Hard Shifting after highway driving (1997 Chevrolet Tahoe)?

I have similar problem with transmission or whatever thing called on 1997 Tahoe. It only occur during summer, if driving more than 15 or 20 miles like Grant say.

I took it to shop, even ACME Tranmission shop, they found gear teeth were chipped off but could not find what causes it, Seem like GM issue with transmission that no others would know.

So I swapped problematic Transmission from totaled Silverado and problem solved.

Had the same problem with my '97 Sierra, has the 4l60e transmission- I
did the same thing, had the transmission worked on, it helped but did
not solve problem. I also noticed that the truck just didn't seem to
have the power it had when it was new, I just figured it has 85,000
miles and is getting a little worn.
Let me guess - when vehicle is cold, you don't have a problem.
After it warms up really good, if you have a tachometer, you can
notice that it will shift all the way into fourth gear, but the torque
converter won't lock up. After driving it this way for a few miles,
transmission will detect this slippage and go into hi line pressure
mode, to let you get home. When you kill the engine, it resets
the computer until it does it again.
Your problem is in your engine. Long before you notice that it's in
need of service, the performance affects the transmission, which
doesn't work right unless the engine is perfect.
In my particular case (yours may have a different problem) I tuned
up the truck, changed plug wires, etc., nothing helped.
Finally, truck got to where it would bog down over 40 miles per hour.
Did a pressure test on catalytic converter, it was almost completely
clogged up.
I had converter changed, ( it was melted into slag inside) also
changed all the oxygen sensors, because if they are bad, they will
cause the catalytic converter to overheat and melt.
After this was done, truck ran as good as it did when it was brand
new, and transmission troubles are gone.
I don't know if you have the same problem, but any muffler shop should

be able to check the exhaust pressure before and after the converter
for a reasonable price. If that is your problem, don't cheap out and
skip the oxygen sensors, or you will have the same problem again.
Good luck

I was surprised to know that I am not only person with same vehiciles or similar parts that have problems.

"catalytic converter" with bad oxygen sensor is the blame.... I have a friends who works for GM spefficically Chevrolet/GMC stating that GM is having issues with SUV Transmissions.. and suprisely never proposed for recall on converters/oxygen sensors..

From my understanding, if A oxygen senors in converter is damaged, The ECU (vehicle brain) sends incorrect information on engine performace such as for Amount of fuel mixure, Spark timming, water flow, air flow, auto transmission gear shift and etc. If they don't flow it correct, it ll cause strange performace on engine perhaps appear more problems on other parts around engines.

Well, what can I say... thats other thing from GM Greddies???

I have the same problem on 97 chev suburban. hard shifting from 1 to 2 after highway miles. I took it to Chevy dealer and they said it was the shift solenoid in the tranny. It first happened at 120K miles. the tranny repair from chevy was the same cost as a repop replacement tranny from a local tranny shop, so I opted to just drive it until it failed, knowing the tranny would have to be replaced anyway. I have put 50K miles in 3years on it since the problem first occured. It only happens once a month or so, and I am just dealing with it.

Had the same problem with my '97 Sierra, has the 4l60e transmission- I
did the same thing, had the transmission worked on, it helped but did
not solve problem. I also noticed that the truck just didn't seem to
have the power it had when it was new, I just figured it has 85,000
miles and is getting a little worn.
Let me guess - when vehicle is cold, you don't have a problem.
After it warms up really good, if you have a tachometer, you can
notice that it will shift all the way into fourth gear, but the torque
converter won't lock up. After driving it this way for a few miles,
transmission will detect this slippage and go into hi line pressure
mode, to let you get home. When you kill the engine, it resets
the computer until it does it again.
Your problem is in your engine. Long before you notice that it's in
need of service, the performance affects the transmission, which
doesn't work right unless the engine is perfect.
In my particular case (yours may have a different problem) I tuned
up the truck, changed plug wires, etc., nothing helped.
Finally, truck got to where it would bog down over 40 miles per hour.
Did a pressure test on catalytic converter, it was almost completely
clogged up.
I had converter changed, ( it was melted into slag inside) also
changed all the oxygen sensors, because if they are bad, they will
cause the catalytic converter to overheat and melt.
After this was done, truck ran as good as it did when it was brand
new, and transmission troubles are gone.
I don't know if you have the same problem, but any muffler shop should

be able to check the exhaust pressure before and after the converter
for a reasonable price. If that is your problem, don't cheap out and
skip the oxygen sensors, or you will have the same problem again.
Good luck

My 2005 Chevy Tahoe hatchback won't open manually of with the keyless entry. Does anyone know what the problem could be?