NP 203 chain question
Hi everyone, first post here. I saw the post that said "no vehicle specific questions", but NP 203's are in a few different trucks so i figured this was the spot anyway.
My problem: A noise. Kind of a clunking. Only under load, in forward or reverse, in high or low range, t-case locked or not locked, goes with the vehicle speed not the rpm's. It goes away when i unlock the front hubs (and run it in lock).
My vehicle: a 78 chevy, with a 6" lift, TH350 trans, NP203 transfer case.
I blew up the transfer case a couple months ago, replaced it with another np 203 last weekend. That's when the noise started. It's definitely coming from the front driveline, because it only happens when the front driveline is under load. I thought it might be the front driveshaft, because it looked like the angle was just about maxed and the metal "stops" on the stock (but replaced in the spring) CV joint looked like they were hitting. So i ground them off. It didn't fix it. So i'm thinking it's the chain. And i think it's going to be a PITA to fix.
So, what do you guys think? Does it sound like the chain? Do i need to replace it, or can i use that "chain saver" thing that mile marker makes? And how hard is it to change the chain, and how do i do it? My haynes manual seems to be worthless for this.
Thanks for any help you can provide.