Cat 2ws issue

Ok guys, I'm a little perplexed. This 2ws was rebuilt around 100 to 150k miles ago. It has sat mostly since February and didn't get driven much before that.

The issue is it has a slight shudder/vibration like it has an injector issue. I picked it up Tuesday and put 2500 miles on it and even put some Lucas injector cleaner through it to see if it would clear up but it didn't.

The part that has me perplexed is its not that bad until 5th and 6tth gear in the 1200 to 1400 rpm. 5th gear shakes the entire truck and vibrates the dash, teeth, sack, and every thing else. 6th isn't as bad and then slight again after 6th.

It's also worse under a load.

I'm thinking that because of switching from high end of low range to low end of high its dumping more fuel causing it to be worse?

I havent checked the fuel filters yet, but they aren't cat. I drained the water separator and it seemed fine. I'm going to talk to talk to the old cat mechanic where I park at but I'm just curious at this point.

Also, slight blow by but not bad.

Guesses?

 

Also, oil pressure is 65 ish under power and temp stays 190 ish

 

No I'm not. I just got home about an hour ago. I'm going to check it thoroughly tomorrow.

 

Well, the ujoints are fine but it sure looks awful wet all the way down that side the puke tube is on.