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You will have to screw the swap up pretty bad to only get 40mpg in the truck. My 78 Scirocco with TD 1.6 IDI with Giles performance diesel super pump running 21psi boost gets 47mpg with a close ratio 83 GTI transmission. Use the trans from your TDi for the proper ratios. Pick up will be about 1000 pounds less than the jetta. The front bumper cover from a Mk2 big bumper car fits the pickup with some massaging for a little better rounded front.
I have an 81 Scirocco S that will be getting a TDi swap eventally. Have all the parts, just not enough time. Can't wait to see the truck running.
:edit: we have 3 sizes of diesel pump nozzles in the states. regular car size, larger truck size, and then the semi pump nozzels have a larger lip on the larger truck size nozzle so it doesn't slip up and out of the tanks when fueling. Most 70's early 80's VW have large filler opening that the regular non flaired truck nozzles will fit in. I didn't have to change a thing on the filler neck of my Scirocco
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