Question about GMC Sierra 1500
Also you have to gas on it to get it to down shift out of overdrive going up hill
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Posted on Jan 02, 2017
I had an 89 Suburban that started doing the same thing. Change the fluid/filter and add a quart of Lucas Transmission Fix. See how that does. Ultimately, you are going to have to rebuild or replace the transmission as the problem will only get worse in the end. Mine finally went down completely and cost me about $2700 to rebuild.
Posted on Apr 28, 2009
rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.
Posted on Jun 17, 2010
The netural saftey switch can collect moisture over time
I had a netural safety switch that was flooded inside the plastic casing an cause an intermitting short while driving.
OPEN this link HERE for the picture of the netural safey switch.
Inspect the shifter linkage,r and cable to the switch.
If the netural safety is loose then it will also give false information to the trans computer.
Make use the switch is mounted perfectly.
If you see water inside the netural safety switch then drill a small ~1/16" hole on the lowest part of the switch to drain the water out.
BE CAREFUL. The platic is only 1/8" thick!
Please keep me up to date on the repair.
If you has more question then pleasde email me.
Posted on Jan 16, 2011
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