shifts into overdrive it seems like it slips

1997 FORD RANGER
150,000 MILES • 4.0L • 6 CYL • 2WD • AUTOMATIC
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WORTHIN52
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I have a 97 ford ranger 4.0l v6 automatic Trans with overdrive. About a week ago I put a bottle of Bars Leak Trans Stop Leak in the transmission. About two days ago I noticed when the transmission shifts into overdrive it seems like it slips. But I’m not sure that is the right terminology because if I accelerate fairly hard it shifts fine. It’s almost like if I don’t accelerate hard it is hanging up in gear. I wonder if the Bars Leak has clogged a valve or done something else. I would greatly appreciate any help you can offer me.
Thank You
Todd Miller
Nov 29, 2014 at 3:50 PM
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HMAC300
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Hello,

It sounds like you have a overdrive drum speed sensor that is going out here is the location so you can check it out. Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

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May 4, 2021 at 10:07 AM
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WORTHIN52
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I have a scan tool and I ran a diagnose on it and didn’t come up with anything no error codes. The Bars Leak that I put in the Trans wasn’t Tran’s fluid it was a think stop leak additive. I wasn’t having this problem before I put the stop leak in the Trans.
May 4, 2021 at 10:07 AM
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HMAC300
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only thing I can suggest is to try a fluid change maybe it will straighten it out. I never used most of those additives. Nor do many other mechanics.
May 4, 2021 at 10:07 AM
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WORTHIN52
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Do you know if it’s safe to drive at highway speeds 70mph with the overdrive turned off? Or will the transmission get to hot. I know it will affect my gas mileage.
May 4, 2021 at 10:07 AM
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HMAC300
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yes it's safe to drive at eway speeds your transmission will probably get worse as time goes by however. Not from the driving just from a failed part. but it's ok to drive.
May 4, 2021 at 10:07 AM
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WORTHIN52
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After thinking about this for awhile. I got a new drum sensor and installed. All good now thanks for your help.
May 4, 2021 at 10:07 AM