Rare find, but nothing useful for you on it unless you want to put an IDI in a half ton van, witch is totally fine as well, but that's got the old RUG 4spd OD tranny, looks exactly the same as the old top loader mustang 4spd, but this one, 4th, is OD, and a very light duty transmission. Clutching system will be linkages on that 81 as well.
John I'm pretty sure the pedals out the 81 would work with a Hydraulic slave set up. He would just need to modify the first piece of clutch linkage that goes thru the floor. Convert that linkage into a push rod.
The hydraulic clutch master mounts to the floor where that linkage goes thru.
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WIGUY I'm doing the swap in my 89 E350 gasser. The pedal set up is the hardest part of the swap. I lucked out and found and bought a complete 88 E150 5spd van from a salvage yard. I bought the whole van to get the pedals and steering column. I'm swapping a highly modified 300 inline 6 with a NP435/NP205 combo into my van.
Here's some pics of my donor:
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The clutch master cylinder uses a remote reservoir. You can see it just to the left of the brake master in this pic.
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It will make life a whole lot easier if you can find some stock pedals. The aftermarket pedal is an option but it makes mounting the clutch master a whole lot more difficult. Not a whole lot of room in the engine compartment in front of the clutch pedal.
I'm a big fan of the 75-91 Econolines, but I hate automatics. So I have become a little obsessed with manual transmission swaps in the Econolines.