I have a problem that has completly stumped me. I'm trying to figure what the cause could be. I have a 1994 Full size blazer with a 4l60e tranny that would not go into Third\Overdrive. It acts as if you have shifted to neutral.
I have ordered and Installed a Master Rebuild Kit, new torque Convertor, new piston\accumulators, a new reman Valve body with all electronics.
Still does same problem. Wierd part, IF you put the rear axle up on jack stands I can run the speed up to 65 and it seems like it is shifting fine. It tachs at around 2000 rpms. I can rev it up and down and it seems normal.
Drop it back down and I can't go over 45 mph and taching at 5000 rpm. Shifts into nuetral again. If I punch it it will downshift into second again but drops back into nuetral when it gets up to speed.
I have had the thing off and on the stands twice to verify this behaviour.
I'm trying to fix this for my son but have spent countless hours trying to pinpoint problem.
Any pointers or direction to check in I would appreciate. What would cause the shifting to be different depending on if the wheels are touching the ground or not? I know when they are on the ground there is more torque on the tranny but what would control the tranny so much that it would completly throw it off so it would not shift, some sensor bad, computer??
Thanks
Ray
I have ordered and Installed a Master Rebuild Kit, new torque Convertor, new piston\accumulators, a new reman Valve body with all electronics.
Still does same problem. Wierd part, IF you put the rear axle up on jack stands I can run the speed up to 65 and it seems like it is shifting fine. It tachs at around 2000 rpms. I can rev it up and down and it seems normal.
Drop it back down and I can't go over 45 mph and taching at 5000 rpm. Shifts into nuetral again. If I punch it it will downshift into second again but drops back into nuetral when it gets up to speed.
I have had the thing off and on the stands twice to verify this behaviour.
I'm trying to fix this for my son but have spent countless hours trying to pinpoint problem.
Any pointers or direction to check in I would appreciate. What would cause the shifting to be different depending on if the wheels are touching the ground or not? I know when they are on the ground there is more torque on the tranny but what would control the tranny so much that it would completly throw it off so it would not shift, some sensor bad, computer??
Thanks
Ray