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Discussion Starter #1
Now that I have the lift done, I am thinking about re-gearing in the future. I know there are a ton of threads about gears, but I couldn't find a direct answer anywhere.

Someone told me that starting around '10-11 GM changed the carriers and now they won't work with any gears above a 4.10. First, is that true? Second, I plan on 4.88's so if that is true, will I need a new carrier for the front and rear or just the rear?

From what I have been reading it seems like the TrueTrac is the way to go. I don't know a ton about lifted trucks, so all of this is pretty new to me. Sorry for all of the questions, I just want to make sure I get everything ordered right the first time around.


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Not sure about your carrier but I have 5.13's in my 04 and I didn't need to change anything. Do you off-road with your truck? I've heard great things about the tru trac but my truck is a pavement princess and I didn't wanna dump $400 on a new locker since my g80 has zero issues.
.....just a thought to consider
 

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Discussion Starter #3
Mine is hardly ever off road. I originally had no plans to change the carrier someone mentioned that the new gears wouldn't fit. If that's not the case, then i definitely won't be changing it.


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Discussion Starter #6
So what are your thoughts on 4.88's vs 5.13's? The more I read, the better the 5.13's seem.


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Discussion Starter #8
35's now, but definitely moving to 37's in the future. The lift gave me way more clearance than I expected.


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Discussion Starter #9
So after looking at the RPO codes, it seems like I have 3.08's now rather than the 3.42's I thought I had.


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you can get away with 4.56's but 4.88 and 5.13 are a better choice. FYI, your truck will feel like 200hp was added to it after you re-gear. Those 3.08's are gutless with stock tire no the less 35's.
 

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Discussion Starter #11
Nice. I'll probably do 4.88 to be safe. Just got a quote from Randy's... May shop around a bit. Haha


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try rons machine service . net...... he gives great prices
 

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The Canadian
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If you don't do much high speed highway driving, 5.13's way to go. especially with a good tune & 37" tires.
 

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Discussion Starter #15
The truck sees less than 400 miles a month, so daily driving and highway aren't a concern at all.


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The Canadian
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The truck sees less than 400 miles a month, so daily driving and highway aren't a concern at all.


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5.13's all the way. Make sure you get a good tune. You have 6 speed correct?
 

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The Canadian
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I do have a 6 speed. And I'm thinking about a black bear tune.


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you NEED a tune after going gears of that big of a jump. And 6 speed, 5.13's, 35/37's with a BB tune. Will net exponential result.
 

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Discussion Starter #19
Sounds like that would be perfect. I'll have to talk to someone at BB and see what my options are.


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