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Still at last the Code is not removed...

8 time Repaired the Transmission...

4 Egineers came but all are faliaure.

At last I changed the transmission .. as the transmission 4L80E
the model...

Thankx for nice coaprative... I'm checking these now

I think May Be I got the point...
Let me check

No Sir code68 appearing...
Transmission Shifting is fine and OK.. But when you became 4rth Gear and you press full accelator it takes Kick down and coming in 3rd... Then it never change of 4rth.....

Yes...

I 'm using OBD-I ECM..

I think Code
68 means

Cruise control - system
circuit problems.
OR

Thanks Sir...

But still same problem..

it appear code no 68

I have to face one problem from 7/8 days...
in Transmisasion 4L80E We overhaul it...
now the problem in 4rth Grear

I have this Transmission in GMC Truck 454 Engin Model 1990.

Shifting is OK.....