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#1 |
Registered User
Join Date: Apr 2010
Location: Boise, ID
Posts: 1,280
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Very Strange Change
I have been watching my tach very carefully and also using a gps speedometer and yesterday I experienced a definite change.
2100 RPM's was 65. Yesterday and today 2500 is now 65 and my OD is still working. Nothing was changed. It is so strange to me but like I learned with my temp issues, start with the gauge accuracy but it isn't bouncing our anything so I just don't know. I hooked up the OD on my 700R4 a few weeks ago and felt the change, it is definitely still working. Someone once told me how to identify my rear end gear ratio so I am going to do that. I still cannot figure this out, truck still runs good though. Anybody ever experience the same thing? Last edited by ubtripn; 08-03-2016 at 11:01 AM. |
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#2 |
Registered User
Join Date: Mar 2016
Location: Long Island NY
Posts: 598
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Re: Very Strange Change
Do you have a lockup torque converter? A lockup converter will usually drop about 300-400 engine rpm when it locks up since it's not slipping like a normal converter. If you do have a lockup converter I'd start there as it sure sounds like the issue. Sorry but I have no idea about diagnosing the issue. All I know is the converter usually locks up in overdrive at highway speeds.
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#3 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
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Re: Very Strange Change
Recheck the adjustment on the TV cable and the wire going to the trans. Make sure the wire still has power with the key on
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#4 |
Registered User
Join Date: Apr 2010
Location: Boise, ID
Posts: 1,280
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Re: Very Strange Change
I checked that since I just got the OD working a couple of weeks ago, that was my first thought as well but it is definitely engaging.
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#5 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Very Strange Change
Lockup is usually 150-200 rpm change. Sounds like it's not going into fourth.
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#6 |
Registered User
Join Date: Apr 2010
Location: Boise, ID
Posts: 1,280
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Re: Very Strange Change
I am going to go out and do two more runs to count them out. Thank you all.
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#7 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
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Re: Very Strange Change
If everything is working correctly, driving down the road if you lightly step on the brakes you should feel the torque converter dis-engage and lock back up when you release the brake pedal.
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