4l60-e
99DenaliMan
11-20-2005, 10:47 PM
Ok here's the deal.
99 GMC Denali.
4l60-E Transmission
Electronically controlled 4 wheel drive
168,XXX miles.
History of problems : Vehicle has always had a slight shudder at complete stop and take off. According to tsbs - lubed slip yoke, then tried to replace slip yoke with Nickel played slip yoke when lube was only temporary.
This is probably irrevelent and not affilated with my current problem, but worth mentioning.
Recent problems: The transmission/Transfer case/Driveshaft would sound/feel like it was "binding" slghtly when taking right turns for the last few miles... odd, eh.
I got the truck home, not thinking much of the problem, except maybe a suspension problem.
Pulled it out of the garage today, and less than 100 feet from home you could hear and feel a "clunk", it would be really loud. The transmission would engage then "clunk", then slippage, Then a really loud and vibrating "clunk" then engagement. back and forth. It'll do this in all gears including reverse, and is so frequent it'll do this 5-6 times within 15 feet. It's not a smooth movement at all.
Being that I have taken a 4L60-e and 4T60-E (Transaxle version) both apart and back together, the only thing I can think of is that the bands on the planetary gear set are engaging and disengaging spuratically. Then I think, that wouldn't make since since it is such a harsh and very loud engagement, disengagement.
SO I thought I would try manual 1.---Same problem. In D- R and Man 1
Auto 4 wheel, 4 hi, and 4 low and 2 wheel drive all seem to work fine. I did notice a rather harsh transition when pushing the buttons. (you could feel a "movement" of what sounds like the driveshaft slightly binding.-Could be normal, but seemed a little harsher than usual" Also double checked the operating to make sure I had all symptoms. The TCC seems fine. When I'm at a dead stop and put it in "r" and push the gas with foot on the brake the truck seems to raise, and there is no problem. When backing up its' more like clunk clunk clunk clunk clunk, then the real loud and harsh "clunk" then disengagement. Maybe it's a transfer case issue?
This is my Winter and "reliable" vehicle, so any response is appreciated.
99 GMC Denali.
4l60-E Transmission
Electronically controlled 4 wheel drive
168,XXX miles.
History of problems : Vehicle has always had a slight shudder at complete stop and take off. According to tsbs - lubed slip yoke, then tried to replace slip yoke with Nickel played slip yoke when lube was only temporary.
This is probably irrevelent and not affilated with my current problem, but worth mentioning.
Recent problems: The transmission/Transfer case/Driveshaft would sound/feel like it was "binding" slghtly when taking right turns for the last few miles... odd, eh.
I got the truck home, not thinking much of the problem, except maybe a suspension problem.
Pulled it out of the garage today, and less than 100 feet from home you could hear and feel a "clunk", it would be really loud. The transmission would engage then "clunk", then slippage, Then a really loud and vibrating "clunk" then engagement. back and forth. It'll do this in all gears including reverse, and is so frequent it'll do this 5-6 times within 15 feet. It's not a smooth movement at all.
Being that I have taken a 4L60-e and 4T60-E (Transaxle version) both apart and back together, the only thing I can think of is that the bands on the planetary gear set are engaging and disengaging spuratically. Then I think, that wouldn't make since since it is such a harsh and very loud engagement, disengagement.
SO I thought I would try manual 1.---Same problem. In D- R and Man 1
Auto 4 wheel, 4 hi, and 4 low and 2 wheel drive all seem to work fine. I did notice a rather harsh transition when pushing the buttons. (you could feel a "movement" of what sounds like the driveshaft slightly binding.-Could be normal, but seemed a little harsher than usual" Also double checked the operating to make sure I had all symptoms. The TCC seems fine. When I'm at a dead stop and put it in "r" and push the gas with foot on the brake the truck seems to raise, and there is no problem. When backing up its' more like clunk clunk clunk clunk clunk, then the real loud and harsh "clunk" then disengagement. Maybe it's a transfer case issue?
This is my Winter and "reliable" vehicle, so any response is appreciated.
maxwedge
11-21-2005, 09:40 AM
If you have the G80 locking differential in the rear diff of course, this may be the source of the problem, they are a somewhat troublesome rear to begin with. You could try changing the fluid and flushing it out, may work, use the recommended synthetic. BTW, the info given and your description of the condition should be a model for all posters on these forums!!
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