limited slip
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Joined: Nov 2006
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I was backing up over the curb the other day, left tire spun but right did nothing. I guess the first thing is the fluid change, which I am going to do anyhow for front, rear and transfer case. I also looked online at several products and guess I need to dig a little deeper to get a better understanding of how things work. This is my first four wheel drive so I have no experience to go by...
If the fluid change doesn't give me the results I'm looking for is installing a Detroit locker or Trutrack something best left to a shop, seeing as I have no dial indicator, etc. About the only precision measuring device I have is a digital caliper and I've never messed with gears so I don't know what to look out for.
If the fluid change doesn't give me the results I'm looking for is installing a Detroit locker or Trutrack something best left to a shop, seeing as I have no dial indicator, etc. About the only precision measuring device I have is a digital caliper and I've never messed with gears so I don't know what to look out for.
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From: Western New York
bronco521 - according to Detroit Locker's website the Truetrac will work in all SD's from 1999 and up. You could probably shoot them an email and check for sure.
thedaddycat - installing one is not difficult if you have the equipment. I don't so I had mine done at a buddies shop by a guy who has done lockers and gears tons of times. Do the fluid change first as that my solve your problems. Several people on here have had good luck just doing that. Cheap fix if it works for you.
thedaddycat - installing one is not difficult if you have the equipment. I don't so I had mine done at a buddies shop by a guy who has done lockers and gears tons of times. Do the fluid change first as that my solve your problems. Several people on here have had good luck just doing that. Cheap fix if it works for you.
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Joined: Jul 2006
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From: right here in michigan
i don't know who it was on here but they said the 05 and up 350 rears were 37spline and the others were 35.could be bad info and i haven't checked any further into it until i'm ready to put one in.
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From: Durango, CO
Originally Posted by pottymouth2
Jack up one side and try to drive off. If you can't it is an open differential.
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From: Phenix City, AL
Originally Posted by bronco521
i don't know who it was on here but they said the 05 and up 350 rears were 37spline and the others were 35.could be bad info and i haven't checked any further into it until i'm ready to put one in.
Last edited by BFR250SD; Dec 31, 2006 at 04:08 PM.
Postmaster
Joined: Jan 2005
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From: Phenix City, AL
I skipped all that......just went straight to ARB's front and rear. Loved 'em.
The only thing you need the watch on the Truetrac's is that they don't recommend them for anything bigger than 33" tires. They are a nice setup though.
The only thing you need the watch on the Truetrac's is that they don't recommend them for anything bigger than 33" tires. They are a nice setup though.
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Joined: Jul 2006
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From: right here in michigan
Originally Posted by BFR250SD
I skipped all that......just went straight to ARB's front and rear. Loved 'em.
The only thing you need the watch on the Truetrac's is that they don't recommend them for anything bigger than 33" tires. They are a nice setup though.
The only thing you need the watch on the Truetrac's is that they don't recommend them for anything bigger than 33" tires. They are a nice setup though.
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Posting Guru
Joined: Nov 2006
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Well, the fluid change is done on front and rear so we'll have to see what happens when we get some snow. I couldn't find 80W90 full synthetic for the front differential but did manage to get Mobil1 75W90 full synthetic, I doubt it will make much if any difference being 5 winter weight lower. I was suprised at how much it took to fill the differentials, 3 quarts front and almost 4 quarts rear. I even measured the drained fluid to make sure I wasn't screwing it up somehow, looked to be just a tad more than came out. I'll drive around tomorrow and then pull the fill plugs to see how much if any excess there is.
While at Advance Auto I also saw a Lucas Oil product called "Pure Synthetic" synthetic oil stabilizer. Does anyone have any experience or feedback on this stuff? Lucas seems to have a fairly decent rep from what I've read.
While at Advance Auto I also saw a Lucas Oil product called "Pure Synthetic" synthetic oil stabilizer. Does anyone have any experience or feedback on this stuff? Lucas seems to have a fairly decent rep from what I've read.
Last edited by thedaddycat; Dec 31, 2006 at 08:23 PM.
Postmaster
Joined: Jan 2005
Posts: 2,753
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From: Phenix City, AL
Originally Posted by thedaddycat
While at Advance Auto I also saw a Lucas Oil product called "Pure Synthetic" synthetic oil stabilizer. Does anyone have any experience or feedback on this stuff? Lucas seems to have a fairly decent rep from what I've read.
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Joined: Oct 2005
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with the Ford LS not hooking up just run a little brake for a couple of wheel turns than release..seems to allow the LS to hook-up.
seems to help untill you cut down on the modifiers. The 05's and up should have factory fills of synthetics which should elimenate any modifiers unless you have chatterring..
cheers
seems to help untill you cut down on the modifiers. The 05's and up should have factory fills of synthetics which should elimenate any modifiers unless you have chatterring..
cheers
Postmaster
Joined: Jan 2005
Posts: 2,753
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From: Phenix City, AL
All trucks with the LS have synthetc fluid. The friction modifier is still required,unless you are using an aftermarket fluid that already has it in it.
Brakes help, but the problem is the Ford OEM LS breaks free at a rediculously low torque load, something like 100 - 125 lb/ft. That's if it's working correctly.
Never been a fan of the clutch type "limited slips", you'd be better off calling them "limited traction"
Brakes help, but the problem is the Ford OEM LS breaks free at a rediculously low torque load, something like 100 - 125 lb/ft. That's if it's working correctly.
Never been a fan of the clutch type "limited slips", you'd be better off calling them "limited traction"
Elder User
Joined: Jul 2006
Posts: 688
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From: right here in michigan
Originally Posted by BFR250SD
All trucks with the LS have synthetc fluid. The friction modifier is still required,unless you are using an aftermarket fluid that already has it in it.
Brakes help, but the problem is the Ford OEM LS breaks free at a rediculously low torque load, something like 100 - 125 lb/ft. That's if it's working correctly.
Never been a fan of the clutch type "limited slips", you'd be better off calling them "limited traction"
Brakes help, but the problem is the Ford OEM LS breaks free at a rediculously low torque load, something like 100 - 125 lb/ft. That's if it's working correctly.
Never been a fan of the clutch type "limited slips", you'd be better off calling them "limited traction"
Postmaster
Joined: Jan 2005
Posts: 2,753
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From: Phenix City, AL
Basically, the only thing the factory LS is good for is being used on surfaces that offer remotely the same amount of traction between both wheels, i.e. wet pavement.
But,for a $300 option, you could always just put a rubber band around the spider gears and get the same effect.
Best thing to do is like stated before, change the fluid, add 2 oz at a time while doing a series of sharp turns until you just barely hear the clutch pack chattering. Just keep in mind, the Motorcraft Synthetic gear oil is about $17 a qt and you need just under 4 to refill the dif.
But,for a $300 option, you could always just put a rubber band around the spider gears and get the same effect.
Best thing to do is like stated before, change the fluid, add 2 oz at a time while doing a series of sharp turns until you just barely hear the clutch pack chattering. Just keep in mind, the Motorcraft Synthetic gear oil is about $17 a qt and you need just under 4 to refill the dif.
Thread Starter
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Senior User
Joined: Dec 2006
Posts: 166
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From: upstate central new york
does the motorcraft synthetic oil have to be used in my manual it states i think 75w145 gear oil and says nothing about any modifier sor the rear. before the cover on mine was changed it seemed ok not great but ok after the change in fluid it does not lock up as well. so i guess my question would be what fluid do you use manual spec or the forums thanks for any help