axle swap
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5th Wheeling
Joined: Oct 2010
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both of those numbers came from the top line on the tags bolted to the rear cover. the numbers on the bottom line indicate gear ratio / limited slip / and date of manufacture from what i understand. is there a different model number i should be using for interchange? the truck in question is 1999 rwd with auto and 7.3 diesel. thanks
Fleet Mechanic
Joined: Aug 2011
Posts: 1,570
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99-04 f250/f350 and 99-05 excursion 2wd/4x4 rear axles will work, early 99 trucks had one brake calliper flipped but doesn’t matter for a swap.
The axle code on the door jam will be what you want to compare if you want the same axle or one with a different gear ratio or limited slip, an axle code with two numbers in it will be an open diff, one number and a letter will be limited slip, the number crosses over to what gear ratio it is.
05-10 will bolt in and have bigger brakes but require bigger rims (17” minimum), different offset rims so they don’t stick out 1-1/2” on each side, abs sensor on the diff needs to be swapped to the older 04-earlier sensor and the e-brake lever will need to be changed to accept the older e-brake cables.
The axle code on the door jam will be what you want to compare if you want the same axle or one with a different gear ratio or limited slip, an axle code with two numbers in it will be an open diff, one number and a letter will be limited slip, the number crosses over to what gear ratio it is.
05-10 will bolt in and have bigger brakes but require bigger rims (17” minimum), different offset rims so they don’t stick out 1-1/2” on each side, abs sensor on the diff needs to be swapped to the older 04-earlier sensor and the e-brake lever will need to be changed to accept the older e-brake cables.
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Twistedtesty
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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May 24, 2010 09:58 PM
