Question about 1987 Chevrolet R30

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87 chevy r30 trans doesn't want to shift and slips

The truck runs great for a while, like 40 miles, then starts slipping and not wanting to shift into Drive. Fluid looks clean, this trans only has 36,000 miles on it original, it came from an air force base. Truck also does not start until the engine cools completely, but runs perfect, while running. (except the tranny of course)

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Change the coolant temperature sensor.

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1 Answer

Drops out of OD.

Fluid Change has nothing at all to do with a fix
Nothing at all & on a worn trans can cause slipping
In your case I assume a shop gave it a try
The hard shifts tell you the valve body needs cleaning
I would first look at all body data related to the trans,whatever
your truck has TCM Module whatever
I would check all bulletins at a repair shop in their data base
I would have a mechanic ride with you to look at the trans
with the scan tool on it & watch the speed sensor & any
external sensors you may have for correct data
No also check the brake switch
Does it go into Lock-up in most gears (brake sw )

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1 Answer

1996 chev k1500-- when the weather turned cold the transmission seems to slip at start up in the morning. After I get going it seems to shift and run fine. Maybe feels a little soft on the shift for...

it sounds like the trans filter needs changed. the fluid will be thicker when its cold and will not pass through the clogged filter as easy. As you drive it the fluid heats up and becomes thinner then is able to pass through easier.

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My 2000 Toyota 4runner V6 125k miles automatic transmission started slipping on cold starts especially in the morning. After starting up, putting in drive and pressing the gas pedal first gear doesn't...

Low transmission fluid is usually the only reason power engages late or slippage occurs. But changing the transmission fluid again would not hurt. The stuff really shouldn't deteriorate like engine oil. Be sure to not run the vehicle many miles until the problem is completely resolved < 100 miles. One easy check would be to make sure the transmission lines are well connected and maintain pressure as well as fluid level. The good thing is that Toyota has a reputation of very good transmissions.

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