How do I know if I got a 3 or 4 Series Carrier in my 12 bolt - Team Camaro Tech
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post #1 of 27 (permalink) Old Oct 17th, 02, 05:41 PM Thread Starter
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How do I know if I've got a 3 series or a 4 series Carrier in my 12 bolt, It is presently complete, I havent taken it apart yet to find the ### on the carrier, but the gears are 4.10 GM, the part number is 3862526, is there any way of tell, without part numbers?? The code on the axle housing is QY, a 67 mono-leaf 12bolt with radius rod.

Thanks
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post #2 of 27 (permalink) Old Oct 18th, 02, 05:32 AM
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After 34+ years its hard to tell if factory or aftermarket. I believe 4.10's could be had on either if aftermarket.One way to know for sure.

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post #3 of 27 (permalink) Old Oct 18th, 02, 09:06 AM
 
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You would have to measure the flange height to determine what series it is with out part numbers.
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post #4 of 27 (permalink) Old Oct 18th, 02, 12:43 PM
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If memory serves me correctly a factory ordered 4:10 came with the series 4 carrier.
A later dealer swap got you the same gear with a spacer. I have one of those setups broken down in the garage.

Steve
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post #5 of 27 (permalink) Old Oct 18th, 02, 12:46 PM
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Factory 4.10 gears were on the 4 series differential. How did you get the number off of the gear if you didn't take the cover off? If you have the cover off the casting number on the differential case can be seen. It will be on the opposite side from the ring gear next to the bearing. The 3 series is EDB-30140 and the 4 series is EDB-30174.

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post #6 of 27 (permalink) Old Oct 18th, 02, 03:22 PM Thread Starter
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Hi,

I had the cover ripped off, on the ring gear it reads:

2 GM 3862526 10 41 4 70

on the opposite side from the ring gear next to the bearing. It reads ED-30140PU1 So does this make sense? a 3 series carrier, but factory 4.10 gears...

Thanks
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post #7 of 27 (permalink) Old Oct 18th, 02, 03:28 PM Thread Starter
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Also, the bearing cap/cover, whatever its called, has this number:

GM105 3858703N

I was a little hard to read,

Thanks
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post #8 of 27 (permalink) Old Oct 18th, 02, 05:15 PM
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You have a 4:10 gearset. I am guessing it was probably made in April 1970. If there is a shim about 5/16 thick between it and the flange on the carrier it is a series 3. If there is no shim its a series 4.

Steve
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post #9 of 27 (permalink) Old Oct 18th, 02, 05:43 PM
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The 30140 is a 3 series. It has to have a ring gear spacer in it. There is no other way you could have a GM 4.10 gear on a 3 series differential.

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427/4spd/9"
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post #10 of 27 (permalink) Old Oct 18th, 02, 09:59 PM Thread Starter
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I want to post a pic, of it, but dont know how, so I will email you guys a pic of my carrier, I honestly know nothing about rear axles. And I want to get rid of the 4.10 and install 3.55, thanks for all the info, There are some shims in place, as far as the spacer goes, I dont know, I will take another look..

Thanks guys
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post #11 of 27 (permalink) Old Oct 19th, 02, 05:01 AM
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You have the correct carrier. All you need is the 3.55 gear set.

Steve
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post #12 of 27 (permalink) Old Oct 19th, 02, 05:21 AM
 
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Could he not have the 'thick' ring gear 4:10 set? Or is the thick one that fits a 3-series an aftermarket-only piece? The thin one fits a 4-series for only sure, unless used with a spacer.
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post #13 of 27 (permalink) Old Oct 19th, 02, 06:38 AM
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I have not seen a thick GM 4.10, but that doesn't mean there isn't one. If it is a thick GM gear I would like to see it.

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post #14 of 27 (permalink) Old Oct 19th, 02, 09:42 AM
 
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Me too..
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post #15 of 27 (permalink) Old Oct 19th, 02, 01:21 PM
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There is a "thick" gear but GM didn't market it. His part number is correct for the standard 41 ring gear. I have a setup just like his on the shelf in the garage. What is most likely confusing him is that the ring gear spacer machining may be such that it looks like its part of the ring gear. GM, to the best of my knowledge, never made them and you had to go to your speed shop for one. The OD on mine is a little ratty so there is no problem making it out but if it had a course feed finish on it, after some years of use, it would look like part of the ring. Richmond makes a thick gear. Look in Jegs or Summit. The Jegs # for the thick one is 836-49-0304-1.

Steve
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