Sigh...first major bill for owning used truck

learn how to drive the truck without a clutch brake.

Likelyness it is the trans seal, but replace the rear main too and the clutch.

 

The whole side not working may be the shift rails .

If the whole trans was bad wouldn’t it be every gear ?

 

To answer this part of your question there is no doubt I would not replace the clutch too you would be foolish not too

 

Usually they require you to put a new clutch in for the warranty to be valid?

I know Eaton requires a new clutch and a very specific oil on the same bill.

 

Absolutely replace clutch, get a good 2050 Eaton easy pedal. Should last 1 mil miles . Might as well do rear main seal. Only extra cost is removing flywheel, and that’s only if it doesn’t already need to be resurfaced. It will definitely start leaking, probably before 1 mil miles if it’s not already. Clutch brake not working isn’t because of oil. They’re made to operate with grease on them. Most likely likely it’s worn or linkage is worn or out of adjustment. As mentioned make sure the trans is actually bad, not just a linkage or something that can be fixed by removing the top.,when mine went bad, a friend pulled the inspection plate, could clearly see and move the upper set of gears. I think it’s called the right bank. It’s the highest gears in the trans. Maybe was ran with low oil? I don’t know much about transmissions. A good mechanic can probably tell you for sure.

 

Pull trans and have rebuilt by a reputable shop. Reman trans are gone through on assembly lines and by tolerance specs. A good shop will replace all parts necessary to see you another 800k miles down the road.

Replace clutch, resurface flywheel - and while the trans is out, replace anything you think would be easier to do at that stage.

That's just my 2c, NZ/CAD/USD or pesos.

 

Don't own a truck yet but I see some really good mechanical advice. Where/who would resurface a truck flywheel..kenworth/machine shop?
Also is there any throw out bearings he should replace?

 

You'll be glad you found here then, after a bit of looking around.

Back when I was company driver when I joined this forum - I went . . .

"SSSSHHHHHHH - the big boys are talking" - and just read, and learned. And there's Sooo much to learn.