Question about 1985 GMC S-15
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Posted on Jan 02, 2017
call a dealer and they will tell you you are suppose to change your transmission fluid every 2 years or 30,000miles but if you was carrying this much load you may have over heated the transmission so I would shop around and get a good deal at a transmission place where they can replace the filter and the fluid and adjust the bands on the transmission if needed
Posted on Jan 13, 2009
sounds like either a bad speed sensor or controller. shift points are too high, should be at 2000 or slightly less. if fluid is good and clean and shifts do not flair, check those control units. Not sure about calibrate...could mean out of calibration...Id ask
another tech about that. (i don't know everything!)
Posted on Mar 12, 2009
I would be interested in knowing if the thermostat is sticking open. Most Overdrives are prevented from engaging until the coolant temperature is over 177 degress F. Check you temp gauge...does it read Low? If so, change the t'stat, and see if that fixes your problem, or, if that does not help, get a complete transmission FLUSH, BEFORE you go out and get a rebuild. You just might save a ton of money.
Posted on Aug 29, 2009
If it won't go into overdrive a speed sensor within the transmission may not be sending the shift signal to the transmission. Check fluid levels to make sure that's not causing the problem. Also, check that the fluid is red color and clean.
Transmission probably needs to be serviced at a reputable shop if you want this problem fixed.
Posted on Jul 04, 2010
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