Transmission down shift

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09-24-2010 | 05:24 PM

ItBeMe

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From: On planet earth & in Hotlanta Ga.

Transmission down shift

I have a 1997 GMC Sierra 4l60E 5.7 1500 The transmission works fine, but when put the gas to the floor to down shift it only revs up. It does not shift down. Anybody know what could be wrong.

09-25-2010 | 01:00 AM

RUFFNECK4LYFE

Toyota, Nissan, and Other Truck Forum Moderator

Joined: May 2009

Posts: 1,845

From: West Texas

Test your TPS(Throttle Position Sensor). These wear out and can cause shifting problems.

09-25-2010 | 05:16 AM

ItBeMe

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Senior Member

Joined: Jul 2010

Posts: 161

From: On planet earth & in Hotlanta Ga.

Thanks for the reply. Now can you tell me where it is at, And how do I test it.

09-25-2010 | 09:41 AM

RUFFNECK4LYFE

Toyota, Nissan, and Other Truck Forum Moderator

Joined: May 2009

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From: West Texas

09-25-2010 | 03:59 PM

ItBeMe

Thread Starter

Senior Member

Joined: Jul 2010

Posts: 161

From: On planet earth & in Hotlanta Ga.

Thank You I will check it out. I was doing a search in here and seen that a check engine lite and the O2 censer could cause the same thing. And I had that. So I will drive it and see. Thanks again.