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Old 02-03-2010, 09:56 PM   #28 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
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Pasta - '96 Volkswagen Passat TDi
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Quote:
Originally Posted by Big Dave View Post
Unless you raid the axle off an older Cadillac Fleetwood, even 3.08s are hard to find. The aftermarket no longer supplies the 3.08 set I have.

Bigger diameter tires will hurt you mileage. Stick with the OEM size tires. Sizing tires is one thing the OEMs do well.

I have talked to hundreds of truck guys and the story is always the same.

Bigger diameter = lower MPG.
The Caddy has an 8.8 rear end?

I'm almost certain I've got the Dana 44 gearset for the 3.08's in the front, it's just down to whether or not they replaced the 8.8" rear with a 3.08. If not, there's only one more option on a truck that we have around, and that's the mountain truck, and I'd have to switch axles to keep it movable.

The other Ford we have is 2wd, and has a axle code 17, which is either 3.25 or 3.31. I think those are too far off to use against a 3.08 in 4x4 mode.
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