I didn't notice until after I bought the 250, but the 350 sits higher in the rear than a 250 I assume because of stiffer springs. I prefer the way the 350 sits. Anyone know how much higher the rear of the SRW 350 sits than the 250? I would be interested in raising the rear of the 250 to look like the 350. Is the only difference between the SRW 350 and the 250 the stiffer rear springs?

 

I was under the impression that the only difference was an overload leaf on the 350 spring that didn't come into play until significant load was applied. Maybe it sits a litle higher because of the thickness of the extra leaf?

 

This is the F350 spring pack. You can see four springs:

• The highest or most bent one is to control axle wrap
• 2 and 3 are normal load bearing
• 4th or lowest is the overload.

And of course, they are all sitting on top of the block.



I don't have a picture of a F250.

 

the spring blocks are two inches higher on the 350 than the 250 I know bwcause I put the 250 ones on my 350 to lower the back for my 5th wheel. I baught the blocks from the dealer.

 

The axle blocks is the main difference when it comes to height. The F-350 uses a block that is a couple of inches taller then what is used on the F-250. It would be a fairly simple swap out that should not cost all that much...

 

The F250 has a 2" lift block, the 350 has a 4" lift block. I put the 4" lift block on my old F250 so that my truck would sit level when my 5 th wheel was on it. I ordered the lift blocks on line from a site that sells Ford OEM parts and then had an offroad shop install them.

 

anyone have part numbers for the F350 blocks?

 

Wow, did you run out and snap a pic for this thread? That's some dedication!

For what it's worth, the "most bent one" is an overload spring and has nothing to do with axle wrap. It's a third stage to the spring, whereas the F250s don't have it unless they have the camper package.

 

Tom

Good stuff

Thanks

 

Not to be a know it all or anything but just to keep the facts straight, the highest, most bent one, is the the overload spring...

 

Epic......that is the dirtest leaf springs I have ever seen..... You need to bust out that power-washer of yours!!

 

did you end up doing this mod? The part I cant figure out is when you unbolt the axle, how do you keep everything lined up? Does the axle have some type of flange that sits only in one spot? I guess I'm worried about the alignment of the driveshaft and all that after I install the spacer. Somebody give me some tips on how to install.

 

Did you get the AutoSpring spacers Lex? If so, it's no big deal.

 

No. I was just going to get the 350 OEM 4" spacer and new u bolts. What's the best way to do this? Jack up the truc by the frame just till the wheels come off the ground, then undo the u bolts and change the blocks?

 

What has worked for me in the past...

DOING one side at a time:
Is that I jack the truck up with a floor jack by the axle until I get about 6 or 8 inches under the tire. Then I support the frame with appropriate jack stands. I begin un-bolting the u-bolts and remove the nuts. Remove the u-bolts. Now begin lowing the floor jack slowly...until the F250 block can be removed. Lower another 2 inches so the F350 block will fit. Begin jacking up the axle until the F350 block is installed with some pressure. Now install the new longer F350 u-bolts with NEW nuts. Torque to specs.

Now...off to the other side...and repeat.

Really takes less than an hour...and really easy to do. Good luck!


biz