I have a 4.0L with an AX15 and NP231 with the stock slip yoke. My transmission won't hold 1st gear, everything else is fine. It shifts correctly is nice and tight, and I just replaced the clutch and throwout bearing this summer , but did not replace the slave cylinder which is squeaky and likely in need of replacement.
Today I picked up an AX15, NP231, SYE, and new CV Drive shaft from a buddy of mine.
The transmission is from a YJ with a 4.2, the bell housing looks the same but it has an internal slave cylinder instead of an external like mine. He said the slave cylinder is brand new and has adapters that I might need to use it. The whole drive train is a lot lower on mileage than mine despite being from an older wrangler, the SYE is still in the box and the NP231 seems to be exactly the same as what I have now.
Educate me on the slave cylinder. In looking at this setup vs what I have in mine it seems like it would actually be better in a few ways. Its not dependent on a fork to move so its going to be less likely to wear and bind like the external slave and throwout will. The whole setup is protected by a boot which makes me think its going to handle water and mud getting in there a lot better. Plus this ones brand new and mine has 165,000 miles on it and it getting pretty squeaky.
Outside of ease of replacement, which is the better option between the two?
What is all involved in converting to the internal if I want to go that route? will my current master cylinder work for it?