But thats just me, I can't speak for everyone else. Once all is out you can remove the fluid filter, make sure you remove the O'ring as well. Hope this helped give you some sort of reference. ! But is it okay to use the ecm I have? All and all its not a fun job. A repair manual will show you exactly. Install and tighten the bolt to approximately 15 foot pounds of torque, install the vacuum hose after blowing it out from the top, remove it from the vacuum tree by the brake booster drivers side and blow all the tranny fluid out, and if the hose is rubbery from being saturated in fluid, replace the top part which is about a foot long.
Now take a screew driver a hammer and drive the seal out, you will loose some fluid but not much. I also got the computer along with everything. Your life is made easier if you remove the drive shaft 4x4 which unless you are magic you must remove the exaust pipe. Let us know how it turns out. If it is a cost issue where he has a good trans out of a 1994 he might see if a salvage yard will do some partial trading for the correct trans.
Today I must have gotten my 20 minutes on the computer, because I got error code 16, which is vehicle speed buffer. If you put it in drive, it stays in low. The stock speaker will then be exposed and need to be pulled out, only after unsnapping the left side of the speaker mount. The transmission will work without this line, but the shifts will be hard as if the throttle was all the way to the floor. The function of this line and the modulator it goes to, is to give the transmission some sense of how much throttle is being applied during a shift to make the shifts softer or harder depending on load.
I know that my Tach won't work if I do this because I know a Tachometer wasn't available until '92. I would just go with the ecm you have. Regular code readers like a snap-on mt-2500 can read transmission data, as where other odb2 readers will not. I ordered the 4500 and the tow package and it worked great for me. There should only be one bracket holding the hea … ter core in the housing.
You have to clean out the plug going into your Trans I used wd-40, probably not the best thing but that's all I saw and then blow some air into it and lwt it dry unplug the battery for 30 mins and worked just fine. I am sure you have a 4L60E however. Look underneath on the transmission. But first block the wheels so truck don't roll. Use no gasket sealer on the gasket it can find its way into trans Fill last 2 quarts on level surface, vehicle running in park, and check often to prevent overfilling. Oh, and you should not have a problem with the tach, that should still work. Some peopel mount tranny coolers in different places.
Crawl under and just follow then from the tranny forward. Then remove the 20 or so bolts holding the pan up. Because since my auto is elec controlled I didn't no if it would mess up the ecm if I just disconnected the trans control harness. In general my 94 ran better than the 89. More likely the trans is a 4L60 or 4L60E depends on the time of the year.
Cant tell which is neg or positive. If you know your Year Make Model, put it in the selector so that we can guide you to a product that fits your vehicle. If you have more specific questions feel free to add answers and I will do my best to help. What I do is remove the all but 4 bolts from the pan. Check all the fluid levels fine. This way the fluid is cooled in the radiator as well as the auxiliary cooler. It is not hard to change; just messy to do.
If miss-adjusted you … could burn the clutches and gears completely up More Info, If You Do Not Find A Modulator, You Could Have a Different Trans. Be sure to scrape the old gasket off and replace it as well, as leaving this on could cause leaks …. I don't like autos, I just prefer shifting gears manually. Dude, there isn't a modulator on a Chev truck of that era. If you have pump noise, I would look under the distributor there are two sets of wires that is your spark modulator. There is quite a bit of difference between the 89 and 94 engine. I ordered the 4500 and the tow package and it worked great for me.
Shop says it needs to be rebuilt. It screws in and usually has a round head on it. Then put it all together. First the case doesn't have the bosses for the neutral safety switch which is on the drivers side of the case. Remove the Vacuum hose, remove the 10 mm bolt,catch the clamp, place drain pan ice cream pail under the modulator to catch tranny fluid if it drips.
I would just go with the ecm you have. This pan is located on the bottom of the transmission secured by twenty or so 10mm bolts. After replacing you have to set the modulator pressure by connecting a gauge to the tranny, removing the cover from the modulator valve and turning adjustment bar underneath. If you put it in low and lift the handle, it will go into second immediately and when you move to drive---nothing. If you're not gonna add this switch then I won't help you. Having a manual or automatic transmission determines the steps to be taken.