1996 GMC Other

Transmission problem
1996 Other GMC Models V8 Four Wheel Drive Automatic

I have a 4L60E getting a computer code 1870 I have rebuilt the transmission I have put and extra large boost valve in the pump to try and correct this code. When I took it on the highway driving 60mph the code returned after a few miles. I have had this problem in the past and it burns my clutches up. This issue was caused with a previous transmission so I bought a new one and ended up with the same problem. Is this a possible computer problem?
July 13, 2008.

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