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Old 01-29-2003, 09:58 AM
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Talking Anyone changed a carrier gear?

Has anyone done a gear swap in the rear differential where you have to go to the next larger carrier gear?

I am wondering how expensive this gets.

I have (about) .331 now, and I'm thinking that .373 might not get me where I want to go. (heavy car, with a 327, I need more "go"-- you know the old story...)

if I get into the above .400 zone --where I'll need to replace the carrier gear--, that might rock.

Any advice for a greedy little bastard who craves more G-forces would be greatly apprecialted.


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Old 01-29-2003, 05:00 PM
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In a 12 bolt GM you need to go to a 4 series unit to use 410 gears
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Old 01-30-2003, 07:49 AM
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thanks for responding. Yes, my Impala has a 12 bolt.

can you point me to any tech articles about 4 series units or about carrier gear swaps in general? I realise it must get tiring telling us new guys the same stuff over and over.

On the other hand, if you're up to talking about it, I'm all ears (eyes?) : )

how pricey is that swap anyway?

thanks again for your help!
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Old 01-30-2003, 08:47 AM
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Wayout, Check the Summit racing catalog. There is a set of 4:10s for a 12 bolt that fit the 3series carrier. I used em in mine. (went from 3:31 to 4:10)
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Old 01-30-2003, 09:33 AM
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wayout: check with Randys ring & pinion. I just put a new posi unit in my 12 bolt car. I took the origional one out & replaced it with a new style Eaton. The flange thickness on the new carrier is the same as the old one. Iam sure you can buy gears at least up to 4,10 without changing your carrier. hope this helps.
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Old 01-30-2003, 12:43 PM
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wow. The automotive 'guru' I was learning stuff from for the last several years told me there was no way to get beyond 373 without changing the carrier gear.

is this something new? how does it work?
can I read a tech article about them anywhere?

Thanks for all your help so far!
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Old 02-02-2003, 05:16 AM
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It has been awhile since I changed gears in a 12 bolt rear,I went from a 3.31 gear to a 3.73 gear.I used a ring gear spacer,[about $15].I think there is 2 or 3 different carriers,the ring gear spacer moves the ring gear closer to the pinion.as you lower you ratio,the pinion gets smaller,I don't think you can go from a 2 series carrier to a 4 series carrier with a spacer,only can go from a 2 to a 3,or a 3 to a 4 series.Hope that this helps
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Old 02-03-2003, 09:02 PM
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thanks. my series 3 isn't posi anyway, so I think I'll just swap a posi 4 in and the 4:10's will be compatible. I was tempted to go to 4:56 but I *do* sometimes drive it at 70 mph, and it can cost ten dollars just to go visit a friend when you're burnin' dinosaurs that fast : D
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