Question about 1995 GMC Safari

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When warm 4 speed automatic will not engage in third or overdrive

My 1995 safari awd does not engage in third or overdrive . The problem seemed to happen quite suddenly. Low and second seem to be ok. The temp. outside at the time was around -28 cellcious. The trans to my knowledge has never been rebuilt but has been well taken care of.

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This may or may not help, but here goes. Those transmissions tend to have a problem with the valve body seperator plate going bad. what it is, is the plate is a bit too soft and it has these check balls (looks like sling shot balls), that open and close. what might be happeneing, is when the tranny is cold the ball is small enough to let tranny fluid thru, but when it warms up the check ball increases in size, enough to lodge in the plate (since the hole in the plate has been enlarged due to the ball pounding it out), thus not letting tranny fluid enguage the correct upshift solenoid. Every tranny i have opened up has had the plate holes pounded out, and i've seen a few where the ball lodged it self in the hole.

Now i'm not sure if the check balls are for the shifting solenoids or not, but it could be. another thing is that there is a shitch or computer inside the transmission bolted to the valve body. when you take the pan off you can see it (i think you have to remove the filter, but i can't remember). anyway try replacing it first. i would just rebuild it tho. its not too hard, but you just have to be clean, and keep trac of the hundreds of little parts and how they go. there is some guy on ebay selling the rebuild kits, and step-by-step videos on how to rebuild specific trannys. he has one for the safari (all years). thats what i used when i rebuilt my tranny on my 95 safari. good luck

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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