Re: truck rear ends
37 with 18 wheels????????? All 32 up 1 1/2 ton trucks I have seen are 20 wheels. I have a 34, 38 and 48 all with 20" wheels. The early Eatons had a manual shift instead of vac like the later. Believe the 37 and 32 both had same frame width and possibly the same band around the rear end on both sides where the springs attach that lets the housing rotate above the springs. Measure that and you will know what will interchange. If the truck is the same wheel base, torque tube and ds should be the same.
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