Progressively lost all gears?

[s10blaza]

So a couple weeks ago I took the Ty out to go turn in some movies. Let it warm up and started to head out. I noticed right away the 1-2 shift didn't seem as hard as usual.

By the time I made it out to one of the lights (about 2 miles) I had lost overdrive so I pulled over, fluid looked blood red, didn't smell burnt and the fluid was just a hair low (about 1/8 at the dipstick)

So I decided to head out to O'reilly to top off just in case and by the time I got there (another 2 miles at most) I had lost third and the 1-2 shift was starting to slip. So I topped off, put it in reverse to back out and nothing :tdown:

By the time the flat bed came to get it I had lost all gears, neutralizes in every gear, even manually. It's been sitting at work for a couple of weeks just sitting there ( I work at a GMC dealership). Our tranny guy is going to help me take a look once he gets a chance but he's been swamped with work these past two months

I've been trying to figure out what happened. I've broken 700s before but always lose 2-4 or third, spend a couple hundred and get back on the road. What do all gears have in common that would cause something like this? The torque converter bolts are tight and I haven't boosted the hell out of it since I'm still trying to get it dialed in with Tunerpro

 

[Quickstop [UK]]

Re: Progressively lost all gears?

TV cable? If it's not applying pressure to the valve body you won't get any gears...

 

[BoostedSUV]

Re: Progressively lost all gears?

I would check the TV cable but chances are your problems lie deeper than a simple fix. Sounds to me like you lost pump pressure if you've lost all forward and reverse gears. Get a pressure gauge hooked up to the side of the trans.

 

[s10blaza]

Re: Progressively lost all gears?

L

Please let us know what you find. That's how we learn.

4th gear is 3-4 clutch only. All torque for "OD" goes through the 3-4.

1,2, and 3rd gears torque goes through the fwd clutch. The fwd clutch can wear, and start slipping with little notice. I just experienced this with my 93. The fwd clutch "wore out". But it didn't "quit" in the short time your did.

Your total loss involves 2 clutches. So that's not likely. If it still has Reverse, it's not a pump problem. I don't get it. Let us know what it is.

Nope reverse is gone too

 

[s10blaza]

Re: Progressively lost all gears?

It does have a derale pan , it'll be one of first things I check before I drop the tranny

 

[jwaller]

Re: Progressively lost all gears?

sounds like the pump ground itself to death for one reason or another.

you will need to replace the entire cooling system to rid yourself of the contamination caused by such a problem.

 

[SY2932]

Re: Progressively lost all gears?

It does have a derale pan , it'll be one of first things I check before I drop the tranny

You should be cool since the trans filter pretty much lays on top off the cooling fins. The tops of the fins are about as deep as a stock pan is. It sounds pump related . Be sure to post what you find out...

 

[s10blaza]

Re: Progressively lost all gears?

We Finally pulled the tranny and found the reason for the pressure loss, I'm replacing that piston and rebuilding it, even though the tech said there was hardly any contamination

 

[s10blaza]

Re: Progressively lost all gears?

 

[s10blaza]

Re: Progressively lost all gears?

Put it back together tonight, looks like everything is back to normal, I'll make sure tomorrow

 

[s10blaza]

Re: Progressively lost all gears?

All gears were definitely gone, I couldn't back out of the parking space at oreilly. There was another seal in the input housing that was also shot, I don't remember which one, he definitely said it was a major pressure loss issue.

But all in all, thanks for the suggestions and advice everyone

 

[s10blaza]

Re: Progressively lost all gears?

So I drove it a solid 2 weeks when it mysteriously gave me the EXACT same symptoms!! Brought it back down and the pump took a dive

Not entirely sure why it would break

Anyway, got a new one from a tranny he had laying around, put it back on and drove it back home

 

[drturbo69]

Re: Progressively lost all gears?

There is a trany for sale at turbo buick $100 sy trans. Maybe a spare?
Not mine doc