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[Quote ]John Does the PTO shaft have to be removed to do a rear split? That is why I questioned about replacing the internal seal. Does the 671 and 871 hydraulic pump manifolds interchange? Does the manifold have O rings like the NAA or are they gaskets? Is there a kit available that has the gaskets and O rings for a rear split? Thanks again Bob [Quote] Doing a "rear split" means the engine and transmission stay attached and the differential housing to transmission are broken apart. The entire PTO shaft assembly is completely inside the differential housing. The coupler between the transmission and PTO is the only thing you will have to diddle with. The lift cover is on the top of the differential housing. So, if you are swapping differential housings complete with lift cover and including the PTO assembly there is no reason to mess with either of them. Between the transmission and differential housing there are 3 things. 1 is a large gasket that costs a couple bucks. The other 2 are O-rings that go around the hydraulic fluid transfer tubes at the bottom right corner of the assemblies. Those are like a buck each, tops. Since you have to get the gasket at your local Ford NH dealer, may as well get the o-rings there too. You may want to get a round PTO access cover gasket in case you need to reach in there and help align the PTO shaft to coupler. Couple bucks also at FNH dealer. The hydraulic pump and manifold don't have to be touched to do a rear split as they are on the engine and front of the transmission.
Rear splits are fast and easy. Just block up the back of the transmission and wedge the engine so it can't flop. Put a rolling jack under the differential housing, unbolt and roll the back away. Roll the new back end (with the new gasket on it) up to the transmission. Put on 2 new o-rings and mate them up. Add bolts, hydraulic fluid and your done. Hard part is aligning the housings and the 2 couplers for wheel power and PTO. Accessing thru the round cover on the side of the differential housing helps a bunch. Also, if you suspend the new differential housing off the ground with an engine hoist that makes life easy. Otherwise the pinion will be rotating as you move them together and that can make alignment "fun". Just go slow, be cautious and never force anything. When the stars align, the parts will slide together slicker than deer guts on a door knob. Just make sure the couplers can slide onto the shafts of the new back end BEFORE you attempt to align....
jb
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