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97 f150 5.4 4x4 questions

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Old 03-24-2014, 11:42 PM   #1
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Default 97 f150 5.4 4x4 questions

hi guys. got a question about my 4x4 system. my 97 f150, with a 5.4L, is my work truck. has a ford 9 inch in the back, and an ifs setup in the front, not sure what style diff it is. i do a ton of towing for work and recreational towing. recently I have noticed that my 4x4 high and low arent living up too my expectations.
my main problem is when i put it in 4x4 to go up my steep snowcovered driveway, i find halfway up if i slow down a bit when backing my trailer up, that when i give it a little more gas, one or two tires will start to spin. and i end up going nowhere.
so then ill try using 4x4 low, now i pretty positive 4x4 low works cause i can hear it engage. now once im engaged in low i put my trans back into gear and attempt to continue backing up. now when i start easing into the gas to get going. i can hear my engine rev up and not one tire moves until im over 3000rpm and at that point the tires immediately break free and spin, but not all 4 just two. usually the rear tires.
now to add some info. my tires are brand new goodyear wrangler a/t. and i do not just put the peddle to the floor and go. i do ease into it slowly.

so hers my question. what options do i have to lock my tires together so they have to move together?
posi lock diffs?
lsd?
front wheel lockers?
changing gear ratios?

thanks in advance for any help.
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Old 04-04-2014, 11:24 AM   #2
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First off, you have a 9.75 rear, not a 9". It must be a pretty heavy trailer if your revving to 3k before you move or the tires slip, unless your torque converter isn't locking up correctly. Installing a limited slip or locker in the rear end will help greatly as well as getting a higher ratio set of gears.(you have to change front and back) a LSD up front would help with traction in 4 wheel, but not necessary. Check your door sticker for the axle code. If its a letter and number, it already has a LSD rear. If a number & number, its an open diff. If it does have a factory LSD, you may just need new clutches installed in it.
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Old 07-20-2014, 10:23 PM   #3
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Thanks for your help, and sorry about the late reply
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Old 07-20-2014, 11:05 PM   #4
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Quote:
Originally Posted by 97FordBoy View Post
Thanks for your help, and sorry about the late reply
LOL. 4 months later?? What did you end up doing with it? And, your welcome.
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Old 07-28-2014, 12:14 AM   #5
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I havent done anything about it yet. I believe a huge part of my problem is the new tires i have on arent the greatest A/T tires. So im going to upgrade them.
I also went and looked, my axle code is 19, so based off what you have told me. I have an open diff. Which means im going to look into getting a lsd
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