Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum - View Single Post - Changing out differentials
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Old 06-09-2019, 11:13 PM
donnieb donnieb is offline
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2007 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Jan 2019
Location: Santa Barbara, CA
Posts: 9
Changing out differentials

I've got the 2007 4.2L TB with the 3.42 rear end (and front) and recently did a "maiden voyage" towing my 2011 Lance Model 1685 Travel Trailer, which in my case, weighs about 4000-lb loaded. The TB did fine on flats and gentle climbs, but I hit a steep grade on Highway 1 heading toward Lompoc, CA, off of the 101, and the TB wouldn't haul faster than about 35-mph! In second gear. Damn. I'm planning some trips all over the Pacific NW and will certainly hit some serious grades.

So I have options: buy a more powerful V8 vehicle, such as a Suburban, Tahoe, or similar. Or, I am looking into changing out the ring gears on the front (carrier) and rear differentials to the 4.10 ratio. That would give me another 1000-lbs of towing capability, and would keep the engine in the power band going up grades (or so I think).

The gears are not that expensive, and even though I can handle a wrench confidently, I don't have a lift, so would spend a lot of time under the vehicle.

Anyone have any experience doing something like this? (Or just dropping in a used front carrier)
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