Question about 1996 GMC Sierra

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96 Sierra Z-71, Vin#-2GTEK19R6T1560475, 4wheel, stepside

Lost Drive, and 3 gears on automatic transmission
Lost Anti-braking system non functional --- Trouble light on dash
Speedometer dead - tack still works Odometer dead
All this died at the same time during a road trip
No visible vacume line problems
No visible electrical connection problems
I dissconnected the positive terminal on the battery overnight to reset the electronics.
Do i need a new transmission, or what?

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I am no expert here but it sounds like a computer problem, that much all at once. chk. all plugs that go into computer maybe ones loose or sliped out. Chk. all ground wires from body to engine, and chassey. some of the grounds you may have to go under truck to chk. It only takes one to screw things up.

Posted on Feb 06, 2009

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This may apply. ...............................

Carry out the adaptation drive cycle road test:

Note: This process must be carried out in normal mode (not sports mode). On a flat road, the transmission fluid temperature must be above 60° C (140° f) and below 100° C (212° f) (vehicle at normal operating temperature will ensure that the transmission fluid temperature is above 60° C (140° f)).
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Page 2 of 3 Bulletin Number S307-17
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