3 series vs 4 series carrier - how to distinguish - Team Camaro Tech
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post #1 of 10 (permalink) Old Nov 13th, 07, 05:15 AM Thread Starter
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Greg
 
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3 series vs 4 series carrier - how to distinguish

Just as the header says, on a 12 bolt 4.56 Posi, how do you distinguish between a 3 series carrier and 4 series carrier with the cover off?

I understand that it is more than likely a 4 series due to the gearing, but would like to validate 'more than likely'.

If anyone has pictures of the two that would be great. I don't see any brand name on the gears, just '41 9' (for the tooth count of ring/pinion) and USA. There were some numbers on the side of the carrier, that are hard to see, I did not write down.

Thanks in Advance!

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post #2 of 10 (permalink) Old Nov 13th, 07, 05:38 AM
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Re: 3 series vs 4 series carrier - how to distinguish

If it's got 4.56 gears on it and it's installed in a housing, it sure isn't going to be a 3-series carrier unless you've got a spacer or a real thick gear. The break is between 3.73 and 3.90, and you're well over that. You might call West Coast Differentials, they'll have all the numbers you need. 800-510-0950
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post #3 of 10 (permalink) Old Nov 13th, 07, 06:22 AM
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Charlie
 
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Re: 3 series vs 4 series carrier - how to distinguish

The way it was told to me, anything over a 3.90 gear uses a 4 series carrier. Below 3.90 uses a 3 series carrier.

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post #4 of 10 (permalink) Old Nov 13th, 07, 07:49 AM
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Ron
 
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Re: 3 series vs 4 series carrier - how to distinguish

You can buy 4.11 and 4.56 gears to fit a 3 series carrier withiut a spacer.
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post #5 of 10 (permalink) Old Nov 13th, 07, 08:02 AM
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Tom
 
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Smile Re: 3 series vs 4 series carrier - how to distinguish

You can also buy 3.73 gears for a 4-series carrier. Strange engineering has an excellent photo on how to tell the difference between a 3 and a 4 series carrier. Their catalog is at this link...http://www.strangeengineering.net/catalog/index.html goto page 26 in their catalog.

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post #6 of 10 (permalink) Old Nov 13th, 07, 08:07 PM Thread Starter
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Greg
 
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Re: 3 series vs 4 series carrier - how to distinguish

Mystery Solved!

Thanks for all your inputs.
TJS69 that picture was spot on what I needed to comprehend.

I made the measurements, and immediately (since I knew what to look for now) spotted a crude, machine stamped spacer. The spacer measured ~.300, and had machining stamp scars on the OD. The ring gear and carrier were smooth. The carrier measured 1". The spacer is sandwiched between the carrier and ring gear. The measurements are indictative of a 3 series carrier.

I also was able to read the carrier number - EDB 30140...just googled that, and it is jumping out on several forums as a 3 series carrier. There are also references to the spacers with OD scars.

So good news for me, I can buy the gearset I really want (3.55) and use my old carrier!!

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post #7 of 10 (permalink) Old Nov 13th, 07, 08:12 PM Thread Starter
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Greg
 
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Re: 3 series vs 4 series carrier - how to distinguish

And now for a more realistic pic


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post #8 of 10 (permalink) Old Nov 14th, 07, 12:33 PM
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Re: 3 series vs 4 series carrier - how to distinguish

I miss B.G.H. !!!
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post #9 of 10 (permalink) Old Nov 14th, 07, 05:43 PM
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Re: 3 series vs 4 series carrier - how to distinguish

When you have the carrier out, use BraKleen and clean out the oil passages, the two holes outboard of the bearing caps, and clean out the sediment.

Along with the cover, see the groove, the ring gear splashes oil into these passages and lubes the carrier bearings. Over the years, the passages become restricted.

I don't know if the dealer sells them any more, but get a set of 75 lb springs, yellow in color to replace the 50 lb. green springs. These new springs will make the carrier act like a spool.

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post #10 of 10 (permalink) Old Nov 14th, 07, 05:53 PM
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Re: 3 series vs 4 series carrier - how to distinguish

last 3 digits of a 3 series are ....140 last 3 digits of 4 series are...174. This is from memory but i believe is correct.
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