1999 Freightliner New clutch installed, problems.

Forgot to mention motor mounts. If they’re deteriorated you’ll still have issues.

 

Yes, you have to adjust the linkage. Ans yes, many say you should only adjust the linkage when clutch is new.

Me, i don't care what anyone says. Linkages don't come with 4-6 inches of adjustment to not adjust. You cannot account for all wear without adjusting the linkage, though it shouldn't be required every time you set the pressure plate.

When new, absolutely

 

I doubt it’s going to get better, only worse as clutch wears. Shorten it up a bit more. Right now you’re guessing. That’s OK. Best to get the 1/8” gap at forks. Clutch brake should fall into place. Also have a helper push pedal in, while you measure the clutch brake. I forget the exact size feeler gauge used, Business card works great. Should hold the card when pressed 1” from floor. Clutch pedal itself has an adjustment in the cab. Should be fine. Keeps pedal from going all the way to floor. All that said. Just shorten it up some.Try 1.75” first. Till clutch brake works good. Make sure you have at least 1 1/2” free play left. When I did mine with everything new. Final adjustments equaled 1 1/2” free play. Sometimes if they cut the flywheel to the max.spec it may need tweaking. In that case, you can increase the 1/2” gap at throwout up to 9/16”, to get the clutch brake to engage. or if needed, they have oversized 2 piece clutch brakes. 2 different sizes available. Sometimes they stack a couple stock brakes together. I doubt you’ll need any of that. Shorten it up till clutch brake works good. Keep at least 1/12” free play. Then every time it’s adjusted in the future, it will all work right. When you’re running low on free play, clutch brake might not work very good. That’s considered normal. Adjust clutch, good as new.

 

Was your distance from clutch brake to throw out bearing correct? As it wears, it will only get worse

 

I'm talking about underneath, clutch brake to TO bearing at 1/2". The TO bearing is on the left red line, clutch brake on the right. Should have 1/2" there. You may know this already, just tossing it in for reference