Sid I think our question is not about 1-3 being capable but will the OD handle it. I just talked to Hughes and they have 4L80E's rated to 1000 and 1500 HP and said they would not run either in OD at those levels, even on the salt. This seems pretty common for OD transmissions. Their recommendation was a 400 with a Gear Vendors which Sparky has,
Sumner