This is Fuelmans son my 97 is not shifting correctly it was hanging up in first then sometimes it would shift about 2500rpms other wise i would have to shift it into second on the dash, but now first gear isnt even working it is just starting off in second gear, let me know if any of you guys might know whats wrong thanks.

 

Range Position Sensor on the driver side of the trans possibly... Clean the VSS on top of the rear diff?

 

thanks falcon, the vss we just had out when we had to replace the rearend(blew up). Last day it has working correctly off and on. Range selector was clean, any adjustments on that?

 

Don't think there are any adjustments... I could be wrong though.

 

Junior's tranny didn't really start doing this till he pulled home a f150 on the trailer memorial day. Does anyone have any diagnostic "exercises" to try? Tomorrow I am going to hook up and play alittle with the Auto Enginuity I got for xmas and see if anything comes up. We don't know if OD light is on or flashing cuz wires on end of shifter are broke but have been previous. Where did all the tranny guys go(Coon,Racerx,Madvan). Need help.......

 

Without checking codes I don't know where to start.

 

mark i will check today. thanks for responding, when i saw your name i remembered you were an engineer. I will get back..

 

got codes originally it had a coast clutch code, ten I cleared it drove and a P1728 trans slip code came on. It will shift on it's own but not till about 18mph. My other truck was doing this same thing and after I sold it about 2months later the tranny had to be rebuilt. The guy said all the clutches were toast, would like not to have that happen to this on. when is the coast clutch supposed to be active? with the AE hooked up and watching the shift engagement and coast clutch(cc) seems the cc was engaged in both 1st and 2nd. When shifted manually it did better. Hope this enough info to help.

 

The coast clutch will be on when the OD OFF light is lit, or when the shifter is in 1 or 2. The P1728 code means something is slipping when the trans is in 4th gear with the torque converter locked. The PCM doesn't get enough information to be able to tell what's slipping.

 

Well I guess we will change the fluid and filter and go from there. The fliud is bad.I was told it was rebuilt but this truck has had a hard life it appears. I wouldn't mind rebiulding it myself except for the coin. I have way more invested in this truck than I like. I guess the "good" price I thought i got had it's costs......

 

I had a pin broken off from corrosion on the harness connetor on the solenoid body. Replaced it and the harness plug. You can disconnect the harness plug and inspect the terminals- This is a long shot, but not unheard of.