STEVE760
Bone Stock
Posts:18
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| 12/03/2004 9:46 AM |
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MY 04 CHEVY HD2500 HAS BLOWN OUT 2 FRONT DIFF.
IT HAS A 6" FAB-TECH LIFT ON IT.
IVE HAD IT INSPECTED BY 3 OUTSIDE INSTALLERS
AND ALL SAY LIFT IS INSTALLED CORRECTLEY
DEALER SAYS ITS THE LIFT CAUSING THE PROBLEM
WARRANTY DENIED
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Colorado Cruiser
Bone Stock
Posts:20
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| 12/03/2004 10:34 AM |
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| 6 in fabtech. Thats a big lift on that truck. where do you live. I work for a car dealership and can maybe help. |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/03/2004 10:46 AM |
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What is blowing out on the diff? Is it the bearings, the ring and pinion, the carrier, etc.?
Also, what size tires are you now running and what gear sets did you install (make/model, and gear ratio)?
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/03/2004 3:29 PM |
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| they havent yet determined what is causing the problem, they are stock
> gears. i have 35in tires and 16x8 rims
> ive had a second inspection done on the lift by and outside source and the
> determined that the lift is install correctly.
> any ideas
> thanks steve
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/03/2004 5:39 PM |
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Steve,
Here are some figures / facts / thoughts to consider:
The '04 2500 HD had the following gearset options:
Vortec 6000: 4.10 standard on all models
Vortec 8100: (opt) 3.73 or 4.10 on 2500HD;
Duramax 6600: 3.73 ratio standard on all models
So, most likely, you had 4.10:1 or 3:73 gears.
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Your truck also came stock with LT245/75R16E radial tires, which is equivalent to a 30.5" tall tire.
With a 35" tire (Significantly larger than a 30.5" tire) here are the recommended gear set changes from your original gears to the steeper ones:
3.73:1 ---> 4.28:1
4.10.1 ---> 4.88:1
Based on that information, here is a possibility of the issues you are facing:
While some people don't change their gears after going to larger tires due to $$$ and chock it up as "well, I'll just have to give it some more gas to get going". However, the fact is that not changing the gears can and will lead to more stress on the inner-workings of the axles. With the added stress of giving the truck more gas, this could lead to premature axle / differential failure.
However, this is ALL based upon the assumption that your issues are directly related to the differential section of your axle.
If you are having issues with the outter portion of your axle that would be a different story, since your truck has independant front suspension. If this is the case, boy I'd have to look hard at the lift kit. While it might have been installed correctly, something could in fact be out of alignment, tweaked or just plain wrong. That would be my knee-jerk reaction from what I know.
Rick
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/04/2004 7:25 AM |
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| by the way the truck only has 2000 miles on it
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STEVE760
Bone Stock
Posts:18
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| 12/04/2004 7:33 AM |
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| ive had the angles of the driveline checked, chevy dealers say working angle of driveline should be 4 degrees max
my driveline is 8 degrees. is the problem for 2 front diffs to go out in less than 2000 miles
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sublmnl1990
Body Lift
Posts:195
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| 12/04/2004 1:42 PM |
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| Is this happening on the street in 2wd or when you have it locked in 4wd I would also check and see if fabtech had any options with the lift. I know some put a spacer between the axle and the shaft at the diff, some come with new drive shafts. I would also make sure that all the parts were used, it may be installed correctly but something may have been left out, like mentioned above. Make sure the truck front diff is disengaged when driving on the street, the axle shafts should spin freely when in 2wd unless this is a new 4x4 system that I am not familar with and it engaged all the time. If you have extra clearance in the front I would have the torsion bars untweaked a bit this will lower the front and save on some of the shaft angles. Also drop a line to fabtech the can be very helpful if this is a known problem. Nick |
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You know it's going to be a good day when you get the milk to cereal ratio correct on the first bowl. |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/04/2004 7:23 PM |
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Steve - I guess I'm still unclear on what it is that's breaking down in your front axle. Is it the ring / pinion gear, is it the carrier, the bearings, the pinion shaft...
Knowing this might help pinpoint the problem.
rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/06/2004 7:50 AM |
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| rick i beleive its the pinion bearing but cannot be sure untill its taken out the first time it failed it was the pinion bearing |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/06/2004 10:21 AM |
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If it's the pinion bearing, then it is very likely related to the angle of the driveshaft.
You mentioned earlier that the driveline was 8 degrees. Where are you measuring? Is the carrier rotated 8 degrees forward, or is the front driveshaft sitting at 8 degrees? (I doubt it's the latter, but just to be sure).
