1994 chevy s-10 4.3L 4x4

your unit is a 4l60e , is the light on , ??? most of the problems that occur with your unit are valve body related , if the mileage is low on the unit there is a valvebody service cost about 3-400 bucks and may fix your issues as long as the fluid looks goo, red in color and not burned , let us know

jim

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The fluid looks good on it and its got about 120,000 mi on it.
I dont know what the valve body is but that sounds mechanical. im pretty sure that this problem is electrical.
the trany runs fine when the service enginge soon light is out, when the service engine soon light comes on all i have is 3rd gear.
i have askes several machanics about this problem and every one of them have told me it dosnt make any sence. I have some basic knowledge about cars but when it comes to this computer controled cars im lost. so the question still stands.
What would make a trany loose all the gears like that?

thank you for your reply jim but before i go spending 3-400 bucks i really want to make sure exactly what the problem is.

yes an no on the v/v , it si mechanicalbut computer controlled , shift sensors , pressure control solenoids all in the v/b if you get the codes checked and get a p1870 that is def the problem and the vb update will fix it, i worked for gm for 15 plus years i know the units very well

jim

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thank you jim for your help i am greatful for your assistance.
i dont what to be a pest but can you explain to me what is involved in a valve body update is so i can further understand my problem
thanks again
dan

very simple , the pan comes down , and the valve body is right there , abot 15 bolts it comes down and there are all of the valves and solenoids , there are amll mods along with replacing the solenoid that can be done to make it shift better and the pulse width modulator is changed to work or not work instead of coming half off or on , check around on pricing you may have better luck with a small shop that does transmission only and has been around for a while thansk jim oh and leave some feedback if you were happy with your help , we all donate our time here helping others free of charge this is a valve body not your type but it will give you an idea on what they look like

ok ill have it check out thanks for your help your awesome
how do i leave feedback?

right below my name it says give feedback

thanks for asking , it means alot , like a thank you

jim