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Could be that. Or maybe you have a bend in it with a radius that is too small. My recommendation would be to get it as straight as you can in the truck without taking it out, loosen all the hold downs, and see if it spins freely. If it does, it’s one of those two issues. If it does not, you may...

REF, You’re the man. You got my hamster back on the wheel. At some point long ago I must have COMPLETELY disassembled the 90° adapter and put it back together incorrectly- or maybe even my brother or my son did it since we were all fiddling with it at one point or another. For life of me I don’t...

I can assure you that this exact setup worked properly for the previous 7 years I’ve owned this truck. It worked until I took out the Speedo pinion gear to test something else a while back. It’s been out for longer than expected (several months), but nothing else has been changed. This is the...

-If I spin the speedo cable from the T-case side, it needs to spin counter clockwise to simulate moving forward. -looking at the output from the speedo pinion on the t-case, it spins counter clockwise as you look at it. These two are opposite. So this means the gear is spinning the wrong way...

I haven’t replaced any parts. Everything is the same. I agree that it makes absolutely zero sense. With that said, I did partially disassemble and grease the 90° adapter. But there isn’t really anyway that could be put together incorrectly since it is also gear driven and has pockets for all the...

ok... I have found the issue... There is another marking (see pictures). I assume that, like me, you have the orange 35 tooth speedo drive gear. if that is the case, you will see another marking on the opposite side of the orifice. now, that being said, I put mine to that setting and everything...

I also found this picture. It confirms to me that there are no other markings. What we are seeing on our t-cases is all we get

Here are a couple pics from my endoscope. One is where mine was set before adjusting it. The second is where I finished. It matched what you set yours too. Mine also does not work and I KNOW my worm gear is good because it was working before I had taken the Speedo gear out and put it back in as...

I found THIS SITE. It doesn’t give a measurement and it doesn’t specify NP218, but might be worth cross referencing to see if it’ll fit. I can imagine they used a ton of different sizes across their line of T-cases.

I honestly just threw an o-ring on my drain and fill plugs. No issues. As for replacing the gear (if necessary) you really only need to take off the yoke and tail housing to replace the gear. It’s not too bad. Here is a link to a guy who tore down an NP218 to give you an idea of what you’re...

It looks as though I am just a few days behind you because I came here looking for the answer to the same problem. I appreciate your following up on this thread. Just know You were immensely helpful to at least one person that may or may not be a window licker. Haha. I will do my part in adding...