It's been a very long road for my 81 restomod. I've started and stopped several times, my wife had our 3rd child, my mom and dad in and out of the hospital....yeah, yeah, yeah. It's been 4 years since I brought the 40 home and now Ive stumbled on yet another set back.
Many moons ago I took the rear diff cover off to find a welded pinion pin. https://forum.ih8mud.com/40-55-series-tech/200626-welded-pinion-nut.html
I ended up buying a 3.71 FJ60 rear third from a fellow mudder. I believe it was an 84 and swapped them into the housing to set there for the next 3 years. I was told the driveshaft flange should be identical to my 1981 FJ40 but if not I could drill holes in the FJ60's round driveshaft flange (plenty of room).
I also recall having a time removing the rear driveshaft and thinking it was too short. Had to loosen the u-bolts to remove the driveshaft.
So the last 2 weekends I put all new rear brake shoes, wheel cylinders, rear bearings, rubber seals, etc.
I thought I would break out the rear driveshaft to see how it fits. I got it to fit, but the flange is completely different. In fact I measured the bolt holes and it matches the flange for a 8/69 to 1/74 (thanks to Cruiseroutfitters.com). Bolt holes are 10 mm on the diff side and 11 mm on the Transfer Case side.
BTW which end of the driveshaft connects to the TC and which end connects to rear diff? Seen it both ways.
Now Im wondering if my front third is 3.71 or 4.11??? How can I tell without tearing it apart?
Is it possible to frankenstein an early model driveshaft and a late model driveshaft?
Experts please chime in.
Many moons ago I took the rear diff cover off to find a welded pinion pin. https://forum.ih8mud.com/40-55-series-tech/200626-welded-pinion-nut.html
I ended up buying a 3.71 FJ60 rear third from a fellow mudder. I believe it was an 84 and swapped them into the housing to set there for the next 3 years. I was told the driveshaft flange should be identical to my 1981 FJ40 but if not I could drill holes in the FJ60's round driveshaft flange (plenty of room).
I also recall having a time removing the rear driveshaft and thinking it was too short. Had to loosen the u-bolts to remove the driveshaft.
So the last 2 weekends I put all new rear brake shoes, wheel cylinders, rear bearings, rubber seals, etc.
I thought I would break out the rear driveshaft to see how it fits. I got it to fit, but the flange is completely different. In fact I measured the bolt holes and it matches the flange for a 8/69 to 1/74 (thanks to Cruiseroutfitters.com). Bolt holes are 10 mm on the diff side and 11 mm on the Transfer Case side.
BTW which end of the driveshaft connects to the TC and which end connects to rear diff? Seen it both ways.
Now Im wondering if my front third is 3.71 or 4.11??? How can I tell without tearing it apart?
Is it possible to frankenstein an early model driveshaft and a late model driveshaft?
Experts please chime in.