So have you looked to see if the two senders are in one spot?

 

Well if he had jumped the leads the PCM would always see warm. now since the behaviour changes with temp the PCM still sees the tranny temp (maybe wrong temp though)

With the wrap your readings and the PCM feel for tranny temp will be closer to the real temp of the fluid. Don't be shocked if it reads much higher then! and don't remove the wrap to fool yourself and the pcm if you read too high

AlpineRAM

 

Just crawled under it and just have one sender going to the new guage.

 

He had to jump the sender then. My thought is the jump isn't making good contact. Did you see where the wire was jumped? A 1000 ohm resistor should be coded brown - black - red

 

No, I'll have to look it over and trace everything down. When I find it I'll check and make sure it is making good connection.
Right now I have to do the laundry Hubby is out of underware! HAHA. You guys have all the luck you get to play with your trucks and I have to do woman stuff. Oh well could be worse. Thanks for all the input. I'll check back later.

 

Make sure to let us know what's up.
I was wondering if maybe the factory sender got moved to another location that isn't so good, like the pan.

 

Okay the undies are washed now back to the important stuff.

Got up under the truck today and found the OEM trans temp sensor probe still intact and wired up to the frame. No wonder it doesn’t want to shift when it drops below 65 outside. It's freezing its little probe off.
From what y’all said I guess the best way to fix it is to cut off the probe and splice in a 1k (1000) ohm resistor. If you have any better ideas let me know. Where would I pick up a resistor?Thanks

 

Radio Shack has the resistors, 4 for a buck.
You don't have to cut anything unless you want to get fancy and solder/shrink tube the resistor in.
What I've done before that seems to hold up just fine is pull the connector to the sender off, the end going toward the pcm has male prongs with a split down the middle. Just push the resistor leads down into the split. You may want to strip an inch or so of insulation off a piece of scrap wire to slip over the bare resistor leads to prevent shorting out. Wrap the whole thing up well with electrical tape and cable tie it up high in a dry spot.

 

From what I remember, the PCMs on these trucks use the BATTERY TEMP sensor to lock out overdrive on a cold day. The OEM sender in the cooler line is just a switch. Over a certain temp it closes which signals the PCM to lock out overdrive, turn on the light, and lock the converter. The battery temp sensor is located under the left battery tray, and will lock out overdrive when below 0 deg. F.
We used to take the battery temp sensor and run wires into the cab, and mount it under the dash. I think this member may have a hydraulic problem.

 

Thanks infidel. I'll do that and let you know how it turns out.

 

I'm positive the tranny temp sender controls OD and the idiot light.
The battery temp sender controls the alternator.

 

I think your right infidel. These trucks charge so well that they can overheat the battery. The temp sensor tells the alternator to stop charging when it reaches a certian temp to keep from melting down the battery and tray.

 

I did the thing with the resistor like Infidel said on my old truck and it worked perfect.One more thing I was thinking ,are you sure its not the torque converter lock thats slow instead of overdrive.I had to slot out my tps to get mine to stay in .Just something to check.

 

The ground finally dried up enough where I could get under the truck this morning and put the resistor in. Worked like a charm, shifts out great. What would I do without you guys, thanks.