and some 2500's, this would also be a good time to re-grease your bearings and check your rear brake shoes and change them if worn beyond 50%, since you will have the axle ends taken apart. These drums are very heavy. Do not remove the trapped bearing from the drum.)
To go from 4:11 to 3:73, You only need to swap out the gears in the differential (including the pinion gear) Be sure to check for proper alignment and backlash. Re-install axle shafts. Replace, do not reuse any seals. You may also need to reprogram the trucks shift points for the new gear ratio to maximize efficiency results.
Note: By changing your gear ratio to 3:73 You may potentially decrease your trucks Towing/Hauling weight capacity. Many GM trucks are equipped with an Eaton mechanically locking rear (RPO code: G80). You can find out if yours is so equipped, by checking the label inside the glove box. Personally I prefer the G80.
(I have the 3:73s in My '97 C2500 and average around 10.5MPG city, but long freeway runs can hit 15+MPG. My GVW is 8600LBS, and 10,000LBS Towing capacity. "Stop & Go" driving is your worst enemy with these trucks.)
Consider if all the work involved is worth it in performance gains before going forward.
Posted on Dec 06, 2009
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Posted on Jan 02, 2017
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