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My transmission is slipping can we fix it?

Tiny
KBOB2005
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I looked at the trans temp gauge it was about 210 an I put it in revers gave it gas the truck bogged down an let off the gas pressed it again an had full power fluid looks good and I have noticed some slippage
Sunday, June 29th, 2014 AT 5:26 PM

27 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
210 is fine. Have you pulled codes on the computer? You need a full code scan, not just a CEL scan. This guide can help us

https://www.2carpros.com/articles/automatic-transmission-problems

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.
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Sunday, June 29th, 2014 AT 6:06 PM
Tiny
KBOB2005
  • MEMBER
  • 2 POSTS
No codes are on only does it when trans is around that temp and only in reverse
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Sunday, June 29th, 2014 AT 6:32 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Ok. Check the parking brake. Make sure it's disengaging completely.

"an had full power" Does that mean in Reverse, or Drive?

There are 2 types of scans that can be done. Most shops and parts stores will only do a superficial scan that only pulls codes that set the Check Engine Light. All sorts of driveability codes that won't effect emissions won't set that light. You need a full, or deep scan to see if the Transmission Control Module noticed anything. Transmission codes won't set the CEL, but they can and will cause driveability issues.

Most likely there's a worn valve or O-ring in the transmission, probably the valve body, that is malfunctioning occasionally once the trans it at operating temp.
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Sunday, June 29th, 2014 AT 9:19 PM
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
  • 2005 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
2005 Chevy Silverado Z71 4X4 automatic 5.3 liter 75,000mi. Transmission slipping and vibration noise. I have changed all transmission, gear oil, and filters when this first started to happen and double checked all fluid levels this did not correct the problem.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
Has the check engine light come on? ALso, have you owned the vehicle since it was new? When you changed the trans fluid, was the old fluid dirty or have a burnt smell to it?
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
I purchased the truck used with 40,000 miles from a chevy dealer all fluids were checked when I did replace the fluid and trans filter they were in good condition. No smell
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
The service 4wheel drive light did come on approx at 73000 mi
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
That wouldn't have anything to do with the trans. If no warning lights came on and the trans is slipping, chances are the clutches are worn or there is a pressure problem in the transmission not fully engaging the clutch pack.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
A silly question would the output of the alternator if it is below 14.5 volts cause the transmission to slip based on the signal this provides to the electrical system that would cause a valve to operate incorrectly and if this was a cause would it send a diagnostic code error?
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
WESTERNEMS31
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 89,000 MILES
Hey my transmission is slipping and fluid smells burnt if I change filter and fluid will it fix the problem
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
No. When it gets to this point, it is time for an overhaul. The damage is already done. I recommend servicing the transmission every 50K. A complete flush is the best thing you can do. A normal filter and fluid change anly replaces about 6 qts of fluid. That means there is still about another 5 to 6 qts of dirty fluid in the transmission.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
As long as the power remains above 12.0 volts, it won't affect anything.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
Any idea on what the cost range would be to replace the clutches or is this a complete rebuild? And how long this normally would take?
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
Another question would be this is the original alternator how long do they normally last under normal wear conditions.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
Basically, the trans needs removed and a basic overhaul is completed. I would estimate around 1500.00 if no hard parts are needed. As far as the alt, it should last over 100K with no problem.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
Well to make a long story short I took the truck in and my problem is the troque converter is bad and needs to be replaced. Approx 600.00 much better than a rebuilt transmission cost. Thank you for all the input to all.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
MRBRB
  • MEMBER
  • 3 POSTS
  • 1998 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 265,000 MILES
Trucks will run and drive fine transmission does great and then it will act like 3rd gear is slipping to a point barely pulls. Can let truck sit for a spell and it will do great a job ain't but doesn't last.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
That will do it. It isn't building enough pressure to fully engage the clutch packs. I just hope the clutches haven't been damaged from slipping.

Let me know how things work out for you, and take care.

Joe
PS: That is a good price for the work.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is most likely a fluid issue causing clutch deterioration which causes the slipping. Or it is a cut seal that is causing pressure to drop when 3rd gear is engaged when the fluid is hot.

Basically I suspect you have a clutch issue. When the fluid and clutches heat up, the clutch starts slipping. The only way to fix this for sure is to disassemble the transmission and inspect it.

The fact that this happens when it gets hot and then when it cools down it starts acting normally points to the clutch issue. We can try something if you like too?

We can add a bottle of friction modifier to the transmission that will help soften the clutches so that they may stop chattering. This is only a temporary fix but will buy you some time and confirm it is a clutch issue.

These guides can help us

https://www.2carpros.com/articles/automatic-transmission-problems

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.

I added a picture of the Mopar modifier because I have used this many times on different transmissions and it has worked. I am sure you can use others but this is the one I have experience with.
Image (Click to make bigger)
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)
Tiny
BEARD_STEVE
  • MEMBER
  • 8 POSTS
Will do; it goes in the shop this Monday I will give an update after its fixed.
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Thursday, May 6th, 2021 AT 11:05 AM (Merged)

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