Join Date: Sep 1999
Location: Vancouver, WA, near Portland, OR
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Re: Buying a \'77 J20
Great truck. Great and rather rare engine. Poor mileage, (all full size gas rigs have poor mileage). Q-trac conversion to part-time is a plus. Separate skid plate below tank would indicate a factory option. A welded plate on a aftermarket tank would be okay. Cherakee and Wagoneer tanks might be the same as J-truck. Aero tanks in CA makes larger replacement tanks with or without skidplate welded to bottom. According to my sources, '77 J-20 w/401 came with 3.73:1 axle ratio. Sounds like the old size 9.50x16.5 tires have stayed with the rig. Looks like the next step up in 16.5" tires would be 31/10.50R-16.5. Not many tires made this size, but should fit okay. Next size up is 33/12.50's which would need about a 3" suspension lift to fit. More choices in sizes available for 16" wheels than 16.5's. Tell your friend to go get it and enjoy.
'66 Jeepster Commando w/Buick 252/4.1L V-6
'70 Wagoneer w/Buick 350 V-8
'76 Wagoneer w/AMC 401 V-8 (sold)