The final drive ratio is different. If you have a B13 diff. you can just take the ring gear off of it and put it on your B15 diff, put in the complete 1.8 stacks and you have yourself a P11 box.
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92' SER -Pulsar/VVL combo on E85, 11.31 ET @134mph, Full weight, street car, A/C and sunroof, PTE 6262 at 19 psi (low boost) Now running Nismotronic SA
73' Datsun 510 with SR20DET (project)
73' Datsun Drag Car in the works