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Ok, thankyou. I looked antheall over trying to find that info. my pump has the green tag on it which i believe is the good one. I had suspected the previous owner h anthead changed things. The wiring had been messed with under dash and steering wheel has been off also. No horn button or wires...

what type of gauge are you talking about? and where do i put it? was also told it can be tge eprom bad, but i cant seem to find one. The computer was not even in the holder in the dash so im trying to see if its even the right one or maybe he changed the prom out?

Epc solenoid? Im sorry. This is totally new for me. Ive only had the truck a few months. Ive been fixing it up. Its got a lot of miles on it but runs like a top. Was just hoping it was an electrical issue. Fluid is red and nice. No metal flakes or burn smell.

But it will shift normal if i dont get on it. If i take off fast or jump on it it will kick down to second or first and stick there. Pull over and shut it off for 30 seconds and restart it and shifts fine again. Wouldnt it just keep slipping if that was the case?

I believe its all stock. Could be the map sensor also? Will wastegate solenoid cause shift issues too? I will be cleaning all the ground wire connections next. One by battery was very loose.

The truck runs perfect, whats a stepper motor? Dont see it on autozone site. There were no spacers on sensors. Just the bracket and oring. Neither had any metal shavings at all. Im very new to this diesel. First one i ever had.

Map sensor and wastegate solenoid. Read that map can cause shifting issues. Says pcm reads input and output speed sensors or ignition switch issimue, or could be the pedal sensor?

Ok codes are 34, 78, and 87

These are the numbers but dont know where to get tested or replacement? was told i may need updated prom?

Havent run codes yet but just replaced both speed sensirs, changed nothing. I was told my prom might be bad? or my computer? how or where do i find these?

Ill try that today thankyou

The light doesnt come on but im going to try getting it scanned.

Thankyou, i thought that was the one. I drove it tonight after it was shifting normal, got on it a little and was stuck in 2nd again. I shut it off for a minute, started up and shifted normal again.. Quite a pain

Hello, i just purchased a 94 c3500 turbo diesel. How do i kn Orlandiniw which tranny i have? its auto but no numbers i can see. Also when its first driven it wants to stay in first and second. Once its been driven a ways it shifts fine when going slow. Under power it stays in 2nd when first...