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Old 10-03-2013, 10:06 AM   #1
SteveV
 
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Royal Purple Gear Oil

A number of you have said that in addition to putting Royal Purple Synchromax in your Tremac, you also replaced the gear oil in the rear axle with Royal Purple as well.

What weight did you use? I have seen 75 - 90, 80 - 90, 75 - 140 and 85 - 140.

Thanks in Advance...
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Old 10-03-2013, 10:16 AM   #2
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I used the 75W-90 Royal Purple Max Gear. Works great and it's the recommended gear oil weight for the rear differential.
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Old 10-03-2013, 10:24 AM   #3
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My '10 SS started making noises immediately after I changed my diff gear oil to 75W/90 Royal Purple. I later went back to my old stand-by, Mobil1, and the noises ceased. I was later informed that, contrary to Royal Purple's claim, a friction modifier needed adding when using their product (?)
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Old 10-03-2013, 12:12 PM   #4
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Quote:
Originally Posted by Deebo View Post
My '10 SS started making noises immediately after I changed my diff gear oil to 75W/90 Royal Purple. I later went back to my old stand-by, Mobil1, and the noises ceased. I was later informed that, contrary to Royal Purple's claim, a friction modifier needed adding when using their product (?)
That is good to know. Thanks.
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Old 10-03-2013, 01:42 PM   #5
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Quote:
Originally Posted by Deebo View Post
My '10 SS started making noises immediately after I changed my diff gear oil to 75W/90 Royal Purple. I later went back to my old stand-by, Mobil1, and the noises ceased. I was later informed that, contrary to Royal Purple's claim, a friction modifier needed adding when using their product (?)
//Update: see post #9.// Thats interesting, I just changed my diff oil to 75/90 RP and haven't heard any noise. I didn't add any additional friction modifier either. I suppose each car is different.
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Last edited by White_SS/RS; 12-01-2013 at 01:16 PM. Reason: update: see post #9
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Old 10-03-2013, 03:33 PM   #6
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The syncromax has limited slip in it. I've had no problems with it
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Old 10-03-2013, 04:09 PM   #7
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Wait, I thought the tranny fluid was called synchromax. The rear gear oil is called Max-Gear...
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Old 10-03-2013, 06:13 PM   #8
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Thats correct .....stevev
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Old 12-01-2013, 01:13 PM   #9
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Quote:
Originally Posted by Deebo View Post
My '10 SS started making noises immediately after I changed my diff gear oil to 75W/90 Royal Purple. I later went back to my old stand-by, Mobil1, and the noises ceased. I was later informed that, contrary to Royal Purple's claim, a friction modifier needed adding when using their product (?)
Quote:
Originally Posted by White_SS/RS View Post
Thats interesting, I just changed my diff oil to 75/90 RP and haven't heard any noise. I didn't add any additional friction modifier either. I suppose each car is different.
Update: At first I wasnt having any noise with the royal purple, for about 200 miles or so, and I dont hear anything when driving around but I am getting a pop from the diff when I back out of my driveway, does it almost every time I leave. I figured I'd add more friction modifier to the diff (3oz, which is half what the bottle recomended)... still does it..... I'll try adding more and see if it helps, but sounds like I'll be switching brands.
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Old 12-01-2013, 04:49 PM   #10
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I replaced all 3 of my primary drive fluids with RP Friday, 11/29:
- Max Gear 75w90 in the diff (didn't need to add any additive)
- Synchromax in the tranny
- Royal Purple 5w30 in the Engine.

The shifting has smoothed out quite a bit. No noise out of the diff.

Put 150 miles on her this weekend after doing the fluids on Friday. Running great.
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Old 12-02-2013, 09:29 AM   #11
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Steve,
A related question: my trans makes noise when the clutch is engaged and in neutral. Not when cold, always once warm though. Did yours have that noise? If so, did the RP eliminate it?
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Old 12-02-2013, 09:07 PM   #12
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Unfortunately, No. My tranny never made any noise with the clutch in.

