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Q: I am swapping transmissions

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The s5 47 went out in my 96 f250 7.5 460 ranch truck. I have an 88 f250 with a 7.5 460 also and it has a s5 42 l. I know the transmission is a little weaker but I just need it to keep me going until I Have the money to put a s5 47 back in it. I alredy bolted the s5 42 up to the 96 and every thing fits but I also need a new slave and master cylinder and I was going to make Shure it fit before I bought a new one. So here is my question when I put the s5 42 out of the 88 in the 96 do I need to buy a slave and master cylinder for the 96 or 88? Thanks
My car has a manual transmission.

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