Bolt size

[KarlJS]

Does anybody know the bolt size for the rear light brackets on a 39’ 1/2 ton truck? Mine are non existent and I’m wanting to run a tap to clean up the threads. Thanks

 

[Mart]

Mine is a 41 and just has coarse self tappers. If there are little inserts my money would be on them being 1/4 UNC.

You could try a bolt gently and see if it wants to start.

Mart.

 

[JSeery]

I would start with a thread chaser. They can also be used to determine the thread size. If you purchase a set(s) keep in mind that they often come as a set of coarse and a set of fine threads. They are very handy when working on older cars.

 

[Kube]

Does anybody know the bolt size for the rear light brackets on a 39’ 1/2 ton truck? Mine are non existent and I’m wanting to run a tap to clean up the threads. Thanks

My '40 is 1/4 -20. I'd think '39 would be the same.

 

[bosborn38pu]

My '38 is 1/4 - 20 (w/cage nuts inside).