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Old 01-31-2011, 05:13 PM
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9 inch ring pinion installation kit?

I am looking to get a Ratech ring and pinion install kit from summit so i can have my mechanic set up some gears for me. I need a basic kit without new bearings. The problem is the the kits say for open or trac-lok, my differential has a Detroit locker? Also is there any way to know the carrier bearing size before i take the third member out? The center section is out of an 86 full size bronco and has 31 spline shafts if that matters. Thanks in advance.

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Old 01-31-2011, 07:27 PM
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I would like to talk you out of the Ratech kit. They are probably just about the worst kits that you can get.

If you need a kit without bearings then why do you need to know the bearing size? You will need to know which pinion housing you have. The standard housing uses a different inner bearing and spacer than the Daytona housing.
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Old 01-31-2011, 07:51 PM
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I needed to know the size because while narrowing my search on summit it asked what size the carrier bearing diameter was, even after i narrowed my results down to kits without bearings, so i didn't know if it was relevant in deciding on a kit. I'm assuming its not a Daytona style because it has raised portions around the bolt holes. Does it matter if the kit i buy is for an open rear or trac-lok? Mine has a Detroit but isn't listed in any of the kits. The kits just say for open or trac-lok.
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Old 01-31-2011, 08:07 PM
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The reason that it is asking if you have a standard diff or a Trac Lock is because the Track Lock uses different ring gear bolts. Your Detroit Locker uses the same bolts as the standard differential. You probably have the standard pinion housing. The diff bearings will be either 2 7/8 or 3 1/16. The 2 7/8 is the most comon in the stock cases, but if you are not getting bearings then it makes no difference.
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Old 01-31-2011, 08:50 PM
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Thanks for the reply
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Old 02-04-2011, 05:09 AM
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A little ot but what is wrong in ratech bearingsets?
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Old 02-04-2011, 04:41 PM
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The 9 inch kits are probably not that bad, but their 12 bolt and 10 bolt kits have junk shims in them, and I have seen mixed brands of bearings in them. The pinion nuts are usually some generic hardware store nut. I've had problems with their ring gear bolts too.
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