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Replied to your PM, I'd try that first since it's a simple service and a common residual affect with fluid breakdown. Not saying to disregard ibds posts, his posts are spot on as well.
The rear end paired with the driveshaft that is NOW in the truck is a 12 bolt S919D (9.75), driveshaft is shorter. This shaft and rear end was in the 2000 F-150.
The rear end paired with the driveshaft that WAS in the truck is a 10 bolt S869b (8.8), drive shaft is longer. This shaft and rear end was in the 97 F-150.
The engine is the Triton 4.6, this is in the 97 F-150.
I did not identify the transmission.
Originally Posted by ibd2328
The flange on the 9.75 stick out a little further
Could we swap the flanges and use the longer driveshaft?
The differential is larger and the ring gear/ pinion push the flange out further. IMO it is better and much easier to get a drive shaft from a 9.75 2wd truck. I would say 75% of 2000 and up with V8's had the 9.75, so sourcing one should not be a problem. I know of several at a local junkyard for 40 bucks, but shipping is the killer. I would look locally.
I would also do as Brew suggested, add some modifier. All of the Limited Slip differentials need it, it makes a big difference.
If you want to be safe, I drained my 9.75 out and still had some sludge left in it. So I filled it full with some diesel fuel and let the wheels spin for about 5 minutes (on jack stands) and it made the differential clean up like new. Then I added the oil and modifier.
Originally Posted by Hexxus
The rear end paired with the driveshaft that is NOW in the truck is a 12 bolt S919D (9.75), driveshaft is shorter. This shaft and rear end was in the 2000 F-150.
The rear end paired with the driveshaft that WAS in the truck is a 10 bolt S869b (8.8), drive shaft is longer. This shaft and rear end was in the 97 F-150.
The engine is the Triton 4.6, this is in the 97 F-150.
I did not identify the transmission.
Could we swap the flanges and use the longer driveshaft?
I've gone to the three large part yard around here. Either the driveshaft was gone or it was bent by the guy that picks up the vehicles with the tractor.
I will travel to the other towns around me and search for it there.
You really ought to consider just getting one made. Take the shaft you have and let a driveline shop build you one. There are 3 shops just in town here that are very very reputable. From scratch, my Buddy had one made for his XJ (he put an 8 inch lift on it) that ran him 350 dollars. That was flanges, shaft, u-joints, and balancing. Not bad, really.
EDIT: I am pretty sure this also has a slip yoke on the shaft itself too.
