Engine/Transmission (1994 - 1998) Trans shifting down

[Philsram]

I have a 95 3/4 ton 2wd cummings. The truck has been great except for the transmission shifting down as of late. At 65mph the trans will kick down and I notice that the rpm's jump from 1,800 to 2,000. This is without a load. I also notice that the od light is not on . Do I have a transmission getting ready to take a dive on me? This is one of those famous auto trans. Help me if you can? Thanks

 

[shendren]

never heard of a cummings?



you probably need to

clean your tps

put in a new tps

or

pull the tps wires out of the loom (electrical noise)

 

[JFinke]

Our 94 auto started shifting up and down at 222,000. It was the trans temp sensor. Is your trans temp light coming on? It also acted up at about 270,000, but the speedo would jump from 50-80 as it locked and unlocked the convertor. I cleaned the VSS termials and coated them with di-electric grease and stopped that problem. It helps to have a scanner to hook up and watch the data stream to see exactly what the computer sees. Jake

 

[DavidGardner]

What Shrenden said. Probably the TPS, had the same problem and did what he said and the problem went away.





Good luck on your fix.



Dave Gardner

 

[Philsram]

transmission downshifting

I want to say thanks for the reply's. Is there any special cleaner I should use to clean the tps and why is the wiring harness a problem now? Thanks for the help

 

[Dkevdog]

Originally posted by shendren

never heard of a cummings?

Yes you have! That's the one that Ford Owns!



Check that TPS.



Kev

 

[illflem]

CRS Electronic Cleaner works for me, available at most auto and hardware stores.