Engine/Transmission (1998.5 - 2002) Auto transmission - got problems

[Gizmo 007]

I got stuck the other day while trying to pull someone else out. Well, now my transmission shifts very erratically. I noticed it on the way home after being pulled out. I put it in drive, and it takes off like normal. To make it shift into second, I have to rev it to about 2800, then back completely off the throttle. Same thing to shift into 3rd. Once in third, everything is peachy. It'll shift into fourth like it's supposed to.



At part throttle, it shuttles between 1st and 2nd gear really bad. . ROMP ROMP ROMP back and forth.



Today, I noticed it acted really screwy in that when I'd hit a big bump, it would drop to 2nd.



Ok, first off, I don't have my tech manual with me... what should the pressures be in each gear? Secondly, could it be an electrical problem? Or did I just completely burn up the front half of the transmission? I don't think i burned the clutches, cause it'll still pull like the dickens on takeoff and the oil looks / smells new. Any ideas?



Thanks

 

[BFC]

Governor selenoid maybe? They are known for going out of wack, that or the transducer, maybe worth a shot.



Glenn

 

[B.G. Smith]

Trans

Look at the Throttle valve cable, you may have something holding the TV in the forward position which would affect shifting. bg

 

[inarush76]

As was mentioned check the tv cable and such. Also look at all the electrical connections especially the speed sensor in the tail housing as grass or other debris under the truck may have damaged or just loosened a connection. Give me a call if I can help.

James

 

[pcarlson]

I would agree with BFC, governor solenoid or transducer. Hook a pressure gauge to your governor port and take some readings. Mine were bad and caused erratic 2 - 3 shifts, found it with a pressure gauge.

 

[Gizmo 007]

Thanks guys! I'll try your suggestions. pcarlson, what should the pressures be?



I got a can of contact cleaner and dielectric grease for all the connections, and a pressure washer for all the rest . Gonna clean it up really well and find a leak that's been haunting me for the last month.



I'll report back what I find. Thanks again

 

[Wolfgang]

Colud someone tell me where the Governor Selenoid is or post a pix

 

[BFC]

If you drop the transmission pan and you'll see it. It's the shiny round brass looking thing on the valve body. You can't miss it. I'll see if I can find ya a pic.



Glenn

 

[Gizmo 007]

Ok, here's what I found... the 7-pin plug that sits straight up and down had been knocked loose in the mud (I guess). It was just sitting there, barely making contact. I cleaned it with contact cleaner, greased it with electrical grease, and pluged it in. While I was under there, I cleaned all the connections and greased them too. I also checked the T. V. cable, free as a bird. Now it acts more like it's supposed to.



I also found my leak... one of the cooler lines was loose. Easy to see once I washed all the mud off . Looks like oil could have been getting into the electrical plugs and messing with them also... dunno, but it works now... I'm happy.



Thanks a million!

 

[Gizmo 007]

here we go again

Oh NO!!! It's back! I just though I had fixed it. It started doing it again today! I checked and recleaned the plugs, to no avail.



Pressures in 1st and 2nd are kinda screwy... as I throttle up, the pressure will begin to rise, then fall off sharply... is it supposed to do that? Once I hit 3rd and OD, it falls within range (according to the book) and stays where it should be. Now I'm beginning to worry.



Then I found something interesting... If the T. V. cable is misadjusted, say, about 1/2 inch, will it cause this? Just curious. Looking at the cable sheath, it looks as though it has moved about that far across the clamp, but I cannot move it by hand . Should it be farther forward, or rearward? Gonna try that next.



How does one check the governor circuit / transducer?

 

[pcarlson]

Gizmo,



Put a pressure gauge to your governor port and have a friend drive while you read the pressure gauge. At idle you should have 0-3 psi, most likely 0. As your speed increases 0-20 your psi's will go up accordingly, 20 mph = 20 psi. from this point the pressures should double per mph gained, i. e. 30 mph = 40 psi. Your pressure should not spike and fall off.



There is no test for the governor solenoid or transducer unless you have a DRB tool handy. If your pressures are off replace both.