rear end fluid
Fleet Mechanic
Joined: Nov 2004
Posts: 1,857
Likes: 5
From: Northern CA
75W-140 SYNTHETIC gear lube. Depending on what you go with you may also need some friction modifier also. Ford has that. A 4 oz bottle is 4-5 bucks.
I used mobil one, and so far haven't had to add any modifier.
I used mobil one, and so far haven't had to add any modifier.
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New User
Joined: Mar 2008
Posts: 13
Likes: 0
were do you get it
thanks and now the question is were do you get all that stuff and why do i have to add a friction modifier? will it hert if i just put in the royal perple straght. sorry for the stupid question.
and thankx for your guys help
and thankx for your guys help
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 5
From: Albuquerque
If you go with Royal Purple...this gear oil does not require any other additives for a Limited Slip diff...or open diff. Just add the gear oil...and you are covered either way.
I purchase my Royal Purple products on eBay usually...because cost is less. However they carry it now at NAPA, Pep Boys, etc.
Hope this helps...Good luck...
biz
Postmaster
Joined: Apr 2005
Posts: 2,759
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From: round rock, tx
just ask your fellow IL FTE club members for some assistance
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Joined: Apr 2008
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you can use Amsoil Synthetic gear lube they have several viscosity gear lubes.If you go to lubedealer.com/tomsoilandfilters/ you can click on the product application button and it will suggest what viscosity to use for your vehicle,then click on the online store button and order what you need and it will be shipped to your home.
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New User
Joined: Mar 2008
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rearend lube
thankx for all your help guys, i just went out and bought mobil1 and friction midafirer. now the only question i have is someone told me to take the rear end out and soke the clutches in this friction midafire. what do i do here? i have no idea how to take the rear end out? is it hard to do or am i just wasting my time? please help.
Senior User
Joined: Jan 2004
Posts: 294
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From: Michigan
thankx for all your help guys, i just went out and bought mobil1 and friction midafirer. now the only question i have is someone told me to take the rear end out and soke the clutches in this friction midafire. what do i do here? i have no idea how to take the rear end out? is it hard to do or am i just wasting my time? please help.
Senior User
Joined: Dec 2006
Posts: 366
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From: Rhode Island
1. Take your diff cover off and drain fluid.
2. Clean all old gasket material from the cover and axle. Be careful to keep gears free of contamination
3. Apply new RTV silicone to cover and put cover on. Don't use too much RTV as it can make a silicone worm that can come off in your diff and do damage.
4. Let the RTV set for awhile then fill your diff with the proper 75w140 synthetic oil.
5. If using Royal Purple or Amsoil you may not need the friction modifier as this oil contains modifier already.
6. If you use an oil that requires adding the modifier, add half the required dose and take the truck for a ride. Do some figure eights in a parking lot and see if the axle chatters. If the axle chatters add a little more modifier and do figure eights. Repeat process until axle no longer chatters. You don't want to add more modifier than needed because it can reduce the effectiveness of the LSD.
2. Clean all old gasket material from the cover and axle. Be careful to keep gears free of contamination
3. Apply new RTV silicone to cover and put cover on. Don't use too much RTV as it can make a silicone worm that can come off in your diff and do damage.
4. Let the RTV set for awhile then fill your diff with the proper 75w140 synthetic oil.
5. If using Royal Purple or Amsoil you may not need the friction modifier as this oil contains modifier already.
6. If you use an oil that requires adding the modifier, add half the required dose and take the truck for a ride. Do some figure eights in a parking lot and see if the axle chatters. If the axle chatters add a little more modifier and do figure eights. Repeat process until axle no longer chatters. You don't want to add more modifier than needed because it can reduce the effectiveness of the LSD.