I'm not sure. The turbo engines have forged pistons. From what I've heard, the stock Ranger ECU should be ok up to about 10 pounds. I don't know how good the stock pistons will be good to, however.
1991 Ranger XLT 2.3 5 speed with over 328,000 miles
1995 F-150 XL 4x4 5.8 351 with a 5 speed ZF Manual. 258,000 miles