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when you change the rear end gears do you have to change the front

YES! You musr change them both!! The only way to NOT do that is to take the front driveshaft out and put it away until the front gears can be installed..
The rear going 10 miles an hour and the front going 12 miles an hour will get you in BIG TROUBLE in the first 3 feet after engaging the 4X4!
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist