Speedometer not working?

Do you have a CEL??

Is your tac working (its pickup is in the transmission but is internal)?

If the tac isn't working, it would point to a wiring failure. Though you probably didn't unplug that harness.

If all you changed was the spees sensor, and now the tuck isn't working, then it sounds like either you bought a DOA sensor, or it was broken on the install.

Lets take away the tranny not shifting, the speedometer not working points to a sensor failure...

Now this may be the cause of your tranny not shifting. They don't like to be run low on fluid, but as a person who drove one with a serious leak for over a year, and ran all kinds of fluids in it (like Destron, Mecron, etc) they will still shift with low fluid and wrong fluid, just poorly.

(Tranny since rebuilt, all new internals and will only ever have valvoline atf+4 used in it from now on)

I really think the sensor is your problem.

But lets try another test... Unplug your transmission harness round 8-pin connector going into tranmsison above the shift linkage) and see if you can manually shift through the gears...

The solenoids seem to get clogged or go bad at random, especially for the 1-2 shift...

 

If what you're getting is a common rebuild, you're going to have to worry about this problem again.

But while it's there, see if you can get them to install a pan with a drain plug in it, preferably also a temperature sender port, and to put a remote filter in place of the check valve in the cooling line. (If the shop wasn't already planning to delete that check valve, that's proof that they know squat about these vehicles. Tell them to do it.)

When you get the truck back, install a transmission temperature gauge. Then never let it get above 200F in the pan or 230F in the hot side.

Replace the remote filter every 30,000 miles, and do a band adjustment and fluid change every 60,000. The band adjustment isn't really necessary until 90,000 but you've got no other excuse to drop the pan at 90 and 120,000 is pushing it. The internal filter need never be replaced if you've got the external filter on.

If you're not getting some solid upgrades right now, well... drive like you've got a fragile transmission, because you do. Know when to knock it out of overdrive, too.

 

i need to delete the check valve next and install a remote filter and temp gauge, its on my to do list...

I rebuilt using "bullet proof" internals, and used some thinner steels to allow more clutches..

I put a plug in, but am definitely going to add an in-line oil temp sensor, and an inline remote filter.'
There are good DIYs here, so I know how I'm going to do it, I just have other things I need to do first. That check valve thing scares me after reading horror stories.
So far the transmission runs better than ever, which is great, cause it was my first ever time cracking open an automatic..

 

ok so what will all that do exactly you have to forgive my ignorance, i dont know jack about transmissions at all? im not sure what they are doin all i know is that the tranny is more then likely out on me and it needs a rebuild they said the pump was making a LOT of noise and it was leaking fluid im gonna get a hold of them later today and find out exactly if they have figured anything out on it or not? thanks for your response and i dont do anything to hard on the tranny i dont tow very much and i dont take it off road i just camp n fish and go dirt bike riding thats bout it

 

oh and another thing when my crankshaft position sensor went out on me the code reader was saying something about the transmission sensor or something like that and it wouldnt let the computer thing reset that code so is that something that i should inform my transmission shop or do you think that they will pretty much figure it out? this is the first time i have ever had any problems with ANY transmission so its also my first time dealing with a transmission shop? this transmission had a lot of miles on it im not sure if it was the original transmission or how often it was maintenced but when i got the truck it had almost 190,000 miles now it has over 200,000 on it and im getting it rebuilt just dont want to have to go through this again

 

Torque converters are the weakest link in these trannies. Make sure they put in a GOOD one, and not just a 'stock replacement'.

Extra clutches and steels won't hurt either.

Sonnax Sure Cure for the valve body.

I think some trans codes are just the PCM misinterpreting data is is receiving, when something else goes wrong. I got TCC codes when my engine was misfiring..... solved the misfire problem, reset the PCM, no more TCC codes.

 

Well I just got done flushing it out with a garden hose. Everything should be great now. Gonna add the Sea Foam next. lol...

Seriously.....I didn't press the sensor connector on hard enough and that was it. Thanks for all the serious Help and advice....
Mike

 

Just sayin, same thing happened to my friends dodge and did that ... works fine now, just thought id say my idea... But disregard everything I said cause I clearly am lost. I apologize.

 

Seafoam goes in your gas tank and intake, not in the transmission.

 

Get a transmission cooler and a deeper tranny pan. Heat is the killer of all things. Including beer. Which is why I drink it cold!!!!