What year van? Gen 1 has the RPO build codes on the glove box, and gen 2 has it on the passenger door jam. Scan the label for one with either of these codes :
GT4 Rear Axle: 3.73 Ratio
GU5 Rear Axle: 3.23 Ratio
GU6 Rear Axle: 3.42 Ratio
3.42s work just fine for towing. I towed 6600 lbs from MI to MD with 3.42s and no problems at all - and 12.6 mpg at 60mph.
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