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.
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.
'69 RS/SS396 pro street
High Performance Drive Train Parts And Service www.lubedealer.com/biggearhead
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.
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..
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.