I have a 99 silverado 4x4. I just put in a tranny with 35k on it. When I drive it shifts in and out of overdrive. any ideas
Mar 17, 2010 at 10:34 PM
1999 Chevy Silverado overdrive shift
1999 CHEVROLET SILVERADO
SKINSFAN69
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BLUELIGHTNIN6
- ✓ASE Certified Mechanic
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Hello and thanks for donating
You sure it's shifting gears? And not just locking and unlocking the torque converter clutch?
Try it with OD shut off and at a low speed i.e. 35 to 40 MPH. May need to adjust the TPS
You sure it's shifting gears? And not just locking and unlocking the torque converter clutch?
Try it with OD shut off and at a low speed i.e. 35 to 40 MPH. May need to adjust the TPS
Mar 19, 2010 at 12:19 PM
I drove it at 65 took it out of o/d rpm went up then i went back into o/d rpm went down it was smooth. There are no tranny codes just a bank 1 air injection code maybe thats why at a sustained speed of 45 there is a hesistation no check engine light on
Mar 19, 2010 at 8:38 PM
BLUELIGHTNIN6
- ✓ASE Certified Mechanic
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what speed is it hunting overdrive at then? other than the OD issue, does it shift fine?
Mar 22, 2010 at 1:01 PM
It shifts fine even o/d I think I have a EGR valve that is hanging up or something related to the air injection.
Mar 22, 2010 at 10:00 PM
BLUELIGHTNIN6
- ✓ASE Certified Mechanic
- 16,542 POSTS
could try removing the EGR valve and cleaning it along with the valve's passageway. a faulty EGR valve can effect shifting and if you have the MIL on with the code it's def. worth a shot and free to do.
Mar 22, 2010 at 10:10 PM
No check engine light on just a guess
Mar 22, 2010 at 10:14 PM
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