If you have the scan tool plugged in and it can't read data, that's a sign you have a short in a module on the data bus. The only way a DIYer can fix this is to get a shop manual with wiring diagrams and component locations and unplug every module on the data bus one at a time until your scan tool starts working. Then you replace the bad module
SOURCE: Will not go into reverse/05 chev avalanche
chances are you have a transmission problem. If its just reving it means the transmission isn't catching. I would take it to a transmission specialist right away and be sure to call the seller. I would ask for your money back or have the seller pay for the repair cost, which may be a lot. Advice for the future: Always test drive the vehicle so you don't get ripped off.
SOURCE: chevy avalanche transmission problems
Hello;
Are you getting the check engine light? If so the electronics may have gone out. You may not need a rebuild but you won't know till you pull the oil pan on the transmission and inspect the contents. You may also have lost the neutral safety switch. It is mounted on the drivers side of the transmission. Check those out first and let me know what codes you get.
For Ponchoboy; the clunking and hissing you hear are teminal root causes. Drop the oil pan and if it has a lot of filings and metal it is time for a rebuild.
Hope this helps; Rate me highly;
Rich
RPM Northwest
SOURCE: 1993 1 ton 4x4 suburban with a 4l80E tranny 1st and reverse only
your getting waer or antifreeze into the tranny,you need too either put an aux cooler on it or replace the raidator!!!!
then change the tranny fluid again also drain the tourq converter!!!!
try this before you rebuild the tranny!!!!
SOURCE: Transmission only has 1st and reverse 98 dodge ram 1500 5.9L 4X4
If you removed the radiator, the transmission cooler lines on the bottom would be the first place to check. Wouldn't take much to get a kink in the line, and a possible cause for your shifting problems. Best of luck to you.
SOURCE: 1988 TH400 won't shift correctly
You will need a good manual that is focused on the transmission and possibly someone to lean over your shoulder to help you. Clean workspace is imperative. These are rather easy as you are for the most part stacking parts back into the housing when reassembling it. I would say look for a yard trans to put in it meanwhile and then you can learn at your leisure.
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