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Old 07-30-2009, 08:06 PM   #1
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help i screwed up on gears

I just finished installing 3.73 gears pulling out they feal great but when you let off the gas it sounds like the rear end is coming out on the jack stands it ran great no noise .005 back lash any ideas
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Old 07-30-2009, 08:52 PM   #2
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Re: help i screwed up on gears

first make sure the noise is coming from the gears
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Old 07-30-2009, 08:55 PM   #3
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Re: help i screwed up on gears

i have when i let off the gas it grinds and crunches sound real bad I'm starting to think i didn't get the crush sleve crushed enough ?????
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Old 07-31-2009, 03:47 AM   #4
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Re: help i screwed up on gears

I've never installed gears (let me say that first of all), but I was just going to say check the crush sleeve. I've heard that installing it incorrectly can cause many problems. What it came down to, I believe, is that you need a torque wrench and a breaker bar for it since under tightening it or over tightening it will ruin the whole install.
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Old 07-31-2009, 09:07 AM   #5
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Re: help i screwed up on gears

they are not installed correctly, I personally dont know how to do it... but if all the parts are new (not used) then its installer error.
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Old 07-31-2009, 06:34 PM   #6
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Re: help i screwed up on gears

I took it to a dealer and in the back yard there was no way to get the croush coller compressed in the back yard i yanked my guts out and could not get it they said i did everything right except for having the *** to get it with out a three foot cheater learned my lesson i love doing things my self but on jacks in the yard is not the way to do it.
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Old 07-31-2009, 07:01 PM   #7
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Re: help i screwed up on gears

Well, I give you credit for attempting to do it. I love working on my car, but no way in hell would I try and install that ****. How much did the dealer charge you afterwards?
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Old 08-01-2009, 02:28 PM   #8
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Re: help i screwed up on gears

waiting to find out
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Old 08-01-2009, 03:16 PM   #9
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Re: help i screwed up on gears

To set pinion preload you need an impact and an inch pounds with a needle not the click style. On a 7.5 rear it needs 25 inch pounds of rotational force.

You need to know what you are doing to install gears.

I will be doing a gear swap on my dads truck in a few weeks. I will have rob there to take pics and so a wright up on it.
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Old 08-01-2009, 03:39 PM   #10
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Re: help i screwed up on gears

the impack with my compressor with 125# air pressure wasn't enough
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Old 08-03-2009, 10:12 AM   #11
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Re: help i screwed up on gears

also note on the newer 8.8's the range of tolerance is much tighter than on older 8.8s
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Old 08-06-2009, 06:35 PM   #12
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Re: help i screwed up on gears

well i'm back up and running " SWEET" learned a lot like a slinger looks like a shim and you can't crush the sleve in the back yard
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Old 08-06-2009, 06:36 PM   #13
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Re: help i screwed up on gears

i will have to work on wheel hop now any ideas ???
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Old 08-08-2009, 01:55 AM   #14
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Re: help i screwed up on gears

final cost $497 but i learned alot
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Old 08-08-2009, 01:57 AM   #15
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Re: help i screwed up on gears

Yea on the new 8.8 crush sleve the dealer said he uses a vice to start the crush sleve before he installs it
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Old 08-08-2009, 11:11 AM   #16
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Re: help i screwed up on gears

wheel hop is fixed by locating the rear axle sideways and front to back firmly, so removing all the nasty bushings and eliminating the upper control arms... but most dont have to go that far to get good results. Lower control arms and stiffer springs may work good for you (with shocks valved for the springs)
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Old 08-08-2009, 12:13 PM   #17
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Re: help i screwed up on gears

ok i don't know if i understood that ?
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Old 08-14-2009, 01:08 PM   #18
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Re: help i screwed up on gears

glad you got the rear done !! Yeah without the right press your pretty much screwed those crush collar are a *****
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Old 08-14-2009, 01:31 PM   #19
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Re: help i screwed up on gears

remember its gonna run differently on jack stands than it will on the ground
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