DENNIS Day - re Your Onan in a 982 and the extra vent on the crankcase. In that same general location there's supposed to be a rubber hose about 5-6 inches long that runs between your vacuum operated diaphram fuel pump and a vacuum port located on the back face of the crankcase right by the oil filter mount. Is that maybe the port you're asking about? It's a direct air inlet/outlet into the crankcase, has to have something connected to it or oil contamination will occur.
The 982's were the only CC IH used an Onan in, there was a rumor years ago that some early 1872/2072's were built with a few left-over Onan B48G's from 982's but that may not be correct. They're not a bad engine, just not cheap to keep running with parts now days or cheap to run, they seem to burn a LOT of gas. My local CC dealer laughs at me when I ask about Onan parts. Supposedly Cummins dealers can get parts but I get most of mine from Onanparts.com.
DON, GERRY, Jeremiah - ALL CC rearend/diffs were "Open" rearends, no torque biasing ability at ALL. There's a Dana rearend that can be made to fit in CC's, A 7-1/4" ring gear, not sure what number it was but an Air Locker may be available for that. Or you could always do a "Lincoln Locker" where you weld the side & pinion gears together. All things considered, a TORSEN Diff would be the best.
I've had four Traction-Loc Ford rearends, a later 9" in the '78 F150. an 8.8" in the '88 Mustang GT & "87 F150, but the best one has been the 10-1/4" in the '96 F250. After 300,000 miles it still acts like a locker in slick conditions. SON had a heavy duty 8.8" Trac-Lok in his '93 Lightning and we were in that rearend constantly it seems. Last time we gutted the axle and ALL new moving parts were installed, went from 4.10 ratio to 3.55's, Trac-Loc replaced with a Detroit Locker, all new seals, gaskets, bearings. A Ford 8.8 may be able to handle 400-500 HP in a 2800# car but it can't handle 250 HP in a 4500# truck!
The 982's were the only CC IH used an Onan in, there was a rumor years ago that some early 1872/2072's were built with a few left-over Onan B48G's from 982's but that may not be correct. They're not a bad engine, just not cheap to keep running with parts now days or cheap to run, they seem to burn a LOT of gas. My local CC dealer laughs at me when I ask about Onan parts. Supposedly Cummins dealers can get parts but I get most of mine from Onanparts.com.
DON, GERRY, Jeremiah - ALL CC rearend/diffs were "Open" rearends, no torque biasing ability at ALL. There's a Dana rearend that can be made to fit in CC's, A 7-1/4" ring gear, not sure what number it was but an Air Locker may be available for that. Or you could always do a "Lincoln Locker" where you weld the side & pinion gears together. All things considered, a TORSEN Diff would be the best.
I've had four Traction-Loc Ford rearends, a later 9" in the '78 F150. an 8.8" in the '88 Mustang GT & "87 F150, but the best one has been the 10-1/4" in the '96 F250. After 300,000 miles it still acts like a locker in slick conditions. SON had a heavy duty 8.8" Trac-Lok in his '93 Lightning and we were in that rearend constantly it seems. Last time we gutted the axle and ALL new moving parts were installed, went from 4.10 ratio to 3.55's, Trac-Loc replaced with a Detroit Locker, all new seals, gaskets, bearings. A Ford 8.8 may be able to handle 400-500 HP in a 2800# car but it can't handle 250 HP in a 4500# truck!