No overdrive...

G

Gmoney

New member
So I drained all the fluid in the trans so that I could fix a couple stripped holes for the transmission pan. I filled it back up with fluid and went and drove it around today but when I shift it into overdrive it wont go in. The first two shifts are firm, checked the fluid when hot and its full. Its like it just hangs out in drive even though I put it into OD. Any ideas?
Is there an adjustment for that?
 
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jwaller

jwaller

Evil Genius/SyTy Guru
Re: No overdrive...

how high did you run the rpm's before you let off? if all that isnt normal is the 3-4 shift then your 3-4 shift valve is stuck in the vb. if you were having other issues with shift feel and timing then you might have a stuck gov or TV valve. but it sounds to me like the 3-4 valve in your case.
 
G

Gmoney

New member
Re: No overdrive...

I was cruising at 3000 then shifted to OD with my foot still on the gas and the RPMs never dropped... Is the 3-4 shift valve a hard thing to fix?
 
C

Captain Morgan

Moderated User
Re: No overdrive...

go out on a road you can do 55-60 on, take it up to normal OD speed and shift the trans back in forth between D and OD.

it sometimes works, sometimes doesnt, but in the case of a stuck valve it should work.
 
George Blake

George Blake

DONATING MEMBER
Re: No overdrive...

Check your fluid level again. It's probably a little low if you did nothing else and it started acting up. It'll suck fluid up into the trans and then the level will drop. Check it with the truck running on level ground in park. Drive it, pull over, check again, add as necessary. Don't overfill it. Some people tell you to overfill it. DON'T. It will churn the fluid into foam and the valves in the valvebody will have trouble exhausting fluid if they are backed up against fluid in the pan.
 
G

Gmoney

New member
Re: No overdrive...

The truck has been sitting for about 4 months, and just recently was when I pulled the pan and fixed all that. Could this be a combination of sitting to long and dirt getting inside when it was opened up?
 
C

Captain Morgan

Moderated User
Re: No overdrive...

doubt its from anything getting inside when opened up, odds are its from sitting alone.

Eric has the same problem when I sold the Duck (92 Ty) to him in October, I told him to do the same thing as I told you above and it worked out just fine and the Duck had been sitting for 3 years.

I had my truck do it once right after a trans rebuild, that was most likely from dirt, but it too was worked out in the same manner of D to OD shifting at 60 mph
 
G

Gmoney

New member
Re: No overdrive...

Ok, so I drove it today around 55-60mph then shifted it back and forth between D an OD. It finally goes into OD but there is a 2-3 second delay from the time you shift it into OD til it actually goes in. And it goes in really slow once it does, does it sound like it could get better the more I drive it or not? What do you guys think?
 
jwaller

jwaller

Evil Genius/SyTy Guru
Re: No overdrive...

sounds like the 3-4 shift valve has some debris in it cause a sloppy shift. continue to try what you did a few more times but with minimal power applied. you are slipping the band when it come in slowly and if you do it with hp applied you will burnn it. if it doesnt return to normal after a few more drives then you need to R&R the VB and clean the valve
 
G

Gmoney

New member
Re: No overdrive...

Ok, ya I tried again later today and the delay is longer, i'm not giving it a whole lot of power when I shift it. If it did go into OD it almost fells like its not all the way in because when I give it some gas it seems to go back into D. How hard is it to R& R the Valve body? Something I could do? Thanks for all the help
 
G

Gmoney

New member
Re: No overdrive...

So if I pull the valve body out, is there anything I should look for or know before pulling it out. From what everyone is saying there might some debris in there so I figure I might as well just pull it out and check it out. Thanks
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: No overdrive...

I'm surprised Austin hasn't posted "HHP :tup: " yet. :lol: Ild pull the vlave body and clean it up. You siad it sat for 4 months with everything exposed? I had a vavle body sit for two weeks and rusted up pretty good. None of my other ones ever did but this particular VB did for some reason. Its now worthless and just sitting in my tranny parts box. Wish I knew how to gedt rid of all the rust.
 
G

Gmoney

New member
Re: No overdrive...

What's an HHP?

And second, the truck sat for 4 months but it wasn't until 2 weeks ago that I pulled the drain plug on the pan and let in drain with the pan still on. I let it drain for a couple days then fixed the stripped holes and buttoned everything back up.
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: No overdrive...

Gmoney said:
What's an HHP?

And second, the truck sat for 4 months but it wasn't until 2 weeks ago that I pulled the drain plug on the pan and let in drain with the pan still on. I let it drain for a couple days then fixed the stripped holes and buttoned everything back up.
Click to expand...

Ild still clean the valve body off and make sure you can move all of the valves freely. HHP...Hartman High Performance. Brian Hartman is a guy that lives up in Denver, kind of a round littleton, he is one of the best tranny builders in the SYTY world, or so Ive heard. I met him a couple months back and seemed like a pretty cool guy. I just thoguht he wanted a bit more than what these trannies are worth. But he does seem to know his stuff. Ofcourse, I'm no authority on who you should listen to since I do all my own work. But hrere are plenty of builders here who can help you out if you need it; Waller, Hartman, RPM, George Blake.
 
jwaller

jwaller

Evil Genius/SyTy Guru
Re: No overdrive...

R&R the vb is easy and can be done by anybody. grab a pick and move all the valves until you find the one that doesnt move like the rest. remove that valve and clean the bore. clean the entire VB in gas or carb cleaner and inspect.
 
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