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Transmission Shift Problems

Old 03-09-2019, 09:50 PM
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Default Transmission Shift Problems

I have a '93 K1500 Z71 with an automatic transmission that decided to stop shifting with no warning. I drove the truck into work, and on the way home it decided to not shift into the overdrive gear. I can manually shift the transmission from first gear to second, but it will not go from second into drive. Anyone have any suggestions?
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Old 03-09-2019, 10:09 PM
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On level ground, when hot after driving for a while, in park, is it at the full line on trans dip stick?
Have you ever serviced the transmission with new fluid & filter?
A OBD1 scanner may provide more insight with stored problem codes?

Last edited by Soft Ride; 03-09-2019 at 10:12 PM. Reason: add obd1
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Old 03-10-2019, 03:13 PM
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Originally Posted by Soft Ride View Post
On level ground, when hot after driving for a while, in park, is it at the full line on trans dip stick?
Have you ever serviced the transmission with new fluid & filter?
A OBD1 scanner may provide more insight with stored problem codes?
When the problem first occurred there was no fluid on the dipstick. I put 3 qrts in, went through the gears, and checked the level in neutral on level ground. The level is good, and the problem was still there. I even tried manually shifting through the gears. First to second is good, but going into drive or over drive is where the problem is.
I am not sure if the transmission has been serviced, but the parts are ordered and the job will get done.
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Old 03-10-2019, 03:22 PM
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Sounds like you burned up the 4th clutch.
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Old 03-10-2019, 05:51 PM
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3 Quarts low, this can overheat clutch packs or worse, unfortunately.
Dexron VI (6) is the latest GM fluid and recommended. When you say parts ordered, do you mean gasket, filter & fluid?
Take a photo of inside the pan, You may see fine black particles,or metal shavings etc.
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Old 03-10-2019, 05:57 PM
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Originally Posted by Soft Ride View Post
When you say parts ordered, do you mean gasket, filter & fluid?
Take a photo of inside the pan, You may see fine black particles,or metal shavings etc.
Yes, the parts is a filter kit. I want to go this route first so I can pull the pan to see what it looks like inside. If I do see black particles, shavings, etc. then I know it is some thing more serious.
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