Strange shifting problem

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brorunneraz

Junior Member
Joined
Apr 21, 2017
Posts
1
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0
Location
Arizona
First Name
john
Truck Year
1987
Truck Model
R10
Engine Size
305
Hi all i recently bought an '87 R10 with the 4 speed on the floor. I can not for the life of me figure out what is going on when shifting. I can start fine and i can put the trans in any gear and get it to pull forward. However when im driving the damn thing grinds like crazy when i try to throw it into 2nd. Ive made sure to push the clutch all the way to the floor. Its almost as if the clutch isnt disengaging but if thats the case shouldnt it grind trying to put it into 1st,low or reverse? Ive tried putting it all of the gears and slowly letting out the clutch and it has no problem grabbing all of them when im stopped. just not while rolling
 

1987 GMC Jimmy

Automobile Hoarder
Joined
Jan 23, 2016
Posts
5,848
Reaction score
2,387
Location
Mississippi
First Name
Jesse
Truck Year
1987
Truck Model
V1500 Jimmy
Engine Size
350
Hi all i recently bought an '87 R10 with the 4 speed on the floor. I can not for the life of me figure out what is going on when shifting. I can start fine and i can put the trans in any gear and get it to pull forward. However when im driving the damn thing grinds like crazy when i try to throw it into 2nd. Ive made sure to push the clutch all the way to the floor. Its almost as if the clutch isnt disengaging but if thats the case shouldnt it grind trying to put it into 1st,low or reverse? Ive tried putting it all of the gears and slowly letting out the clutch and it has no problem grabbing all of them when im stopped. just not while rolling

I wonder if it's a synchro failing. If I'm not mistaken the 'L' and '1' gears don't have them, and they can grind sometimes no matter what, but that's not the case here.
 

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