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Overdrive rpm at 80 mph?


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#1 88351wtsi

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Posted 19 April 2015 - 02:47 PM

It seems like my tranny isn't going into o.d. As long as I am cruising until I let off throttle. What rpm should the engine be turning at 80 mph?  Mine is at 4000 which seems high to me. Act like it is still in 3rd but can see a small change when I turn od off on shifter.
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        Sophia white MS2 full sequential with BW S257sxe in the middle of a full tear down

Hers: Red restored and on the road, mostly stock





#2 chassispuke

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Posted 19 April 2015 - 03:03 PM

in my auto tranny 88 starion 80mph rpms are still right under 3k. u definetly have no overdrive.

#3 88351wtsi

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Posted 19 April 2015 - 04:37 PM

That's what I was afraid of.  I feel it kick in sometimes and rpms drop but then goes back up. Could it be a sensor or something simple?
1988 Conquests  

His:  Durban maroon with 351w  
        Sophia white MS2 full sequential with BW S257sxe in the middle of a full tear down

Hers: Red restored and on the road, mostly stock

#4 88351wtsi

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Posted 19 April 2015 - 04:43 PM

I may have found another post but would it be the temp sensor if it works when cold and not when normal temp or is it that it could be slipping so bad it has to go to 3rd?
1988 Conquests  

His:  Durban maroon with 351w  
        Sophia white MS2 full sequential with BW S257sxe in the middle of a full tear down

Hers: Red restored and on the road, mostly stock

#5 scott87star

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Posted 19 April 2015 - 05:06 PM

It isn't difficult to reset the OD band, just jack up the car so you can get under and it's the cover plate with three bolts on it towards the front of the tranny.  Follow the FSM method and see if that fixes it.
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#6 88351wtsi

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Posted 20 April 2015 - 08:59 PM

Thanks Scott.  Just hoping it will.
1988 Conquests  

His:  Durban maroon with 351w  
        Sophia white MS2 full sequential with BW S257sxe in the middle of a full tear down

Hers: Red restored and on the road, mostly stock

#7 Bad2Rass

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Posted 05 July 2017 - 12:47 PM

Old thread, but just figured I would ad my .2 cents. At PF this passed weekend Larry helped me figure mine out there is a coolant sensor that switches to ground once the car has warmed up, check it. It is the 2 wire sensor when you apply ground to the lead for OD you can here the relay click on the trans, likely in the valve body.
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