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  #1  
Old 11-30-2012, 09:03 AM
fxdrider fxdrider is offline
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Default Ring and Pinion Ratios - 3.92 vs. 3.90?

My 2003 Laramie with less than 106,000 miles on it is getting it's rear end rebuilt next week. That's pretty messed up, considering the low mileage, and for about half of those miles it's been driven like a grandma! The first 58000 I can't account for, since I bought it used. The truck didn't look like it had been beat at all. But that's a whole different topic - rant, if you will.


Basically, I'm planning to have just bearings and seals done at this point. Won't know if there's any damage to any of the gears until it gets opened up. It's got the stock 3.92 gears in it. In looking around for replacement ring and pinion sets, it's tough to find one that's 3.92 - most of them are listed as 3.90, with a few listed 3.91. What's up with that? If the factory gears are 3.92, why don't the aftermarket manufacturers make there gears 3.92? If I put a 3.90 gearset in, will I then have to replace the ring and pinion in the front diff as well? Or is that too close to matter?

Trying to avoid the high price tag of the OEMs if possible.
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Old 11-30-2012, 09:06 AM
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What shop did you end up going with? If you don't mind me asking
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Old 11-30-2012, 09:19 AM
fxdrider fxdrider is offline
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All Tech Transmissions - they're on Cromwell, out 610 a ways in Fauquier County.

http://www.alltechtransmission.com/index.php

They came with good recommendations, they're not far from me, and they were willing to tear it apart and replace just what it needs. Most shops I spoke with don't want to work on a differentials - try to steer you towards a used rear axle assembly from a salvage yard.
I didn't get around to Eddie's, like you recommended in the other thread. Always had them in the back of my mind, kinda holding them in reserve I guess.

Last edited by fxdrider; 11-30-2012 at 09:22 AM.
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Old 11-30-2012, 09:26 AM
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Oh right, I know that road. Hmm didn't know there was a shop out that way. Well it seems like a good choice..i mean it's a transmission specific shop so probably better than Eddies actually. Eddies is just a general repair/service shop. Hope everything works out for ya.
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Old 11-30-2012, 09:48 AM
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The difference in advertised ratio is too close to matter. I notice that you said that the first 58k on the clock are unaccounted for so that means that it could have went that long without a fluid change and you also didn't mention servicing it since you bought it. Even being babied, that's way, way too many miles on a diff without a fluid change. I think most of independent shops don't want to work on differentials because they simply don't have the training to properly rebuild a rear end. For some reason people seem to think there's some black magic involved that only a gifted few can perform, but it's no more difficult that building an engine.
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Old 11-30-2012, 10:16 AM
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Quote:
Originally Posted by RamTech View Post
The difference in advertised ratio is too close to matter.
I figured as much but wanted to be sure.

Quote:
Originally Posted by RamTech View Post
I notice that you said that the first 58k on the clock are unaccounted for so that means that it could have went that long without a fluid change and you also didn't mention servicing it since you bought it. Even being babied, that's way, way too many miles on a diff without a fluid change.
Wow. I didn't realize that. I've got the service records from the dealership where the original owner took it (and where I bought it) and while it mentions plenty of motor oil changes, it doesn't mention any differential service, so maybe not. I see the manual says every 30,000 miles if you drive under "schedule B" conditions, which I think most of us do. One of those things I meant to get to, but never did. Guess I will now.


Quote:
Originally Posted by RamTech View Post
I think most of independent shops don't want to work on differentials because they simply don't have the training to properly rebuild a rear end. For some reason people seem to think there's some black magic involved that only a gifted few can perform, but it's no more difficult that building an engine.
From what I've read on the subject, it doesn't seem like it would be all that hard to do. I actually considered trying it myself - for a moment. The problem is this is my daily driver, and I don't have experience with diffs or the proper measuring tools. If it were a project vehicle, I might consider it. So, I figured it would be best left to the pros.

Thanks.
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Old 11-30-2012, 10:35 AM
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My personal recommendation is to change the fluid at 30k and that's the interval I use for my own truck. You're right about building a diff not being that hard. It really isn't, but a few special tools are needed which, in my opinion, wouldn't be cost effective for the average do-it-yourselfer to purchace for one time use.
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Old 12-02-2012, 02:24 PM
Gen1dak Gen1dak is offline
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Keep in mind the OEM's tend to run quieter. Randy's Ring and Pinion even recommends OEM for van installations. Some types are softer, intended more for drag racing, others are harder for higher mileage durability.
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Old 12-02-2012, 05:07 PM
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Quote:
Originally Posted by Gen1dak View Post
Keep in mind the OEM's tend to run quieter. Randy's Ring and Pinion even recommends OEM for van installations. Some types are softer, intended more for drag racing, others are harder for higher mileage durability.
I remember when I first brought the truck home, it was quiet, except for a little tire noise - you would've thought you were riding in a Cadillac. I don't really mind a little bit of noise, as long as it's a noise that's normal. Since I know how quiet it CAN run, any new noise is really noticeable. I figure, if it's a noise that wasn't there before, it probably isn't a good thing.
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Old 12-04-2012, 06:08 AM
fxdrider fxdrider is offline
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Default UPDATE:Ring and Pinion Ratios - 3.92 vs. 3.90?

My mechanic called yesterday with good news!!! (How often do ya ever hear THAT!?) After thorough bench inspection of the internals of the truck's rear end, the stock gearset is fine! He said there are no signs of wear at all! The noise I was hearing was the front pinion bearing starting to come apart. So, he replaced all of the bearings and seals, including the ones for the rear wheels, and it's going back together. Whew! I'm just giddy at the thought of NOT having to spend several hundred more $ for a ring and pinion set or worse!

Woo-woooooo!!!!!!!!

Sorry.
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