250 VS 350 Hubs

[RSchwarzli]

What is the differance between 250 and 350 front hubs. While doing research all I find is the only differance between W250 and W350 front axles is the hub assy. Well what is this assy? What does it look like, how many parts to it? Is the assy. basically anything past the end of the axle? Help! Thanks.



Robert

 

[ARhine]

the dually hub assembly has a much different wheel mounting surface. It is set out much farther so the same dished wheel you use on the rear fits the front.

 

[TKingsbury]

The hub assy is most likely just the hub with races installed. If it is a hub/rotor assy, it will have a rotor already installed on it. Like ARhine said, the difference is where the wheel flange is. It is further outboard on a 350. It is my belief that the brakes and bearings are the same between the two, just the hub is different to accomodate different wheel offset. This belief only holds true on trucks with the D60 front. D44 parts from a gasser W250 will not interchange with anything on a D60.

Travis. .

 

[RSchwarzli]

So the actual definition of the hub, is " the rim, or the part the rubber gets mounted on". Am I correct on that thought? Is there not a differance between the number of bolts between the two. There is no 350's around here so I can't look at the hub so easy, which is why I am asking. With wanting to convert the crew over to a true 1 ton front end, I am just trying to get a part list made up with all the parts I will need.

 

[TKingsbury]

So the actual definition of the hub, is " the rim, or the part the rubber gets mounted on". Am I correct on that thought? Is there not a differance between the number of bolts between the two. There is no 350's around here so I can't look at the hub so easy, which is why I am asking. With wanting to convert the crew over to a true 1 ton front end, I am just trying to get a part list made up with all the parts I will need.

Nope, it is the part that the wheel bearings go into and the wheel bolts to. The rotor is held to the hub by the wheel studs. This pretty much only applies to 4wd though nowadays as most 2wd stuff has unicast hub/rotor assys.

Travis. .

Almost forgot, both will have 8 wheel studs.

 

[ARhine]

DRW hub



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SRW hub



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[Moab4x4]

I have a 92 W350 that is not a dually. For what it is worth, I was parked next to a 91. 5 W250 this week comparing them (it is interesting what can change in 4 months).

The front hubs looked the same with Dana 60's on both trucks.

Internally?????

Ken

 

[RSchwarzli]

ARhine,

Niether of the pictures worked, not sure if that is just my computer or... .....



Moab4X4,

Theiretically speaking, they should be the same as a 250 being a SRW. Same style rims fit front and back. If any of you wanted to get a true 1ton front end what would y'all be ordering for parts?

 

[Simplysmn]

front end

i think what you are looking for is size of axle i have a dana 60 front end

1 ton but its a 4500 lb axle the difference is there is a 4500 n a 3500 lb axle

 

[TKingsbury]

All of the 1st gen diesel 4x4s had the 4500# front axle. There should be nothing different other than hubs for single wheels, or dual wheels. I posted up a while back on a thread about W350 single wheel trucks where I compared the sticker specs on my truck to the W350 single wheel truck we have at work. The only thing I recall being different was slightly higher GVW on the 350 due to higher rear axle GAWR and load range E tires. It wasn't much. Those of us with W250s got alot of truck for our money. The 4500# front axle on 4x4s was a mandatory option or spec on diesels, so we got a 1ton front diff as part of the deal. Can someone confirm the weight is the same on a W model dually? I'd just like to be sure.

Travis. .

P. S. the 3500# axle should be the Dana 44, and it was used in gassers

 

[john krmpotic]

Both 250 and 350 W models use the 4500# front axle from 1989-1993. This is a Dana 60. John

 

[RSchwarzli]

So then all I need is the rim so that I can stop carring two spares? The 350 rim will just bolt on?

 

[cerberusiam]

Is your crew cab a SRW or DRW?



The rims won't interchange between an SRW and DRW. The offsets on the rims are completely different and the wheel studs are larger (I believe).



If I understand your first post you wan to convert the crew to a true one ton and be able to use the same wheel front and rear? Right?



If you have a different wheel for the front then you probably have the 250 style hubs. You will need a hub for a one ton truck, the correct bearings for the one ton hub, maybe a rotor, and maybe a new spindle (not sure on this). Check the parts books for the correct bearings and races, they should list OD and ID numbers. You can compare them to the 250 bearing numbers to see if there are any differences.



I think that is what you were asking.

 

[ARhine]

don't know why the pics quit working... here is a link to the full writup.



http://www.pirate4x4.com/tech/billavista/60_front/index.html

 

[RSchwarzli]

Cerberusiam,



You are 100% right. That is what I want to do. When the crew was converted years ago, they used a W250 as the deisel donar and a D350 crew. So I have the 250 axles. The rear has a spacer so the drw's sit where they are supost to. My goal now is to put in a DRW Dana 80 and at the same time convert the front end from the 250 to 350 parts so I don't need two spares and so it finally looks right.

 

[cerberusiam]

Thats what I thought. I think, needs to verified, that the differences between the 350 and 250 hubs are the hub design and bearing size. I think the rotors, brakes, and spidles are the same with beefier bearings, a longer hub, and bigger wheel studs.