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Getting Slip in Drivetrain Somewhere?!? Video!

Another update. Because I was "so bored" :whistle: yesterday, I decided to pull the entire rear axle 14SF and driveshaft out and swap back in the old 10 bolt and old driveshaft.

Conclusion, the slippage is still occurring. So, in one respect I'm relieved that it wasn't the new differential or gears. Unfortunately, it can either be the tranny or t-case. Or some mounts somewhere.

Reinstalling the old ubolts, axle, driveshaft, etc at least helps eliminate those components. Now the fun.....putting the 14sf back in. :haha:
 
Deuling said:
Lol talk about troubleshooting :haha:
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Ummm.....yea.:thumb:

However, it's free other than my labor. So as much as I didn't want to do it, I just can't justify paying someone to troubleshoot on my dime. At least I don't have to go to the differential shop. All his work is good.:waytogo:
 
Update:

I did take it to the Tranny shop again to let them look over the whole truck. They cautiously tried to eliminate things before pulling the tranny out again. They drained and checked the rear end.....nothing. Checked the t-case for anything abnormal....nothing.

At that point, they really felt like it was in the tranny.

After a few more tests, they decided to pull it out and look at it on the bench. This time though, they brough in another "old school" guy to have him go through everything. The first layer was OK and nothing unusual....however, yesteday they found a problem. There are two bushings or rings (don't remember) but they were suppose to be the same size. Apparently one is smaller than the other and creating some problems. This, they believe, was making the line pressure fluctuate and not being consistent. They also found a few other minor things and will be sure everything is good later today.

Hope to have it back in truck by noon for testing and be sure everything was done correctly.

Unfortunately, this was also part of the Cheyenne rebuild issue that my local shop inherited. The Cheyenne shop was just in too much of a hurry I guess, or just not capable of rebuilding it precisely.

Anyways, good news and I hope this fixes it! :waytogo:
 
Keep us updated on if this fixes the problem. I was reading through the string of posts and was going to suggest the slipyoke of the driveshaft was binding on the t-case output splines. This was a fairly common problem for Chevy in the mid to late-90s and I believe they even issued technical service bulletins on the condition. My bro-in-law had a late'90's Tahoe he bought new and starting around 50k miles it started doing a clunk/slip type feel taking off from every stop. It was the splines binding and then suddenly letting go. Whenever you apply power the rear axle, springs, etc... all "torque" over some and requires the driveshaft extend or retract a small mount, meaning it had to slide on the splines. In your video showing the driveshaft at the t-case you can see it moving in and out (look at the outer lip of the seal flexing in and out). I think the dealer was just lubing the splines up and it would fix the problem for a short period of time, then it would come back.
 
I got the truck back and I must say, WAY better! They found a few parts inside that were either wrong or missed. The other contributing factor was the t-case brace. It was broken at the bell housing. I ran to he junkyard and picked up another one for $8. They slapped it on and now it is so much tighter. Smooth shifts and no more slop between gear changes.

So glad its finally fixed! It just kept bugging me that it wasn't quite right.
 
Good to hear. It always bugs me when you know something ain't quite right. Hopefully they didn't charge for their mistake. Hopefully the tranny will have a long full life now that its in and correct.
 
Well, I was probably a little over optomistic with the previous fixes from the Tranny shop....the problem is still there.

However, during my long process of removing lift and putting the t-case back into stock location, I did not notice the problem anymore.

I did eventually have to put the 2.5" lift back on (with t-case drop) and it re-appeared. So, I think this problem is definitely related to the t-case being dropped. My long term plan is a CV driveshaft and putting the t-case back into stock location.

Just wanted to close the loop on this issue. And thanks all for the help!
 
6.2Blazer said:
Keep us updated on if this fixes the problem. I was reading through the string of posts and was going to suggest the slipyoke of the driveshaft was binding on the t-case output splines. This was a fairly common problem for Chevy in the mid to late-90s and I believe they even issued technical service bulletins on the condition. My bro-in-law had a late'90's Tahoe he bought new and starting around 50k miles it started doing a clunk/slip type feel taking off from every stop. It was the splines binding and then suddenly letting go. Whenever you apply power the rear axle, springs, etc... all "torque" over some and requires the driveshaft extend or retract a small mount, meaning it had to slide on the splines. In your video showing the driveshaft at the t-case you can see it moving in and out (look at the outer lip of the seal flexing in and out). I think the dealer was just lubing the splines up and it would fix the problem for a short period of time, then it would come back.
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Yeah, I used to have this problem before going to a C/V driveshaft. It was the worst after hard braking, where the back of the truck raised up. The torque in the shaft (from the brakes) would make the splines bind up, holding the back of the truck up a little more than static height would be otherwise. When taking off again - clunk - then everything was fine. U-joints were like 12 or 13 degrees at static height.
 
What I have done on my stuff (very close to stock height) is to grease the splines in the driveshaft yoke. Seems like I have to do it once a year, but it gets rid of that clunk feeling on take off.
 
black dawg said:
What I have done on my stuff (very close to stock height) is to grease the splines in the driveshaft yoke. Seems like I have to do it once a year, but it gets rid of that clunk feeling on take off.
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I did pull the shaft out and lube the splines.....didn't do much unfortunately. :dunno:
 
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