No forward gears

[michael_boomin]

My 1978 elco with a th350 trans is not moving forward. Reverse works fine , will not move in drive. I’ve recently changed the trans filter, pan and kickdown cable. Fluids have been filled. After looking around on the internet for issues I’ve seen there is a chance there it is the vacuum modulator or the forward clutches. If anyone have solutions or ideas that would be greatly appreciated.

 

[CopperNick]

Sure you put enough ATF in it? Not likely to be the modulor valve as it mostly deals with shifts while the care is moving or if you attempting to do a hard acceleration to pass another vehicle. When you dropped the pan and dumped the oil, was there any debris in the pan bottom? How much grey sediment was on the pan floor?
When you changed out the filter, did the O-ring for the old filter come out with it or did it stay behind? Do you have the old filter to check and see? If the O-ring stayed behind then the filter did not sit down tight and the ATF may not be getting pumped through the circuits correctly??


Nick

 

[michael_boomin]

Sure you put enough ATF in it? Not likely to be the modulor valve as it mostly deals with shifts while the care is moving or if you attempting to do a hard acceleration to pass another vehicle. When you dropped the pan and dumped the oil, was there any debris in the pan bottom? How much grey sediment was on the pan floor?
When you changed out the filter, did the O-ring for the old filter come out with it or did it stay behind? Do you have the old filter to check and see? If the O-ring stayed behind then the filter did not sit down tight and the ATF may not be getting pumped through the circuits correctly??


Nick

there was no debris in the pan and the filter had some sediment but nothing concerning as far as size or quantity. I did this a while so I don’t remember 100% about the o ring. I’m pretty sure it came with some so I probably put it in there. Also there is a whining noise coming from around the trans when it goes into reverse. I also changed my trans cooler lines around that time because there was a pin hole in one of the lines.

 

[Built6spdMCSS]

So how much fluid did you put back in it?

 

[michael_boomin]

So how much fluid did you put back in it?

I’d say it ended up being 4-5 qts

 

[Built6spdMCSS]

I’d say it ended up being 4-5 qts

That brought it up back to full on the stick with the car idling warm after dropping the pan?

 

[michael_boomin]

That brought it up back to full on the stick with the car idling warm after dropping the pan?

Yes it was full

 

[Supercharged111]

When did this start? Before or after the fluid change?

 

[michael_boomin]

When did this start? Before or after the fluid change?

After. Worked fine for a while , took it around the block and lost drive after about 5 minutes

 

[Supercharged111]

After. Worked fine for a while , took it around the block and lost drive after about 5 minutes

What was the driver to do the filter change in the first place?