I have a 86 300E and was wondering if anyone knows of a posi rear diff unit that would work in it, or of any aftermarket parts that have had success?

Thanks

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Thanks, Nels
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86 300E
93 W250 4X4 Cummins Power
72 F250 Highboy
89 S-10 408ci BBC
custom V Four Chopper
77 Peterbilt 352
83 Jeep CJ-5