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Step 4: Picking the rear end.
Of every V8 240 I've seen, all the owers say that the stock 4.083 rear diff is no good. You spin the first 3 gears without trying and freeway cruising is an unacceptable 3,000 RPM.
Most people with this swap go with something around 3.5-3.6. I have the lowest R200 diff which is 3.133 from the Pathfinder. You guys with high power builds can search my posts or PM me for info on this swap.
Drag racing guys may want to think about an R230 upgrade.
You can skip this step until later, but you can save a little bit of money if you can take care of the rear end before you spec the driveshaft.
You should get together with someone who has a lot of experience tuning race cars. Pull out your engine dyno sheet (or the closest thing you have), your gear ratios, and the wheels you want to run. Have them help you pick the best rear end for you.
Unfortunately there are only 5-6 ring gear choices for the R200. You can do research on that.
tip: swap the magnetic transmission drain plug with the non-magnetic diff filler plug.
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