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I've never understood why anyone would do all that fab work to install a P 4speed. What's the point? You still only have 4 gears.
Karl, assuming your car is IRS, get yourself a single side cover IRS trans from a mid 73 or later car. Then simply install a super diff. The super diff works exactly the same as a stock diff, but instead of relying on 2 spider gears to transmit the power, there's 2 extra spiders in there.
The next upgrade would be to change 3rd and 4th gears for the coarse tooth early types, and have the syncro hubs welded on. To convert the gears to work in your trans requires modifying the gears on a lathe. The 3-4 shift hub also needs modifying. Once you do those two upgrades, there's pretty much nothing that can be broken in the SSC trans.
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