I’ve seen this truck turn up for sale before... I think it’s priced too high. The GVOD and turbo do add value, but not ~that much. The vast majority of Banks turbo’s out there are the old non-wastegated style with the square air cleaner box. These are worth about $500 on the used market. The wastegated models go for a bit more, but not over $1,000. The used GVOD’s are also around $1,000. Having them already installed is worth something, but $15,900 is reaching! The 20 mpg figure is repeated often yet achieved seldom. You need 3.55’s plus overdrive, or double overdrive on 4.10’s to get there.... and probably only with stick shift or lockup automatic. The seller of my truck touted its ability to get 20 mpg, but it was 17 mpg all day long. I got 21mpg only once... on an all downhill run from Flagstaff to Lee’s Ferry. Jan’s truck got an honest 21mpg at 60-65mph as I personally experienced it with the ZF and 3.55 gears.
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2