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I need a pre HO 4.0l long block. Anyone know anything about American Engine-X-change or can recomend another place? GM

I'm installing a 98 AW-4 into a CJ with a OBD1 4.0l. I have searched on many message boards, Google'd it to death and can't find much info on using the OBD2 trans with a OBD1 system. One suggestion is to change the speed sensor, rear I guess, for a earlier one and use the earlier TCU wired...