Join Date: Aug 2012
Location: Fulltime RVer
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Has Anyone Swapped the 4.30 Rear End for the 3.73 in an F-450?
I was going to post this in the "Powertrain Problems" area... but it really isn't a problem, per se.
I was just wondering if it was possible... and if so, how difficult it would be... to remove the 4.30 rear end from my F-450, and replace it with the 3.73 rear end that is used in the F-350 DRW trucks?
Since I tow a 5th wheel toy hauler RV, and often visit campgrounds where I have to back the rig into the site... I opted for the F-450 because of the wider front-end geometry and the resulting better turning radius. But, of course, the F-450 is only offered with the 4.30 rear end.
Even if I fully load my rig, it'd only weigh no more than 18,000 lbs, and for that, I don't think I need the 4.30... especially when the 3.55 rear end in my old F-250 pulled 15,000 lbs. just fine.
Since the F-350 DRW models are offered with the 3.73 rear, I'm thinking it shouldn't be that difficult. Just a simple swap and the reprogramming of the computer... but, of course, that's just a guess.
I love everything about my truck, except for that 4.30 rear. It's killing me in gas mileage. I just pulled an EMPTY 8x16 enclosed trailer that weighs about 3000 lbs. from NC to MS yesterday... and only got 10 mpg with the cruise control set right at the 70 mph speed limit for well over 80% of the trip. It's obviously much worse when pulling my RV... somewhere in the 7-to-8 mpg range.
Considering I plan on pulling the RV around 20,000 miles per year... getting 1 or 2 more mpg by installing the 3.73 rear would probably pay off in the long run.
Knowing that I can't be the only person who's ever thought of this, I was just wondering... has anyone already done this, and can give me an idea of what to expect?
2014 F-450 PLATINUM
2014 Dutchmen Voltage 3200 5th Wheel Toy Hauler