1993 4wd 6" lift 33's over drive wont stay, it keeps going in and out with the A/C on without the A/C on it seems to hold better, is it a transmission problem or a low end power? I have noticed a incomplete burn of fuel smell like a rick carb on a old Chevy truck.
Yall got ideas?
Also, is it electronic od or cable od?

 

Electrical O/D.

I'd tackle that incomplete fuel burn first, typical steps - how fresh is the plugs/wires/rotor/cap, what kind of shape is the plenum gasket in, how are the vacuum lines, how old is the O2 sensor, etc.

RwP

 

electrical.....great......thanks
I really wanna tackle the burn first plugs cap rotor and wires are a week old vac lines seem to be in order none rotted, collapsed or holes and pieces missing, plentum gasket I guess is ok cause there's no lopes and the idle is stable at 700 rpm o2 sensor has to be good it looks new too

gonna do a col check the old fashioned way Monday when I'm off I really hoe that's the problem in a nutshell cause if I cant replace that coil where it is I retire

 

Check your vacuum also; if the vacuum's too low due to another problem, you won't have cruise, and the ECU may well decide to disable overdrive.

I'd also do the visual examination; the ECU will TRY to correct for a leaky plenum causing low vacuum, but the best test is to peek down through the throttle body and seeing if the bottom of the plenum is dirty/oily or not.

RwP

 

can you show us some pics of this beast?

My first thoughts was gearing. Theres a chance you have 3:21 gears which is way to low for 33" tires. Depending on other factors 3:55 is borderline. Though, you didnt mention when the OD kicks in and out. Flat ground or some kind of grade? Also, I'm not saying you do or don't know, but are you 100% its OD kicking our and its just not the Torque Convertor unlocking?

 

That was my thoughts as well. Just how much are RPM jumping?

 

dd one gonna keep trying till I find something

Flat level I'll get up to 55 let it sink into od then it starts slowly slowing down and od kicks out that's what makes me thing its a fire issue, because thees no rpm jump,

I will be posting pictures as soon can I get my internet fast enough to upload something, youngest son has to work on the router first, but I war ya shes not much to look at

 

ok yall , got pics here they are

 

Still having the same od problem under 45 it works fine drives in od forever, above 50 it goes in and out of od constantly, I found if I turn off the ac it stays in od a little longer od button on the dash works cause if I press it od goes off completely, takes half a tank to go 50 miles too, and cruise control doesn't function at all, I asked a guy at work what it could be he said the od selonid in the transmission or the speed sence on the trans.
I gotta find out what is wrong before a sell it I love pickups but this is redulicous

 

I did not read the whole thread. You last post makes me think of my truck when I first bought it. Its the 3.9 2wd. It ran out of gas at 150 miles on a full tank! Doing the plenum fixed that. I also did the water pump and timing chain and pretty much all of the sensors in the throttle body and intake manifold when I did it. I also changed out the O2 sensor. I cleaned the intake and tb really well. I got 385 miles on the next tank of gas. Now that I have the gauge fixed it gets 320 miles per tank before I fill it. I usually have 2+ gallons in the tank which is 30+ miles when I fill up. You should also do a vacuum check and check the CAT to see if it is worn out or clogged.
The OD solenoid sounds like the right call. I would also make sure the throttle valve cable is properly adjusted at the transmission first then at the throttle body. I can't find the info I had at one time that describes the correct procedure for setting it at each end. I had a problem with my trans and OD seeming to be working wrong. I wasted money on a rebuild. It improved when I put in a new Crank sensor. Oh yea I also changed the switch plate which is under the rotor. That wire coming out of the dist connects to it.