Before the Synchromax, it was a little clunky in the 1-2 shift. That is gone now.
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Old 12-03-2013, 12:06 PM   #13
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Thx Steve
I'll give it a try anyways at the next fluid change
I misspoke earlier, by clutch engaged I meant "foot off of the pedal"
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Old 12-03-2013, 01:19 PM   #14
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Quote:
Originally Posted by h018871 View Post
Thx Steve
I'll give it a try anyways at the next fluid change
I misspoke earlier, by clutch engaged I meant "foot off of the pedal"
...... That sounds like the throw out bearing your hearing.
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Old 12-03-2013, 04:45 PM   #15
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Quote:
Originally Posted by jcamo View Post
...... That sounds like the throw out bearing your hearing.
With foot off of the clutch, it should not be the throw out bearing. I'm thinking the input shaft bearing....... It is quiet when the fluid is cold. So I was hoping that a fluid change to RP might cure it. I've already changed the fluid (replaced with factory fluid), but no difference.

Apologies for the hijack of the thread
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Old 04-02-2014, 04:52 PM   #16
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Quote:
Originally Posted by SteveV View Post
I replaced all 3 of my primary drive fluids with RP Friday, 11/29:
- Max Gear 75w90 in the diff (didn't need to add any additive)
- Synchromax in the tranny
- Royal Purple 5w30 in the Engine.

The shifting has smoothed out quite a bit. No noise out of the diff.

Put 150 miles on her this weekend after doing the fluids on Friday. Running great.

How much do we need to buy of 75w90 to put in the diff?

Is there a Tutorial plz?

Thx
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Old 04-02-2014, 08:25 PM   #17
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GM LS gear oil for my diff only. Royal purple chattered in my '12 SS, I switched to GM LS gear oil and it shut up. No more royal purple for this guy
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Old 04-03-2014, 12:28 AM   #18
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How much do we need to buy of 75w90 to put in the diff?

Is there a Tutorial plz?

Thx
The left side of the diff has 2 plugs, top for filling and the bottom for draining. It's simple... drain,..fill,.. drive. I even did it with the car on the ground. Takes 1 qt I believe. Check the manual it has the capacities listed.
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Old 04-03-2014, 12:47 PM   #19
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Old 04-03-2014, 05:27 PM   #20
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I switched my rear diff oil over to Joe Gibbs Driven Gear Oil and love it. I also switched my engine oil to Driven LS30
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Old 04-03-2014, 08:15 PM   #21
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Stay away from Royal Purple that stuff is junk! I used it in my 2005 GTO and took that crap out after 500 miles. Was having diff chatter(cone spring diff) and leaks right after I put it in. If your going to an aftermarket fluid, try out Redline. They also make their own limited slip additive in house. Locally made here in NorCal and we use it exclusively at the shop. Ive been building diffs for years, custom and OEM fitment, and the only fluid I will use is Redline in either 75w90 or 75w140 for towing/racing and some OEMs require 75w140. Just my 2 cents, Ive seen too many differential failures from crap lubricants to take any chances playing Russian roulette on my own and my customers cars.
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Old 04-03-2014, 09:02 PM   #22
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Add me to the RP diff chatter club! :(

Started within a day of switching. Just keeps getting worse day by day.
Think I'll leave the rest of my RP for topping up the diff in my tractor, and get some GM juice for the Camaro.
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Old 04-03-2014, 09:25 PM   #23
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Yup, chatter here too, see post 9 for my story. I'll be changing it out shortly, probably going redline 75w90. Changing the tranny to redline D4 as well since the GM stuff gives me a crunchy 1-2 shift until it's warm.
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Old 04-05-2014, 02:21 AM   #24
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I haven't switched anything in my 14 1LE yet but I swear the only stuff that worked wonders on my turbo silvia was redline. I had a grind in 1-2 when cold that no matter how you drove it would grind going in, added gear oil and lightweight shockproof together in the trans and that thing shifted like butter and never ever grinded again. Ran the redline in the vlsd diff too and worked great. To this day that is the only stuff I have ever used that I can actually say worked all the other stuff I have used royal purple, lucas etc. seemed like snake oil to me. I will be switching to this stuff soon just don't wanna get any flack from the dealer for switching while under warranty.
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Old 04-05-2014, 10:27 AM   #25
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I just bought Redline for my tranny and diff. .. I haven't put in yet. Anyone have to add additional friction modifier to the rear?
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