I have my dana 60 all painted and just waiting to order all the new seals and bearings and am working on cleaning up the leaf springs that came with it from the donor (88 f350) and am starting to think if this is the best option.

I know the old ttb springs are a bad ride and not lift, what can I expect from the 88 f350 springs for lift, and what other options do I have when doing a SAS. I know people talk about I think the 99+? Super duty springs but I cant remember all the details and couldn't track it down well enough to make a good comparison between options.

Thanks Again
Devin

 

I actually have a Precision metal fab 2.25" rear shackle kit designed for use with SD springs i might could sell. I have the same on my 92, but for use with the SD axle which is a pinch wider. Im also running springs from a 2003 F350 crew cab dually 4x4, which should be x-code, aka the heaviest spring. Ride is 1000000000x better than the ttb, as is handling, let alone tire wear. Front end with 31" tires is just barely shorter than a stock 91 F350 with 35" tires. Im not running a trac-bar / panhard bar, with a drop pittman arm the bump-steer is practically non-existant, but my steering box has more than a little play in it lol.

The stock F350 springs and axle should give you 1.5-2" of lift over the TTB

Stock F250 4x4




2.25" RSK with SD springs with factory F350 rear blocks (4") replaced the F250 blocks (2ish") As you can see it has almost 1/2" of rake, practically level.







.

 

the F350 springs will provide a much better ride than the F250 springs

 

Just completed my 1-ton (87f250-90f350) swap last weekend. I went from fairly bald 235s to new 265s as well and overall the truck sits 4" higher. I'll probably step on up to 285/305 soon because the 265s don't fill the wheel well.

 

265s are shorter than 235s, so i imagine they do not. Thats whats are on my second pic, 265s, couldnt beat em for $100 at the swap meet. Currently running 255s, gives the effect that i lowered the pickup 2" and the speedometer is happy again finally. I would go 285 or 315 (305s are spendy) but theyre too wide for stock wheels, and i just dont want to buy new wheels lol, unless i get some late model 18x8 factory wheels or something.

 

265/75/R16 and 235/85/R16 are *basically* the same height. 265s are wider, but otherwise are close enough to "mix and match" even when running in 4x4 without issue(I've done this).

 

If you *usually* dont mind your speedometer being off by 1-3. Depends on tire brand and how they measure really. I can tell you that the bald 235s (firestones) that came off are easily 3/4" taller than the half tread 265s (falkens) i put on. Difference in actual height between bfg 315/75/16 and toyos of the same size is all but an inch. Seems that 85 series tires are always taller than their "equivalent" height cousins. Same for 285 vs. 255 and 245 vs. 215. I just wish they made a 275/85/16

 

So I knew the 350 springs rode better, but don't the superduty springs ride even better? Is it correct that I only have 3 common spring swap options: 250, 350, or late model Superduty springs. ?

Devin

 

I'm confused, is there supposed to be a third picture here?

Devin

 

Third picture? 1st one is stock 3/4ton, 2nd one is 2.25" RSK and SD springs. Gave me 4-4.5" lift in the front, which is more than i wanted, but as little as can be had with SD springs. Maybe a little less with V code springs, which would give a softer ride, but given how mine rides, i would think too soft. Especially without a sway bar.

 

Oh did you also change the blocks at the same time?

Devin

 

Yea, sorry, bottom pic has the 4" F350 rear blocks vs. the 2.25" blocks the F250 comes with. Springs are unchanged. I think i see the source of the confusion... not sure why the writing below the pic got moved down there.

 

SD springs do not bolt in, they require a RSK designed to use them. They ride better because theyre a little longer. The biggest difference in ride / handling is from the RSK, so im told. I got the SD RSK because the SD springs came with the axle...

 

RSK is Reverse shackle kit?

I am assuming its aftermarket, not something from a Junk yard?

Devin

 

Also when people talk about inches in lift, is this from any fixed point on the body to the ground, before and after?

Is it appropriate for me to measure say to my bumper, jack up the cab from the bumper and measure to get an idea of how I like the look of my truck with different levels of lift?

Thanks Again,
Devin