Yes, for 2017 the 250, no matter how it's optioned i.e. HD, will still have softer springs than a SRW 350. That doesn't in any way mean that those springs are limited to 6340# though.

 

while we are chatting about the M275, has anyone found the manufacturers gross weight rating for this axle. I am not talking about what Ford rates it for in our trucks, but what the axle is designed for from Dana.

 

There is nothing anywhere on the net or Dana's website about either the M275 or it's big brother M300 that I've seen other than a limited press release from a couple years back.

 

Yep, thats what I was finding to, I fired off an email to Dana through my company to see if I can get any info.

 

I was just trying to answer the OP's fundamental question. Based on the published specs and Ford's rating methodology, his rear axle assembly springs are the "weak link in the chain".



Based on what I've learned here in the past two months, I wouldn't be at all surprised if the some of the numbers and specs are more like "guidelines", to paraphrase Captain Barbossa in Pirates of the Caribbean.


Jim / crewzer

 

I got ya Jim. To be honest, I'm never sure if someone wants the physical deal or the legal deal.

 

Jim / crewzer

 

I tried the same thing...didn't hear a peep. That was weeks ago. Guess they only care about you if you want to buy a bunch of axles from them.

 

I can verify the spring packs are different. My brother and I both have 17 powerstrokes. I have a f350 and my brother has the f250. We parked them next to each other and looked for the differences. One thing right away was the overloads, but the spring pack itself is different beyond the overloads. The 250 has a 2 leaf pack where the 350 has 3 leafs. Both trucks are crew cabs but the 250 is a shortbed.

 

I think the second 250 in that spring spec list is supposed to be a base f350. If you look at the foot note it specifies for an f350.

What I find interesting is the spring spec for the base 250 with 3 leaves is rated at #2781 is the same as an f250 with hd pack with 4 leaves and the base f350 with 4 leaves.

I think karl4cat found that the sterling axle is rated somewhere around 9500lbs.

 

The Dana 60 up front now has the huge 1550 series u-joints standard across all badges, as well as the 10'' ring gear. The only difference now between these axles and the 450-550 'Super 60' axles are the 'smaller' knuckles and 3/8'' (compared to 1/2") thick tubes.

I was quite surprised when I crawled under a new 250 and measured a full 5'' across the u-joint, compared to a little over 4'' on my 2006 250.

Anyone that has a '17 250 or 350 if you want check to see if you have these large 1550 joints to confirm my findings.

 

Appreciate this thread which is providing information I have been trying to get for months but unable to get from any of my local dealerships. This is kind of important information to know about in deciding which truck to get.

It sounds like your F250 did not come with the Camper Package (?)

Just summarizing my understanding based on the leaf spring chart Troverman posted (post #15 - Thanks for that!) an F350 comes with at least one additional leaf spring, 5, vs. a camper package equiped F250, with a maximum available 4 leaf springs. The leaf springs on the F350 are beafier than those on the F250 regardless of configuration.

Based on what I have read here it is not possible to get the Dana in either the F250 or F350 with the 6.2 engine, correct ?

Also I am wondering what influence the G transmission has if any other than the differnece in weight. It is only available on the F250. The G transmission sounds like it does all the right things - lighter, improves fuel efficiency and torque, is tuned for the 6.2 engine and yet is not available on the F350. So why isn't it offered on the F350 unless the higher payload of the F350 would exceed the G transimission's capabillities. I was told by Ford that the 6 speed transmission that comes on the F350 has the option to order it with "Power Takeoff".

 

Appreciate this thread which is providing information I have been trying to get for months but unable to get from any of my local dealerships.

It sounds like your F250 did not come with the Camper Package (?)

Just summarizing my understanding based on the leaf spring chart Troverman posted (post #15 - Thanks for that!) an F350 comes with at least one additional leaf spring, 5, vs. a camper package equipped F250, with a maximum available 4 leaf springs. The leaf springs on the F350 are beefier than those on the F250 regardless of configuration.

Based on what I have read here it is not possible to get the Dana in either the F250 or F350 with the 6.2 engine, correct ?

Also I am wondering what influence the G transmission has if any other than the difference in weight. It is only available on the F250. The G transmission sounds like it does all the right things - lighter, improves fuel efficiency and torque, is tuned for the 6.2 engine and yet is not available on the F350. So why isn't it offered on the F350 unless the higher payload of the F350 would exceed the G transmission's capabilities. I was told by Ford that the 6 speed transmission that comes on the F350 has the option to order it with "Power Takeoff".

 

DANA is indeed 6.7 only in both the HD250 and SRW 350.

 

Has anyone found the Dana specs for the rear axles yet?