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98 4L60E

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friesr
New User

Jan 11, 2014, 10:22 AM

Post #1 of 4 (1905 views)
98 4L60E Sign In
Under lite acceleration at about 18 to 20 mph when the transmission is shifting into 3rd, it seems to shuffle between 3rd and 4th or possibly reverse as it has a metallic clunking sound with each shift cycle back and forth. It sound like back lash in the in the drive shaft. The engine also chokes down but does not buck vehicle. Then by about 22mph, it settles into 3rd and no problems shifting into 4th at hwy speeds. Under moderate or hard acceleration, it shifts through the gears normally. If you put the gear select in 3rd, it will shift normally as well. The transmission was rebuilt about 40k miles ago. It is not throwing any codes.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 11, 2014, 11:37 AM

Post #2 of 4 (1892 views)
Re: 98 4L60E Sign In
Make and model of vehicle? Any modifications done to the vehicle?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 11, 2014, 11:38 AM)


friesr
New User

Jan 11, 2014, 12:07 PM

Post #3 of 4 (1883 views)
Re: 98 4L60E Sign In
1998 Chevy Suburban K1500 4x4 5.7L Stock


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 11, 2014, 12:17 PM

Post #4 of 4 (1878 views)
Re: 98 4L60E Sign In
With something like you have you really need a scan tool with data stream capabilities that can monitor transmission information. It would be interesting to see how the PCM is controlling the shift solenoids, what vehicle speed information is, and to see if there is maybe a TPS glitch. Maybe watching those pids can get an idea where to look for the problem.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.





 
 
 






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