TH350 shifting troubles

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Caeadiel

Junior Member
Joined
Jun 16, 2024
Posts
10
Reaction score
2
Location
North Carolina
First Name
Mike
Truck Year
1979
Truck Model
K10
Engine Size
350
After getting the transfer case issue figured out(grinding going into park, needed gaskets replaced and fluid topped off), I am now having issues shifting. Sometimes shifting from park to reverse it will go, with a clunk, but sometimes I’ll need to shift to drive, then try shifting back to reverse and it’ll engage, again with a clunk. Sometimes I’ll have to keep trying to get it to go. While driving there are no issues with it shifting from 1st to 2nd and so on. Just want to know what would be the fix here? Rebuild trans or what? I did check the fluid level and it looked fine.
 

NickTransmissions

Supporting Member
Supporting Member
Joined
Aug 3, 2023
Posts
494
Reaction score
1,040
Location
Las Vegas
First Name
Nick
Truck Year
1987
Truck Model
R10
Engine Size
350
After getting the transfer case issue figured out(grinding going into park, needed gaskets replaced and fluid topped off), I am now having issues shifting. Sometimes shifting from park to reverse it will go, with a clunk, but sometimes I’ll need to shift to drive, then try shifting back to reverse and it’ll engage, again with a clunk. Sometimes I’ll have to keep trying to get it to go. While driving there are no issues with it shifting from 1st to 2nd and so on. Just want to know what would be the fix here? Rebuild trans or what? I did check the fluid level and it looked fine.
Check your external shift linkage for anything loose, etc. If nothing out of the ordinary is observed, drop the pan and see if you have a bunch of burnt clutch material at the bottom...If so, it's likely the remains of your low reverse clutch pack. Trans would have to come out for overhaul.
 

Caeadiel

Junior Member
Joined
Jun 16, 2024
Posts
10
Reaction score
2
Location
North Carolina
First Name
Mike
Truck Year
1979
Truck Model
K10
Engine Size
350
I know everyone has been waiting with bated breath, but I finally got around to checking this and yes it was just loose linkage. The pin that keeps the rod in the transmission lever was missing and that caused the rod to slip out of one side so it wasn’t shifting cleanly. Pushed the rod back in and added a cotter pin to keep it in place and it shifts fine now! Thanks @NickTransmissions for the nudge to check it!
 

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