My 04 5spd manual ran 85 in 4th with gear to go.... it's a 4x4 ext cab with 4.10's. I wasn't upshifting to see what it would do.
My friends 94 Ranger, with headers, auto 2.3..... slammed to ground did 120 (but it took about 5 miles)
Your 88 2.9 liter must be better than mine!!! at 90 it would get a real nice burning smell that took over the cab....... ( this same friend wrecked his lowrider, bought a 1990 2.3) with big tires and wheels..... b4 it lost overdrive we would race to my house from school, hit a bridge going 80 we both got all 4 tires off the ground, we never went much past 85 in Ky the roads are too curvy, and hilly.
Frank
and once upon a time, I got my dually to 118 (ran out of safe rpm's) they don't handle so well that fast.
and my camaro to 146 (the front tires began to lift, and I lost stearing) crapped my pants and slowed down never to do that again.