TH350 issue

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Gator

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Sep 28, 2014
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Location
Iowa
First Name
Gator
Truck Year
1983
Truck Model
K20
Engine Size
400
In December/January, my truck started to not move when I shifted it into gear unless I gave it a lot of gas. The worst instance was one night, it wouldn't move but would go in reverse fine. I would give it about 1/2 to 3/4 throttle and it would barely move forward and then slowly work its way to working condition.

Then in January, after a good day of it running the best it ever had, I went to drive it in the morning and same problem but worst. I put it into drive and it idled just fine but wouldn't respond to throttle. It eventually idled down the road far enough and I decided to stop to try shifting the gears and seeing if it was just cold. When I shifted back to drive, it wouldn't move forward and hasn't since but reversed fine.

So now my problem is figuring out why it won't work in any drive gear. When it's in reverse, it will move perfect. I did notice after putting it in drive, that the driveshaft won't spin. The transmission makes no noises, movement or anything when it's put into drive.
 

crazy4offroad

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Location
West BY-GOD Virginia
First Name
Curt
Truck Year
1979
Truck Model
K-10
Engine Size
350/SM465/NP205
Did you try L1 and L2 as well as 3rd gear? L1 and reverse share the same clutches.
 

Gator

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Sep 28, 2014
Posts
20
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Location
Iowa
First Name
Gator
Truck Year
1983
Truck Model
K20
Engine Size
400
Did you try L1 and L2 as well as 3rd gear? L1 and reverse share the same clutches.

Yes. It'll move through drive gears without doing anything.
 

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