Backed the car up to place it on ramps, pulled it forward onto ramps and shut it off.

Get back into the car and press my autometer speedometer calibration button prior to turning ignition key on. This causes the speedometer to peg at 180 mph.

I then try to back off of the ramps and no luck! Car no longer has reverse. I pushed it out if the garage and then drove around the block..all other gears work fine.

???I'm stumped. I reset the speedo and zeroed it but still no reverse.

 

I'll be watching this thread as I will be swapping to a 4l80e and I also have a electronic Auto meter speedo.
Are you using a stand alone controller?
I hope you find what's wrong.

 

Factory PCM.

Trans was rebuilt less than 500 miles ago. Worked awesome until today.

I unplugged all the connectors and same result, no reverse.

I'm gonna drop the pan tomorrow and see what I see.

 

Wait. Someone here will give you something to check.

 

Ya, I hope you're right..

Thing was working perfect before this occurred. No issues in any gear. Blows my mind.

 

With the trans harness disconnected the 4L80E will still have Reverse and 2nd gear.
With the trans harness disconnected the 4L60E will still have Reverse and 3rd gear.

In other words the PCM/TCM has no effect on Reverse.
Note that these transmissions will max the line pressure when the harness is disconnected.

Is the shift linkage aligned? Do you have Park?

 

Yeah, the shifter and everything is aligned. It's been working great until yesterday.

Park works.

I diconnected everything to see if it was an electrical issue related to the speedometer as that's the only thing that changed since I last had reverse.

 

Well, all I can say is this:

I recently changed my tire size, and lost 2nd gear within about 5 min of one another. IN the end, it was a stupid coincidence, and my band was worn.

I am just saying, stupid **** happens at the same time....sometimes.

 

Any luck?

 

nope

took it to trans shop and they replaced rear band and freshened up the rest. now it's stuck in 2nd gear or 3rd gear they say. crazy

 

Uhg!
That stinks.
So you have a mechanical speedo output housing not a VSS?

 

No, its has electrical speedo from autometer.

 

Duh! My bad!
So your using the VSS off the tail housing to the VSS port on the back of the speedo?
I have the converter on the t350 thats in there now but uses a different port then the VSS
to signal the speedo.

 

sounds like the shop wants to give up on the trans and charge me for a rebuild and give me back the car with the transmission still fukt....

I'm dragging it to jakes performance for a stage 3 built unit if they are unable to fix it. I'm getting screwed on this deal by the locals

I'm using the signal from one of the pcm wires if memory serves me correctly

 

Wow, that sucks!
It sure sounds like they have no idea how to diagnose the problem or not very good with 80E's.
So, let me get this right.
They "rebuilt" your trans, it get stuck or only goes into 2nd or 3rd and they want to give you back the car AND charge you for a non working "rebuilt" trans.
I would have to have a talk with my attorney. Then bring car to Jakes.

 

yep , that is correct it's been two weeks as well. Icing on the cake is when he told me that he would build me another 4l80e that would work and for me to throw this one out.

 

Does it just have 2nd, or rev and second-the trans could have lost +12
What kind of shifter-I have seen the inner liner melt if it goes across a muffler, create a problem.
I would have someone put it in each gear, and someone underneath removing it at each gear stop and make sure each gear is there.

 

it has reverse and second

 

Sounds like they screwed up the vb to me.