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Take the 26 sump to a decent fabricator and ask him to cut the diff off it and weld it up. The 26 sump has quite a bit of strength to it. While they are at it put a decent extension on it to your oil side of things is sorted. If your in Sydney Performance Metalcraft know what to do with it :)

While the engine is out i would also put a decent oil pump on it so you dont have to worry about pulling it out again any time soon

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The 25 sump and oil pan doesn't just fit straight on. There is some fabrication that needs to happen. After you bolt up the 25 oil pick up. The oil pan wont just go on. After you figure out how to get it on you will notice that the oil pan is hitting the base of the oil pickup. Then if you want you can grind the pickup base which I dont like to do because it can lead to oil problems later because of how much you have to grind off to fit the oil pan on the block. When I did it I simply modified the rb25 oil pan in that section. I heated it up and shaped the side in a round fashion to clear the oil pickup base. Then if I remember its still has one bolt I had to sacrifice which was no big deal as the sealant (silicone) took care of that.

What I would do if I did it again is as mentioned above use the 26 aluminum oil pan and cut the diff off and weld in parts that needs to be filled in.

Go on RaceFab and look at how they did it on there site. Or just buy one from them.

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