Rear axle - Ford Powerstroke Diesel Forum
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Old 11-26-2012, 05:05 PM
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Rear axle

Hey guys,
I searched but couldn't find an answer.
How hard would it be to change the gears in the rear of the 350 to 3.55 or 3.73? Is this a whole axle swap with a 250 or just the gears inside the axle? Would a swap with a 250 be a bad idea? I want the mileage that they offer.
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Old 11-27-2012, 12:11 AM
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Depends, do you have a clam shell bearing puller, extra shims, gear paint and a shop press? If so then it should take about 6 - 48 hours per axle depending on how experienced you are in gear setup. I would just swap the whole axle, takes about a hour but you will need new ubolts.
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Old 11-27-2012, 04:59 AM
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Axle swap it is then! Anything else I will need to know? I think I saw a write up on here somewhere.....
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Old 11-27-2012, 03:44 PM
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what gears are you running now 4.10's?
i dont think that you would see a big increase in mileage swapping them.
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Old 11-27-2012, 08:06 PM
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My goal is to get high teens or low twenties in mpg. Big tires with 3.73 might do it if I'm careful but 3.55 would be ideal. Looks like I'd have to swap with a dodge Dana 80.
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