Out of the blue, started slipping in all forward gears, no grinding or noise
was told by a repair shop that the gears were gone and it had to be replaced, could this be a computer proublem ,TCU or TCM , ECU or a filter
170,000 miles on the car, never had trans, proubles brfore
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It is not the motor mounts causing the problem, although given the age of the vehicle they may need to be looked at. Your transmission is slipping. Check your fluid level, and check for discoloration and odor. Overfilling a transmission will also cause slipping. If you don't know when the filter and fluid were last changed, it is probably overdue. This is a really messy job that is worth paying $75-$100 to a reputable shop to let them handle. The bands will probably need to be adjusted too, which is why it is a good idea to take it to a shop. Some of them will bring the pan out to you to show you the sooty looking material at the bottom, which is perfectly normal. What to look for is large chunks of metal or clutch disc material. If you see either, start saving for a transmission rebuild. I am not sure what flashing lights and speed sensor you are talking about. Are the headlights or dash lights flickering, or is it the police car lights in your rear view mirror? If it is the first, check your connections, your alternator output, and have your battery tested. If it is the second, think of a convincing lie but be prepared to throw yourself on the mercy of the court.
It's hard to understand when you say it feels like a manual shift. Noise? Feel? I do know that the 87 auto trans does have a weak 1st to 2nd shift drum (as explained to me by my mechanic) that makes a grinding, elongated shift under heavy acceleration when it starts to wear. Under normal acceleration, 1st to 2nd shifts were normal (crisp, immediate). Since that day 8 years ago, I've avoided starting off to quickly, and so far have saved myself a tranny overhaul.