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Old 01-11-2006, 09:00 AM   #1
BigBlackQC
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Default 4.10 gear swap

So, I think I've decided to swap my 4.56s over to 4.10s. Is anything else required for this besides:
1) A set of 4.10 gears
2) Gear Lube/Oil
3) Bottle of friction modifier
4) RTV sealant for the housing cover

Do I need a new carrier or anything like that? From what I've found, the differential cover just uses RTV as a gasket, is this right?
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Old 01-11-2006, 10:43 AM   #2
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Yes you will need a new carrier also. If you are interested I have the factory 4:10 gears and carrier from my truck, they have about 3000 miles on them and are in perfect condition. PM me if you are interested.

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Old 01-11-2006, 11:16 AM   #3
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There should be quite a few 4:10s available because many of the '04 guys swapped them out for the 4:56s. It might be wise to check with some of them before you do the swap. Most of them thought the 4:56s were an improvement.
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Old 01-11-2006, 11:17 AM   #4
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And also a micrometer to set the backlash and know how to set the tooth contact. Not a unbolt old ones and bolt in new ones deal.
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Old 01-11-2006, 01:20 PM   #5
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Thanks Joe, got two micrometers, digital and analog, I've done two gear swaps before, one on a 1991 GMC Sierra 1500 and the other on a 1984 Vette, but always try to do as much research as I can before I start turning bolts, otherwise I get my a** in a bind pretty quick.....

Anything else that I might be forgetting?
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Old 01-11-2006, 01:52 PM   #6
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Cool. Just making sure. I've had to redo a couple b/c people didn't realize that.

While you're changing the carrier I'd put a better limited slip in there if not a locker of some type.
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Old 01-11-2006, 02:27 PM   #7
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are you doing this mod for better mileage? I might be interested in doing it as well.
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Old 01-11-2006, 03:59 PM   #8
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Quote:
Originally Posted by BigBlackQC
but always try to do as much research as I can before I start turning bolts, otherwise I get my a** in a bind pretty quick.....

Anything else that I might be forgetting?
You're a smart man

I assume if you've done gear swaps before then you have access to bearing pullers and a press? Keep your fingers crossed that the carrier doesn't need to be shimmed or you may need new side carrier bearings. You will also need new pinion bearings, pinion bearing preload shims and pinion depth shims from a 04 rear end. The pinion shaft diameters are different between the 4.56 and 4.10 gear sets.
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Old 01-11-2006, 04:20 PM   #9
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I've also got a set of 4.10's that I replaced at ~4,000 miles. Perfect.

PM if interested.
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Old 01-11-2006, 05:02 PM   #10
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Be sure ot post and let us know if there is any difference in pulling or mileage please, been pondering this myself, jsut havent had the time.
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