trans issues

[woodsnake]

Well, to bring every one up to date, earlier this summer I swapped in an 83 5.0 and my rebuilt C4 from a 67 merc comet.
I had the car running earlier, and it seems to make plenty of power. It will shift into reverse, but when I try to put it in forward, nothing happens.

So, out comes the trans, back to the experienced builder, with the above story. He goes thru it and says the only think he see's wrong is forward apply clutch "O" ring is old and worn. Nothing else inside is wrong.
New "O" ring, back in car, car running tonight. Run the car to normal operating temperature, no weird noises, other than it has sat for so long with out running.
Same story, goes into reverse, but no forward. Now,
Before I go buy a new valve body for it, do you think a totally wrong band adjustment could cause all of this headache??

 

[stonecoldtx]

It sounds like there's a problem with the forward clutch pack and/or drum.

When you put it into reverse, the transmission uses the high gear clutch pack and the reverse band

When you put the trans into drive, however, it uses the forward clutch pack only

It's possible you have a problem with the valve body, but it really sounds like a problem with the forward clutch

 

[woodsnake]

It's all new clutches though. I completely rebuilt it, under close supervision.
All "performance" parts, and a shift kit.

 

[brianj5600]

A friend of mine had the wrong sealing rings on the pump and it did the same thing. The high reverse got pressure but none to the forward chutch.

 

[stonecoldtx]

It's all new clutches though. I completely rebuilt it, under close supervision.
All "performance" parts, and a shift kit.

That doesn't mean that there isn't something wrong with the drum . . . or, as was posted by Brian, the sealing rings on the pump--maybe even the sealing rings in the drum itself on the piston.

 

[brh66cobra]

Did he replace both piston seals or just the inner oring? If you drop the valve body you can air pressure test it thru the holes in the case. This way you can rule out the drum, piston seals and pump rings.

 

[woodsnake]

My builder said he air tested the trans. I'm going to try and replace the valve body over the weekend...
If not, the problem will wait until July when I get back......

 

[woodsnake]

Success! I changed out the valve body, and it wants to turn the tires with authority while in the air. I still have some timing and carb adjustments on the combo, but this is a big step forward!!