well then pull the abs fuse pretty sure that will disable it, the brakes won't be held because the abs pump can't operate.
Feels like something slips, but only at part throttle
- Thread starter gooffeyguy
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swathdiver
Full Access Member
Tom, did you check your line pressures and such with the Tech-2?
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gooffeyguy
Tom
Not yet. Should I check them while driving and trying to replicate the condition (datalog) or just in general while idling?
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swathdiver
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Driving, have someone drive while you watch the screen or do a snapshot and play it back later.
04BUCKET
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SIMILAR ISSUE IN MY 08 PPV TAHOE.
WHEN STOPPED, EVERY NOW AND THEN IT FEELS LIKE A SUDDEN JERK IN THE REAR END. AT TIMES IT DOES IT AS I LET OFF THE BRAKE PEDAL. SOUNDS LIKE DRIVESHAFT TURNED A BIT AND NOISE COMES FROM U-JOINTS, EXCEPT THOSE WERE FIRST THINGS I REPLACED ASSUMING THAT WAS ISSUE.
WHEN STOPPED, EVERY NOW AND THEN IT FEELS LIKE A SUDDEN JERK IN THE REAR END. AT TIMES IT DOES IT AS I LET OFF THE BRAKE PEDAL. SOUNDS LIKE DRIVESHAFT TURNED A BIT AND NOISE COMES FROM U-JOINTS, EXCEPT THOSE WERE FIRST THINGS I REPLACED ASSUMING THAT WAS ISSUE.
Not sure with your transmission but in my DD a GM but not a truck. My understanding is by shifting in to 1st at a stop a different part of the valve body is used. This stops the slip for me. Mine is in need of a pressure solenoid. Hopefully someone that knows these transmission can way in if this is the case with these.
This sounds like the drive shaft slip yoke sticking. There's a "special lubricant" for it and it fixes some but we ended up replacing the yoke with the nickel plated one on my uncle's 08 Silverado because the lube would only fix it for 6 months.
sonic_the_hedgeh
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I have an 04 yukon denali and I cannot shift properly WOT. But if I let off the throttle it will shift fine. I was suggested to buy a transgo kit to fix this problem.
I went to a shop today and a tech did a test drive and said it is shifting from 1st to 3rd you don't have a second gear.
Yet he cannot confirm what is preventing the shift without rebuilding it. I have doubts as others with shifting problems have used the transgo kits and they worked.
Any ideas?
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gooffeyguy
Tom
I think I found my problem. I did the motor mount test today and I feel this same thud when the engine raises a couple inches on the drivers side.
So, guess new mounts are in the near future
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So, guess new mounts are in the near future
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Well I guess it’s good that you found the problem but it kind of sucks that’s it’s not an easier fix. Are you going with the Hummer mount?
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gooffeyguy
Tom
Yeah, I ordered the H3 mount from RA.
I'm rather relieved that it's a bad mount and not something else like a loose transfer case chain or something more complicated or expensive.
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Yeah i guess it could have been way worse.
ivin74
05 NBS Nali
Did the motor mount fix your issue?
RuggedGMT400800
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It's the rear Pinon that causes this. Front diff nothing to do with it and trans case won't wind up like that otherwise it'd be loud grind or shriek... dealership replacing or pretending to replace unnecessary major components for a gullible, trusting, or foolish client. They replaced the 22$ 10 minute seal then charged many thousands for nonsense.. maybe just wiped the front diff and trans case down with a rage and put a few grand in pocket.
Were you there? Unless you were there and have proof of that happening, you have no clue what you’re talking about.
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gooffeyguy
Tom
Yes
Easy there big shooter! Might want to hold off on throwing out comments like this here. No dealer involved to take advantage of a foolish client. I do my own diagnosing and repairs and do not just throw parts at problems. Got that 2007 to 300K that way. I know for a fact this solved my problem. If you were able to fix your issue with a $22 seal, that’s great.
RuggedGMT400800
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Neithe
What happens is when using go to accelerate you'll get a slip followed by a tailbump caused by the rear driveshaft starting to spin prior to engaging the ring gear due to aforementioned worn/damaged Pinon seal/crushsleeve and the play it creates. As it rotates and inertia drives it rearward back to where it normally belongs in proper permanent engagement..
Makes perfect sense to me.. I've replaced several dozen Pinon assemblies on gmt400 and gmt800 as well as have rebuilt many transfer cases as well. And have had my fair share of hundreds of hours with front diffs on the bench and in hand.. so no sir, needing to be there to watch someone who may have known better st the time or was in a vulnerable situation and in need of immediate repair without regard to sensible reasoning of the symptoms vs the proposed repair, fork over money unfairly suckered from him is not necessary for diagnosis. No disrespect intended.. Was more upset knowing thrbdealer took you for a couple grand than anything else, I didn't mean to come off with a bad demeanor and my appologies for doing so as I realize I was a little bothered when I wrote that, my mistake
Neither the transfer case nor the front diff causes the symptoms described.. however, the symptoms described is exactly spot on consistent with what a failed crush sleeve (reduces or eliminates pinon preload) and/or a backed off pinon nut/ improperly torqued Pinon nut.
What happens is when using go to accelerate you'll get a slip followed by a tailbump caused by the rear driveshaft starting to spin prior to engaging the ring gear due to aforementioned worn/damaged Pinon seal/crushsleeve and the play it creates. As it rotates and inertia drives it rearward back to where it normally belongs in proper permanent engagement..
Makes perfect sense to me.. I've replaced several dozen Pinon assemblies on gmt400 and gmt800 as well as have rebuilt many transfer cases as well. And have had my fair share of hundreds of hours with front diffs on the bench and in hand.. so no sir, needing to be there to watch someone who may have known better st the time or was in a vulnerable situation and in need of immediate repair without regard to sensible reasoning of the symptoms vs the proposed repair, fork over money unfairly suckered from him is not necessary for diagnosis. No disrespect intended.. Was more upset knowing thrbdealer took you for a couple grand than anything else, I didn't mean to come off with a bad demeanor and my appologies for doing so as I realize I was a little bothered when I wrote that, my mistake
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