I didn't realize that they did away with the Swiss cheese frame
during '81. I thought it was between '81 and '82. But it doesn't look like this one has the holes, so I guess Shaun's right.
Dane - I don't think the VIN would tell us anything. The build date would help us understand when the change happened though. We have the info from both Rusty and Dad's truck, and several others I'm sure that might help us figure it out.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI