[Nicholas Vandall]

I have a 1992 Chevy K2500 and I just installed a rebuilt 700r4. It seems to be shifting well (rpm drop in gear) which seems normal. But fluid is not being cycled out of the pan. The only way I can get the truck to move is in drive going full throttle it'll creep along slowly. I am not sure how to fix it. Any input is really appreciated!!

 

[Nicholas Vandall]

Update: Even if the back tires are jacked up. The only way to get tire rotation is to go full throttle.

 

[xPosTech]

Why did you install a 700r4? Isn't the original tranny a 4l80e?

Ted

 

[Nicholas Vandall]

The truck had a 700r4 in it when I bought it back in July. It was pulled out of a field and pieced together, so I'm not certain if it's the stock tranny. But I am using the same tranny that I pulled out (that was rebuilt) and the same torque (old one)

 

[xPosTech]

Is the tranny acting the same before and after the rebuild? Do you know what transfer case is in it? Make sure you don't have any locked up brakes.

Ted

 

[tbplus10]

How do you know fluid isn't cycling out of the pan?
Autos are essentially a fluid drive, pump shooting fluid at adjustable vanes driving gears for the final drive.
If you aren't cycling fluid there is no primary drive.
Was the rebuild done by a reputable shop?
Possibilities are bad pump, or bad gasket/seal allowing air to suck in.

 

[RayVoy]

I've heard of problems like that if the torque converter isn't fully seated.
Did you do the install?

Did you hear two clicks when TC was being coaxed into place?

 

[Nicholas Vandall]

Before the rebuild the tranny would stay in Neutral while in gear. After rebuild you can hear it shift into gear. I don't know what transfer case is in it. The pump is the same pump from before the rebuild (worked even after the clutches burnt out)

When I put the torque converter on I heard the clicks and heard the pan turning when spinning it by hand.

The only way I can get any movement out of it is by going wide open throttle and then it will inch along slowly

 

[Nicholas Vandall]

Also; the rebuild was done in a buddy's garage who used to work for a trans rebuild shop. (So it could be done incorrectly) but I also tried with an old trans that definetely still worked when I pulled it. And I got the same result

 

[xPosTech]

With two trannies that limits it to the torque converter, a locked brake or dependent on the transfer case burned clutches in an AWD transfer case.

I'm not sure what a totally blocked transmission cooler line would do.

Ted

 

[thegawd]

A blocked tranny line would spew all it's fluid out of the vent tube on the tranny. I don't know much about the 700r4 but I know that it is pretty much a 4l60. The first thing I thought about when I first read this thread was it's the torque converter. And I still believe it is especially after the last bit of info... when I had my tranny rebuilt I brought 2 torque converters with me and the shop said nope... we never reuse them...

Al

 

[RayVoy]

And Al, what if the TC was empty?

OP, did you fill the TC with fluid?

 

[Nicholas Vandall]

The transfer case is the manual shift one on the floor (4L, N, 2H, 4H). The brakes are not locked because I can spin the tires freely by hand. But it could be the torque converter. I used 2 preused torque converters on the tranny. Maybe they're both broken?

 

[Nicholas Vandall]

Update: the Torque converter is sealed (no drain plug) and it was full with fluid from before the tranny **** the bed. So it's a possibility the torque **** the bed with it

 

[xPosTech]

Tranny shops will not guarantee a rebuild unless a new TC is installed. When a tranny grenades the TC will have all kinds of crap in it. No amount of cleaning will get it all out. A used TC can destroy a tranny.

Ted