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850 intermittent tranny issue 850 1997

Scan the car for errors, eventhough there is no flashing arrow or check engine light. Sounds like limp home mode, stuck in 3rd. Next time that happens, shift down to L and see if that makes a difference.

A tranny flush is called for, just make sure that you flush 2 quarts at a time unless you are just emptying the sump - then measure outflow and put the same amount back. I found that dumping the sump works best on a cold, hasn't been run for a while, tranny - don't start the engine. A lot of the fluid in the tranny internals migrates to the sump overnight.

A fellow Brickboarder suggested that I use Valvoline red lable ATF, for 'older cars'. I haven't done that yet, it is on my list of thing to do after the brakes are working again.
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My back feels better when I sit in a Volvo seat






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