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One of the folks over in the Super Duty forum sent me this way...
I have a 2003 F350 Super Duty Crewcab 4x4 with a 3.73 gear ratio. (6.8L V10), Automatic Transmission, stock (31") tires. Would like to change it to 4.30 or 4.56 gear ratio for purposes of towing/ease of towing a trailer in the 9000# range. Mine since it was new, so know no other work has been done on it.
Does great right now, mostly, but the 3.73 bogs the engine a bit to much for my liking hill climbing/descending. Truck still at less than 30,000 miles. And U-joint may be giving me some excess noise when it drops into gear.
BUT, who/where to get the work done? And a ball park figure?
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Thanks! Got another estimate today at $925 an axle. Beginning to wonder if the $650.00 an axle was TOOO good. Like, maybe they didn't have the install kits included or something. Will Check out SuperDuty HQ next. Could be a labor rate difference also.
SgtDan, I had AZ Diff Specialists do my truck about 3 years ago. They did a good job for me. At that time, if I remember right, they charged me about $1150 for both axles on my 99. Their price at $650 per axle would sound about right for them doing the job.
Check to see what kind of gears the more expensive places are using. If their using more expensive gears because they are stronger, it might be worth the difference.
I had 4:11 gears put in mine. I pulled a 24' Haulmark(AKA heavy SOB) enclosed trailer that was loaded pretty heavy over 4,000 miles that summer after the gears were installed. With the 4:11 gears, I could pull any hill at a minimum of 65mph, even over the continental divide. The only thing that would slow it done was the egt's would get too high and I would have to back out of the throttle.
I mentioned this because I think you might be making a mistake with the 4:30 gears unless you are putting super tall tires on it. Mine measure at 33".
I hope that this helps.
63 F100 Short Bed Custom
29 Ford Sedan Delivery
99 F250 SD, CC, Diesel, 4x4
95 F350 Dually Flatbed Diesel
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