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post #1 of (permalink) Old 08-31-2001, 08:10 AM
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Rear end gear ratio changing

I just got my new 12 bolt rear end under my truck but I have thuroughly decided the 3.08 gears suck. In Summit a set of 4.10 are $191. How hard and what all is invaled in changeing these out? TO me all it looks like is to take the center pin out to slide the axels out a little bit then take the 4 bolts that hold it in off then take the yoke off then put the new frot gear in and put the yoke back on then put the new ring gear on then put back together. Is it pretty easy? The front I am going to leave to a shop to do I think. Thanks..


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post #2 of (permalink) Old 08-31-2001, 09:03 AM
 
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Re: Rear end gear ratio changing

You need to know the new pinion depth to shim new pinion, set the case bearing preload, and adjust the pattern on the new ring and pinion. Its not a job for beginners, although basic mechanical skill can get through it. Take your time if you decide to do it yourself. Once you set a bad pattern on the gears, the whine just gets worse, and your new gears will be shot.

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post #3 of (permalink) Old 08-31-2001, 09:14 AM
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Re: Rear end gear ratio changing

Do you know of any manuals or website that explains how it is done? I am fairly mechanical but I have never changed a gear ratio before. Is there any particular kind/brand of gears to get? Summit has the Richmond for about $200 then you can get the install kit for $100


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post #4 of (permalink) Old 08-31-2001, 09:23 AM
 
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Re: Rear end gear ratio changing

I heard US gear is the way to go. They will replace the gear sets even if you set them up wrong. Look for a factory manual to get the set up numbers and step by step instructions. You will need a dial indicator with a magnetic base.

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post #5 of (permalink) Old 08-31-2001, 09:30 AM
 
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Re: Rear end gear ratio changing

oh yeah, if the shimming is off, it'll howl like a banshee at higher speeds. mine does this right now. and i have a wicked shimmy. the pinion nut backed off cuz the dude at the shop never put lock-tite on in....so now I"m phucked
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post #6 of (permalink) Old 08-31-2001, 11:43 PM
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Re: Rear end gear ratio changing

If you set up the rear end, you can set up the front end, its done exactly the same way. Assuming your talking about the truck in your sig.

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post #7 of (permalink) Old 09-01-2001, 08:53 AM
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Re: Rear end gear ratio changing

Ya, it's the same truck, the '86. I was just told the front it bear but they might have been talking about IFS or something. I think I'll try th back first then next pay check do the front if the back end went ok. Thanks for the input


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post #8 of (permalink) Old 09-01-2001, 04:02 PM
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Re: Rear end gear ratio changing

u4ia4, if their bad work is the reason for your problem, it seems to me that you could just take it back and bitch until they fix it or get it fixed. Am I missing something?

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post #9 of (permalink) Old 09-07-2001, 11:31 AM
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Re: Rear end gear ratio changing

I was looking at 4 wheel parts and they have 4.10 for the 12 bolt for like $140 or $190 for thick gears. What is the difference between the two? Also the install kit is somewheres arounf $40, I take it that is pretty necessary too sinc eI don't have anyhting that kit comes with. Any other advice for installing the new gears? Thanks.


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post #10 of (permalink) Old 09-07-2001, 03:56 PM
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Re: Rear end gear ratio changing

The setup kit from US Gear comes with all the shims, bearings, marking compound, etc. needed to set up your gears. It costs around 100 bucks.

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