Not too long ago, my buddy finally got his '89 3500 into the shop to yank the dead 6.2 diesel. Next thing you know, it looked like this:
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Amazingly, zero rust and the cab bolts all came right out.
I am super jealous of the zero rust... My rear cab bolts looked brand new though.
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Version 2 of the 4wd bushing is here, there wasn't enough compression on the detent spring so with the 4wd lever, it would pop out without hardly bumping it. Now the switch is actuated by a screw that rides inside the spring and only works the switch. I used a screw so you didn't have to worry about dropping it as it is all basically self contained once the switch is on the bushing. The way it is designed now, it should have the same pressure on the detent ball as it did with the old caps that were on mine.
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My buddy is going to machine me 1 to test and then I will have some to sell. It seems to work really well with the 3d printed one, I just don't trust the strength.