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/06/2004 10:38 AM |
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| THE MESUREMENT WAS TAKING AT THE U JOINT
THE WAY CHEVY MESURES IT IS BY USING THERE TOOL WHICH SHOWS DEGREES
THE TURN THE JOINT DOWN, THEN TAKE A READING, THEN THEY ROTATE THE DRIVESHAFT SO THAT THE OTHER U JOINT Is POINTING DOWN, THEN THEY TAKE A READING AND ADD THE 2 TOGETHER
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/06/2004 3:09 PM |
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Sublmnl - does this sound like too much of an angle? For some reason, I always thought you wanted your DShaft at about 3-6 degrees tops... closer to 3 the better.
Thoughts?
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/06/2004 3:24 PM |
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| [img]c:\documents and settings\steve\my documents\my pictures\mvc-854.jpg[/img] |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/06/2004 3:33 PM |
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Here's a picture of the Drive Shaft angle that Steve760 sent to me:
[img]http://www.4x4review.com/discussions2/uploaded/webby4x4/2004126153158_d-angle-MVC-854E.jpg[/img]
RW |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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sublmnl1990
Body Lift
Posts:195
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| 12/06/2004 4:36 PM |
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| That appears over rotated to me it should be aimed toward the line of the drive shaft |
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You know it's going to be a good day when you get the milk to cereal ratio correct on the first bowl. |
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stagewest
Bone Stock
Posts:20
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| 12/06/2004 5:54 PM |
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| steve760 have you tried contacting fabtech 909-597-7800. Does the truck vibrate in 4 wheel drive? If the pinion bearing is going out it is probably from lack of oil from the rotation of the the ft. diff. you might have to overfill it so the pinion bearings get oiled. hope this helps |
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Joel Snider
Stage West 4-Wheel Drive Center
6700 Hwy 82 - Glenwood Springs, CO 81601 - PH: (970) 945-5227
http://www.stagewest4x4.com
4by4@crimsonwireless.com
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STEVE760
Bone Stock
Posts:18
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| 12/07/2004 11:21 AM |
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| the truck is going to be inspected by fab-tech on the 8 of dec,
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/08/2004 8:06 AM |
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awesome... let us know what you find out please.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/08/2004 11:38 AM |
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thank you all for all your help on this issue, and i will let u know how it turns out
steve |
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STEVE760
Bone Stock
Posts:18
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| 12/08/2004 1:25 PM |
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question?
the truck is at fabtech, does anyone think that they will say theres nothing wrong with that angle of the front diff? |
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STEVE760
Bone Stock
Posts:18
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| 12/08/2004 1:42 PM |
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just got word back from fabtech, they say nothings wrong with the installation of the lift kit,
they also said the angle look ok to them, whats my next move
please help
steve |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/08/2004 2:51 PM |
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Boy, there's nothing worse than "he said, she said" arguments.
At this point, I'll let the experts who do this for a living chime in as my opinion is just that... an opinion.
Sublmnl or StaeWest - what do you guys think?
RW |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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sublmnl1990
Body Lift
Posts:195
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| 12/08/2004 10:20 PM |
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| that angle just doesnt look right to me, I would try to find another truck with the same set up and compare it to his I just cant believe the axle should be pointing up as shown in the pic. |
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You know it's going to be a good day when you get the milk to cereal ratio correct on the first bowl. |
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STEVE760
Bone Stock
Posts:18
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| 12/09/2004 8:25 AM |
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fabtech says the lift meet there specs
they think theres not enough oil in the front diff.
they state that you have to raise the front end of the truck so that the diff is straight
and then fill it with oil.
does this sound right to anyone
steve |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/09/2004 8:38 AM |
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Yes, it does. I have to slightly overfill my rear diff due to the rotation and my Transfer Case as well.
Quote from StageWest
"...If the pinion bearing is going out it is probably from lack of oil from the rotation of the the ft. diff. you might have to overfill it so the pinion bearings get oiled. hope this helps..."
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/10/2004 11:52 AM |
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so if i get the third member fixed and get proper oil level in it,
do you think it will survive with the angle?
steve |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/10/2004 1:02 PM |
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This is MY humble opinion...
Yes, I think the 3rd member will survive the angle. I would be a bit suspect on the UJoint on the drive shaft though, BUT, since it's the front DSahft and doesn't get used that much, it might be ok. If you get concerned or do a lot of off-roading, you can replace it with a Tom Wood's GoldSeal UJoint.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/10/2004 1:42 PM |
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| thanks rick |
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STEVE760
Bone Stock
Posts:18
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| 12/10/2004 2:05 PM |
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i want to thank everyone for the input on my problem,
i think i have the info i need and this discussion can be taken of the boards now
steve |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 12/10/2004 3:38 PM |
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our pleasure. Drop us a note if you have more problems... hopefully not.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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STEVE760
Bone Stock
Posts:18
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| 12/10/2004 4:27 PM |
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i well and merry christmas to all
steve |
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