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Old 05-12-2010, 01:30 PM
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Aftermarket gear idenification

I know zero about gears or idenificating them so i will put it all on here. on theend of the pinion gear theres a 3 C. in the mkddle it says k 41xl1

outside of the ring is 125944 and upside down 90 ?lxl7 . They are made of steel.



I can get more pics if needed? I bought everything pictured for 75 was it worth it? Plus i bought a 2 series carrier posi for my nova and i am using a motive ring spacer should i have anyproblems if i am putting 370 to the ground and dont have slicks or radials but i am also doing either traction bars or something like ladders

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Old 05-12-2010, 07:41 PM
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What is it that you want to know about the gears? Looks to me like it's a 8.5 10 bolt gear. Is it new or used? If it's new then it's well worth $75, but if it's used then it's questionable because you don't know if they were set up right the first time. If they were set up wrong then they will have a bad wear pattern to them and might make noise.

A ring gear spacer is not a good idea. There are too many problems that go along with them. I've seen many gears ruined from using a spacer. If it's the best that you can do then go with it. Maybe it will work out for you.
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Old 05-12-2010, 09:57 PM
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They are used but the pattern looks good, they have some miles but they were set right in the rear end. I was just wondering if you knew the brand and if theres a way i can positive match these to be sure it a 8.5, The spacer will have to work as it is my only way to get both wheels to spin. Its a one year fix i am building a ford nine inch with a 390 gear that will go in the nova for good. Plus as long as i dont put 400 hp down and also no slicks
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Old 05-12-2010, 10:16 PM
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Looks like 8.5", maybe stock GM factory take out's?? Somebody putting 4.56's in a mid 80's 4x4 would be taking these out?? My '84 1/2 ton has two sets from the factory

I'd use ARP ring gear bolts with the spacer if you can.

Should work as long as you know it is a 1 year fix, it could last longer but don't expect it to last forever, especially if you abuse it.
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Old 05-13-2010, 05:54 AM
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Measure the diameter of the gear. It should be close to 8 1/2 inches and it should have 10 bolt holes for 7/16 bolts and left hand threads. It looks like a Yukon gear. Only after market gears have the extra sholder for the speed sensor reluctor ring, so this wouldn't be a GM truck gear. If it was a GM gear it woudl be marked that way.
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