I just bought a '90 F150 with only 74000 on it. 2H and 4H work great, but it won't go through the gate to put it in 4L. It looks like it's pretty corroded, so I have been spraying it down with PB Blaster for a few days, to see if I can free it up. Does anyone have any input or advice on how to proceed in freeing up this linkage? Thanks, Johnnyfever

 

get a dremel tool and go under the truck and cut the detent plate so you don't have to pull it to the side to get to 4lo that's what i did

 

I believe DieselBrad has a pretty good write-up on the TCASE linkage that seizes up.

 

Thanks for the replies. I'll get under there and take a look at doing that. Thanks again, Johnnyfever

 

Very easy fix, remove the bolts holding the linkage on and take the linkage off entirely and coat all the moving parts with anti-sieze. Same thing happened to mine.

Whatever you do, do NOT try and force it into 4L. You will break the linkage, and it is next to impossible to find a replacement.

 

Hey Alex, Thanks a ton for the tip on the frozen linkage. I took it apart this afternoon, and cleaned it up real good. Then I coated all moving parts with anti-seize. It worked great. It now goes into 4L and works perfectly! Thanks again for your help. Johnnyfever

 

I'm glad I could help! Also glad to hear that you can get it into 4 Low now.