I could only imagine how poorly that setup towed any real weight with the 3.23 gears.
I found my Express van marginal with 3.73 gears and the 4L85E. That was with a 300 hp Marine Vortec 350 setup making ALOT more HP/TQ.
At the wheels it made
170 hp @ 3,000
205 hp @ 3,500
225 hp @ 4,000
230 hp @ 4,500
Torque started out in the 280 range, peaked at 303 @ 3,400 but took a nose dive above 4,000 rpm.
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