NP241 flange nut on the driveshaft yoke

[The War Wagon]

Why, oh WHY, does the Haynes Manual on '74 - '93 Full-Size Dodge Trucks, NOT include a diagram of the NP241 transfer case?!?! 


Oh well - some buddies from Steeltown Offroaders are gonna speed up my driveshaft project - we just need to know a couple of things.




1) What SIZE is the flange nut that attaches the yoke to the transfer case?  Is it standard, or metric?

2) What's the proper inch/lbs of torque to cinch my new flange replacement back onto the t-case?  After the meeting, we were kicking tires in the parking lot, and guessing 150-180 in./lbs, but we'd prefer NOT to "guess" - we'd like to get it RIGHT.

3) Does the pinion seal need to/HAVE TO be replaced at this time, since the yoke is coming off?  Is that an "Autoshack" purchase, or a special order item?



Thanks guys!

[ProjectPW]

yep get a new seal... dont rely on the parts house to know which one it is....write down the number off of it and call around....have an assortment of metric and standard sockets on hand and get a good impact to remove and install the yoke....it needs to be tight ...if you dont feel comfortable without a torque wrench use the torque spec for a np208 it will be the same/close enough

[The War Wagon]

Thanks - I'll order that seal today!


We've got an inch/pound wrench lined up, so we're good in that sense.  I'll keep you posted.

[The War Wagon]

Pinion seal update:


Denny's has this, and because it's Denny's, I KNOW it'll be RIGHT: http://www.dennysdriveshaft.com/p890_np_241_1988_2002_rear_output_seal_for_dodge.html


Whilst Autozone has this: http://www.autozone.com/autozone/parts/Duralast-Transfer-Case-Seal/_/N-6o2sg?itemIdentifier=513024&_requestid=901817


Autozone is a mile away from me, which is the great temptation - it's easy to get to.  We're pulling the driveshaft & yoke next week (where's that 'fingers crossed' smiley, anyways?  ), so I wanna make sure we have the RIGHT seal in hand and are GTG!


What sayest the brain trust?

[ProjectPW]

is autozone really the only local choice..... seriously?..... I would look elsewhere .....

[ProjectPW]

the seal you need is National p/n:3946 ...... now go find an oreilly or napa or something....no ZONE 

[The War Wagon]

Sometimes, after typing something out, you SEE that you'd already answered your OWN question in the process.





I ordered from Denny's Driveshaft right AFTER I posted that. 

[The War Wagon]

the seal you need is National p/n:3946 ...... now go find an oreilly or napa or something....no ZONE 

No lie.  I basically use them to get motor oil, car wax, shop rags - things that even they can't screw up. 

[SixGun]

Just like most places, branding makes a big difference.  Also helps to know what part number you need.  The Duralast line is terrible and I used to work for AZ. Felpro gaskets and Timken seals no problem there.  I like to check Advance online. Usually run a discount to buy online and pick up at the store. I've found some better quality parts there. Chemicals usually have a 2for special for stuff like brake cleaner. Seems like anytime i try to get anything from NAPA they have to order it and it takes a week. So i usually go with O'Reilly. Great service and prices. The one by my house usually has to order it but it is same day or next.