10.25 SRW rear axle swap. Input appreciated.

[GOOSE]

OK, here's my deal. I currently have a 1991 F350 SRW. The drum brakes are shot. I bought a 1999 F350 cab and chassis for a parts truck and both have 4:10 limited slip axles. I really want to swap in the 10.5 to get rear discs with an E brake. I know the spring perches will need to be moved, that's a minor concern.

The biggest challenge seems to be the axle flange spacing, about 71" on the C&C, 67" on the SRW. I'm thinking 2.5" spacers that convert your pattern from 8 on 170 to 8 on 6.5. Anybody have the actual flange to flange spacing on either axle? I'm only estimating. I'm thinking about taking the C&C spring pack as well, they look beefy! Any input is appreciated.

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[IDIoit]

the only thing i can tell you with my experience is....
I HATE LUG STUD ADAPTERS.

i refuse to use them.

 

[GOOSE]

Doesn't factory duallies use spacers on the front? They seem to be reliable.......

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[79jasper]

Lol so did chevy for a very long time.
So you're wanting to just use it as a SRW right?

Found these on the net. Supposed to be for the 10.25
SRW 65.5'' wms-wms
C&C DRW 65.5'' wms-wms
DRW 72.5'' wms-wms


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[junk]

So the new axle would mount the wheels out wider? Seems like a winner to me. The factory tucks the rear wheels under there pretty good. A good set of adapters will cost you a couple bucks. And put the wheels out even further. Not sure I'd want the added width from the adapters or even want adapters.

I would probably try to find wheels for the rest similar to the front and run mismatched patterns.

 

[typ4]

You do know SD single wheels are backset a lot.

 

[junk]

99-2004 I thought have similar backset to our trucks.

2005-up have a lot of back set I believe.

 

[snicklas]

Here is an 03 Factory 16" rim on a SRW Excursion..... maybe this will help a bit.....

Looking down the Passenger Side:

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Looking down from above, sorry about it being sideways:

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Looking straight on:

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Looking from the rear with the center cap removed, the camera is placed against the sidewall so you can get an idea of positioning:

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05+, the rims is almost "flat" against the outside of the rim..... much like the rims on the Crown Vic's....