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post #1 of 15 (permalink) Old 11-29-2007, 05:18 AM Thread Starter
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Diff fluid

It says use 75w140 for the rear....Does the royal purple have the limited slip additive in it ?....And the front is 75w90....Can you put the same weight (75w140) in both or should I just use the 75w90 for the front ?

And how do i tell if I have LS....When I first go the truck it would do 2 wheel stand stills....Now its a peg legger

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post #2 of 15 (permalink) Old 11-29-2007, 07:35 AM
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Re: Diff fluid

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Originally Posted by Dieselboy View Post
It says use 75w140 for the rear....Does the royal purple have the limited slip additive in it ?....And the front is 75w90....Can you put the same weight (75w140) in both or should I just use the 75w90 for the front ?

And how do i tell if I have LS....When I first go the truck it would do 2 wheel stand stills....Now its a peg legger
You dont need any additives with the royal purple, Use the recamended weight at both ends. There should be a tag on the diff cover that should tell you if its an ls or not.

06 F350 CC LB 4x4 with a few odds and ends
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post #3 of 15 (permalink) Old 11-29-2007, 04:09 PM Thread Starter
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Re: Diff fluid

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You dont need any additives with the royal purple, Use the recamended weight at both ends. There should be a tag on the diff cover that should tell you if its an ls or not.
What does the tag say....I think mine says 3L73 so the L is the Limited slip.....either way i think i fried the thing....Like i said when i first got it i did a brake stand and had 2 strips...Now Its only one....

Race truck
2002 F-350XL RC/LB
NADP Race Trans/PCS'd
Lowered w/ traction bars
33" Nittos on 20" Fuel Hostages
Unlimited 450/400s
S475 on Irates mount
TE 17* with Gen3
DI Headers
Dieselboy fuel system
[email protected]
599.3 on BDs dyno

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post #4 of 15 (permalink) Old 11-29-2007, 04:53 PM
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Re: Diff fluid

Just go with the Royal Purple & the correct weight for your truck. It'll be just fine. Go find a dirt road & brake torque your truck then take off & see if there are 1 or 2 ruts. Mine is a limited slip so I'll see the right side digs first then the left side kicks in & presto....2wd!


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post #5 of 15 (permalink) Old 11-29-2007, 05:36 PM
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Re: Diff fluid

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Originally Posted by Dieselboy View Post
What does the tag say....I think mine says 3L73 so the L is the Limited slip.....either way i think i fried the thing....Like i said when i first got it i did a brake stand and had 2 strips...Now Its only one....
Yup the L is for limited slip but the stock ones are junk the RP may help some it did with mine.

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post #6 of 15 (permalink) Old 11-29-2007, 05:55 PM
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Re: Diff fluid

I thought I had an open diff until I changed to the royal purple. It made a huge improvement. I also switched to the 08 diff cover it looks alot cooler than the rusty stocker. And I can do two wheel peels all day long now.
Billy

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post #7 of 15 (permalink) Old 11-29-2007, 06:35 PM Thread Starter
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Re: Diff fluid

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I thought I had an open diff until I changed to the royal purple. It made a huge improvement. I also switched to the 08 diff cover it looks alot cooler than the rusty stocker. And I can do two wheel peels all day long now.
Billy
Im gonna get a Mag Hytec....I dont like the 08....looks to much like the nissan one

Race truck
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NADP Race Trans/PCS'd
Lowered w/ traction bars
33" Nittos on 20" Fuel Hostages
Unlimited 450/400s
S475 on Irates mount
TE 17* with Gen3
DI Headers
Dieselboy fuel system
[email protected]
599.3 on BDs dyno

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post #8 of 15 (permalink) Old 11-29-2007, 09:00 PM
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Re: Diff fluid

Quote:
Originally Posted by fbilly420 View Post
I thought I had an open diff until I changed to the royal purple. It made a huge improvement. I also switched to the 08 diff cover it looks alot cooler than the rusty stocker. And I can do two wheel peels all day long now.
Billy
So switching to RP really helps the LS lock up better? Might be worth it to do that to mine then.


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And remember, he's cat rebel....he doesn't do it the normal way.
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post #9 of 15 (permalink) Old 12-01-2007, 07:20 PM
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Re: Diff fluid

Do what I did to my 08 cover. It took some time but way cheaper than a mag.

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93 F350 Gasser
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post #10 of 15 (permalink) Old 12-01-2007, 11:20 PM
 
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Re: Diff fluid

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Originally Posted by Cat_Rebel View Post
So switching to RP really helps the LS lock up better? Might be worth it to do that to mine then.

Probably not the fluid itself, but the amount (or lack of) LS additive already in the fluid.
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