'97 K1500 Chevy Z71: Tranny bumps in 45-55 MPH Range

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  #1  
Old 04-17-03, 10:11 AM
weapon
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Question '97 K1500 Chevy Z71: Tranny bumps in 45-55 MPH Range

I have a '97 Chevy K1500, Z71 Pickup w/ 4L60E Transmission, that I experience a momentary harsh bump/tug when I get into the speed range of 45-55 MPH. This seemed to have just start right after I had the truck in to a service shop to repair a coolant leak from an intake gasket failure. Right after this repair was done (replaced the complete intake gasket & added antifreeze) was the start of this problem. I took it back to the service center that worked on the truck. They ran a scan on the engine and the transmission and came up with nothing wrong. They inspected all the connections and other work they had done and found everything correct. They felt that something was wrong with the transmission.
Next I took the truck to a Chevy Dealership. They had the truck for 2 weeks. They done a complete scan of both the engine and transmission. No codes stored. they decided all that was needed was a complete tune up. They replaced: Spark plugs & wires; Rotor & cap; PCV Valve; Fuel Filter; Engine oil & filter; Raditor cap; Adjusted the timing; and checked the various wiring and connectors. But still it did not correct the problem. they next contacted GM. The advised changing the TCC Sol. SW, flush the transmission system, and change the filter. They did that plus checked the internal wiring harness, but still no change in the problem. Finally they said it probably was due to a lockup in the transmission.
Next I took the truck to a Transmission Specialist Shop. After hearing what everyone else had done or looked at they felt that the problem was in the tork convertor . They changed it, but the problem still presist with no change. Now they tell me I need a complete rebuilding of this transmission or put another in its place
I need help!!! Any advice out there?
My thoughts all along is that it is something simple like an off the mark electrical signal. But what?. Even though the truck has 95K miles on it. It has to this point run great. No problems It has never be neglected as far as service to it. The chevy dealer told me that the old transmission oil was relative clean for its age as was the old tranny filter.
Joe
 
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  #2  
Old 04-17-03, 10:28 AM
Joe_F
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You do not give us the engine size, so I guessed it's a 350.

There have been numerous bulletins on this tranny and truck:

http://alldata.com/TSB/11/971136GQ.html

Suggest you print them out, go back to the Chevrolet dealer and show them to them. Ask them if any of them would be the cause of the problem and how they would correct it based on that bulletin. Some might be covered by partial reimbursement perhaps, depending on the problem.

Not many dealers check the TSB's first, although they should!
 
  #3  
Old 04-19-03, 06:32 PM
weapon
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To Joe_F

Joe_F: Thanks for the reply. As you suggested I down loaded a copy of all the TSB titles to go back to the Chevy Dealer with. Item #230, TSB #77-71-53 (A/T - Chuggle/surge on TCC apply/No DTC's) looks like a good starting place.
 
  #4  
Old 04-19-03, 08:42 PM
Joe_F
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Good. Have the dealer check it out and let us know the results and what fixed it.
 
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