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post #1 of 24 (permalink) Old 10-03-2009, 02:46 PM Thread Starter
 
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Detroit TruTrac mod

This was a mod I was hoping could wait till the spring but....

Ever since I put the 2" drop shackles on the truck theres been this bouncy feeling to the rear, almost as if the tires were egg shaped but I checked the tires and they are fine.

The plan was to install some 2 degree pinion shims since driveline vibrations can sometimes happen after a drop. Since I no longer have my friends garage to work in since he moved I had to take it to my mechanics. After the truck was up on the lift for a few minutes we found that the pinion angle is only off by 0.5 degrees so no need for the shims. He said he would put them on but that would not solve the issue. He suggested we take the rear diff cover off and look inside, no charge for the look or fluid refill.

Good thing we checked, the spider gears were all pitted and one of the cap bearings was cracked in 3 places and had almost 3/8" of play. I asked if it would last till spring and he said it could go another 10000Kms or it could go on your drive home.

So after thinking how big a hit to the wallet this is to fix now or to fix later if it breaks while driving I said ok lets fix it.

Bye bye open diff and 3.08 gears and hello TruTrac LS and 3.73 gears.









Only thing is there was no clocking gear for the ABS so now I am without RWABS but I can live with that. Now all I need is to get a new speedo gear cuz its waaayy off. I tried that link that Skrwz posted in another thread and gave them a call but I still need to know whether I have the 7 or 8 tooth drive gear and seems the only way to check is to take it apart. I tried but I couldn't get it out. I have to go back to the mechanics on Friday to let him check over the rear diff to make sure things are still ok.

One thing I found is that when you let off the gas and coast you can hear the
rear whine. He said because its gear driven there will be some whine. I'll get more info on that next week.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]

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post #2 of 24 (permalink) Old 10-03-2009, 04:54 PM
 
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How big a difference in acceleration is there from 3.08 to 3.73? Been wanting to do this forever but hate to money out when a 2010 looks better lol. Also i think the whine will go away after a few hundred miles. Could be wrong but I have heard that.
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post #3 of 24 (permalink) Old 10-03-2009, 06:16 PM Thread Starter
 
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I'm still in the break in phase so I've been easy on it but it does feel like its faster but that may just be in my head. Only sure way to know is take it to the track but I need to put about 400kms on it first, only up to about 150 since Friday.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
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post #4 of 24 (permalink) Old 10-03-2009, 06:17 PM
 
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the whine is not a good thing! Should be no noise



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post #5 of 24 (permalink) Old 10-03-2009, 08:19 PM
 
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Quote:
Originally Posted by taisa899 View Post
the whine is not a good thing! Should be no noise

Correct, sounds like an improper set up some how


BTW, I'm almost 100% you have a 8 tooth drive gear

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post #6 of 24 (permalink) Old 10-03-2009, 09:24 PM
 
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that whine you're hearing is the gears grinding on each other.



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post #7 of 24 (permalink) Old 10-05-2009, 01:55 AM Thread Starter
 
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Cool, thanks Dave. I will be going back Friday to have him recheck everything. I'm going to be calling Eaton themselves to ask if there should be any whining sounds at all. Thanks for the info guys.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
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post #8 of 24 (permalink) Old 10-05-2009, 02:48 PM Thread Starter
 
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Update. I spoke with Eaton directly and they said 99.9% that the reason I've got the noise is because they used synthetic diff fluid. They said only use conventional. Was told it will make a small amount of noise when turning but other than that there should be no noise if the gears are setup properly. Also that its possible to take the exciter gear from the old rear diff and install it on the new one so the ABS will work. I called the shop today to make sure they still had my old parts, which they do, so this should be getting fixed tomorrow.


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
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post #9 of 24 (permalink) Old 10-05-2009, 04:14 PM
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sweet so we gonna see you friday night at the track then man
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post #10 of 24 (permalink) Old 10-06-2009, 01:40 AM Thread Starter
 
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If its running right most likely. I checked the Hayne's manual and it says the recommended rear diff fluid is 75w140 GL-5 synthetic but they guy at Eaton said not to use synth. I guess the recommended fluid is for the stock parts?


Whaddya mean I dont pay my bills?? Whydya think I'm broke!!

03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]
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