Engine/Transmission (1994 - 1998) NV241HD transfer case

[SRehberg]

This probably sounds like a dumb question but I need to find out and the dealer hasn't been to cooperative.

I have a '96 3500 5spd with the NV241HD transfer case. I have a Gear Vendor's OD unit bolted to the back of the transfer case. I bought the truck used so it came this way. When they bolt on the GV unit, they remove the rear parts of the transfer case and install their adapter. My service manual has a picture of a NV241HD which shows two pieces on the rear. A rear bearing retainer and a rear extension housing. I went to find the parts to possibly put the truck back to stock and a well known local 4X4 shop had an extension but said the HD's all had one piece housings on the rear. Now I'm confused as to what is suppose to be there.



Any help would be appreciated.

 

[MPerez]

Well howdy there! I don't have an answer for you without crawling under my truck (not tonight, in the snow though) but if you are considering getting rid of the GV I might be interested in it. By the way, the air ride hitch works great! I must say thank you again for it!



Let me know what your plans are.



- Mario

 

[DWitcher]

Your local 4x4 shop dosen't know the 241HD then. The tail housing is just like your manual says.

 

[SRehberg]

MPerez, Hey, good to hear from you! Hope the hitch meets your expectations.

I'm going to try the GV unit to San Diego and if it doesn't make me feel warm and fuzzy about it, I'll get ahold of you. It works great (nothing wrong with the unit, I just don't care for it. )



DWitcher, thanks for the update, as it didn't sound right being one piece. Thanks for helping me with that.

 

[MPerez]

The ride with the air ride hitch (and my 5'ers 13,600 weight) was very, very smooth. You could really see the hitch working while driving. Actually my truck had never had as smooth a ride (when I figured out that about 70PSI in the suspension air bags was better than 40).

 

[SRehberg]

Sounds great. Until someone sees it actually doing its work, it's hard to believe what a difference it makes. Just the one trip sold me, it makes the truck smoother and glad it worked for you.

 

[jrobinson2]

Every 241DHD case I've seen has the one piece tailhousing.

You can just see the one piece housing at the top of the picture.



On edit

The early HD's definately have two piece housings



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[DWitcher]

I think SRehberg's local 4x4 shop is telling him that the tail housing does not unbolt. The one in your picture does and it is attached with 4 bolts.

 

[jrobinson2]

There are two styles of tailshaft housings, both are separate from the rear case half.

The 241DHD uses a one piece housing that holds both the seal and bearing.



I'm 99% sure the 241DLD's have a two piece tailhousing, you remove the seal housing first to get to the snap ring, then the front section that supports the output bearing unbolts from the rear case half.

I'm sure the chevy 241s have 2 piece tail housings and I'm quite sure the DLDs are the same.



I could be wrong on the DLD but thats what I remember.



On edit

As edited earlier:

The early tailhousings are two piece, see Reb's post below for better information.

 

[SRehberg]

Now I'm confused. The picture looks like the rear bearing retainer only(?) or is the bearing retainer and seal both in this housing? The service manual shows two pieces for the 241HD, but what I'm reading here, it's one piece?



Thanks

 

[jrobinson2]

or is the bearing retainer and seal both in this housing? The service manual shows two pieces for the 241HD, but what I'm reading here, it's one piece?

Thanks

Yes one piece, the bearing and seal are in the same piece.

If yours has a PTO port its a DHD, it had a one piece extension housing.

No PTO means DLD and a two piece extension housing.

 

[SRehberg]

It does have a PTO port, so that means it has a one piece housing... thank you for the clarification. It must be the DHD. Thanks

 

[jrobinson2]

It looks like I know less than I thought :{

I just worked on a '96 3500 with a 241HD and a two piece tailhousing

Sorry

 

[Reb.B]

94-96 241DHD has two piece and a PTO cover. 97-02 214 DHD has one piece tail and a PTO. All 94-02 DLD have two piece and no PTO. I believe the 97 and above DHD has the larger output shaft and the older DHD has a the same size shaft as the DLD but an inch longer and bigger internals and a different assembly inside.

 

[Reb.B]

SRehberg, ... you have a two piece DHD with the lighter duty output shaft

 

[SRehberg]

I'm as confused as hell now. I just ordered a used one piece housing from a 4X4 shop as I believed the housing was one piece from the posts. Now it looks like I'll possibly have a paper weight if mine is in fact a two piece. Is there a measurement from the chain case back that would define the issue? i. e. if the one I have is a two piece, the shaft would be longer than the one piece unit?



I appreciate the help, I just need to get this defined.



Thanks

 

[jrobinson2]

As reb said above, the driveshaft yoke and output shaft are different sizes.

I just measured the seal surface on the driveshaft yoke of two trucks with 241HD, a '99 2500 and the '96 3500.



The one piece has a 2. 19 OD on the seal surface of the driveshaft yoke.

The two piece has a 1. 88 OD on the seal surface of the driveshaft yoke.



"ASSUMING" the gearvendors used the factory driveshaft yokes you could measure the yoke diameters.



Sorry for the bum steer earlier

 

[SRehberg]

jRobinson2, no problem here, I just appreciate everyones help. I can't measure the GV OD seal as it wouldn't help, they don't use the stock yoke. They use a Spicer 1350 yoke for all the GV's I believe. I'd have to pull the unit to get to the shaft.



Thanks for the information on the seals.