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Please help, I've got engine oil in clutch reservoir (?) I recently became a proud owner of a 4WD 89 Comanche 4.0 paired to a Peugeot transmission, but the previous owner lost the clutch while delivering it to my house, making clutch-less shifts. We added fluid to the master cylinder reservoir, pumped the clutch, and the fluid turned black. Now the clutch has some pressure, but quickly loses it as it drips from where the rear main seal would be. The seller mentioned that the rear-main seal was most likely bad, and it explained the oil leak that I saw when I test drove it. The master cylinder doesn't seem to be leaking, nor does the line leading to the internally located slave cylinder. The engine oil is pitch black and very low. My best guess is that the slave cylinder blew and is ingesting oil from the rear-main seal leak? Has anyone encountered this? I tried to find videos on how to replace the slave cylinder when it's internally mounted, but had no luck. I wanted to get it running myself so I could plan out what the build would be, but now I'm wondering if I should send it out, swap to an AX15, replace the clutch, and convert to an external slave cylinder. Any advice is much appreciated

Hi guys I'm looking at changing my RMS on a 4.0 that's out of its bay and is being used for a 2.5 to 4.0 swap. As far as I know the rms does not leak. but it has 180k miles on it, and the engine's already out, so as dad says, 'better safe than sorry'. That being said I figure I should replace the rms while the engine is divorced from its comanche since idk the condition of the rms. So I've checked Rockauto and they have lots of options. Should I go with one-piece, two piece, brand...? I figure one piece would seal the best. I just don't know if it would be better in the long run cuz I'm pretty sure the next time I'd have to change it it'll be in the truck and a one-piece unit would be harder to remove. FYI first time changing rms. Also, going with the cheapest one-piece oil-pan seal rockauto has.