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  #11  
Old 09-27-2010, 01:28 AM
RootBeer RootBeer is offline
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3.21 to 3.92 is your best bet. 4.10's are a bit much for a daily driver unless you intend to race it.
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Old 09-30-2010, 06:22 PM
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Quote:
Originally Posted by smokinjoe72 View Post
I am going to change out my diff very soon. My '10 came with 3.21 and I tow 7K lbs. The best way is purchase the carrier, no clearances to set. Just pull the axles and install.

Used carriers are about $600 rear. Front carriers are even cheaper.

Anyone have thoughts on if the 4.10s are the way to go or will my MPG suffer when not towing (only tow one weekend p/mth).

FYI, I towed with the 3.21s and it was just brutal - as I knew it would be. 8.1 mpg
You may want to double check this. Third members, like those found in 9" and toyota rear ends can be swapped like this, but not a conventional differential. You can't just replace the carrier, the ring gear and pinion gear are a matched set. Anytime you change the carrier, ring gear, or pinon gear, you have to check the pinion depth, gear mesh, and backlash. A thousandth of an inch difference in the machining can make a huge difference in the life of the gears.
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Last edited by Wildcat; 09-30-2010 at 06:26 PM.
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Old 10-02-2010, 02:32 PM
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well I changed mine from a 3.21 really bad in the rain but ok then I put truelocker in it and 4.10s so much better the tiers grap at the same time it feels gets up and goes only problem is my 4.10 s hum 40 to 70 mph not alot but radio off you here it all the time. went to a shop were I did a axle years ago wish I would have got the grears from them but saved 250.00 on them and the dealer was 700.00 for the same grears I was told ! may go 90w dont have snow here so maybe better for towing pulls like crazy dont even have to floor it hope this helps ! oh looks like I lost 1 mpg get 11mpg to 18.6 was the highest with my 4.10 s !
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