Royal Purple 75w140 Syn Gear Oil question - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 6 (permalink) Old 04-03-2010, 05:07 AM Thread Starter
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Royal Purple 75w140 Syn Gear Oil question

Hello,
I have a 2007 Commander 4.7 that i just bought with 45000 miles on it. I figured that the axle fluid has never been changed and that i had better change it. I have read really good things about Royal Purple and want to know your opinion. I believe i have the QTII. According to the Royal Purple website i do not need to add friction modifier additive to there product, what do you think? ... If you think i should still add the friction modifier addivtive to the rear axle what kind should i use and how much? How many quarts of gear oil am i going to need?
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post #2 of 6 (permalink) Old 04-03-2010, 05:21 AM
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Not the same rear end but at one point I used the Valvoline, or something that said FM was not necessary, I had clutch chatter, tried some aftermarket FM and still, clutch chatter, it wasn't until I put in the MOPAR stuff that it went away.
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post #3 of 6 (permalink) Old 04-03-2010, 05:54 AM
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If you have QTII as opposed to QDII you have open (no internal clutch type) differentials.
So, in this case, no friction modifiers are needed.

Rob


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post #4 of 6 (permalink) Old 04-03-2010, 01:32 PM
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Quote:
Originally Posted by robby View Post
If you have QTII as opposed to QDII you have open (no internal clutch type) differentials.
So, in this case, no friction modifiers are needed.

Rob
I know it doesnt make any sense but the dealer told me that the rear differential in QT II needs friction modifier due to some viscous coupler or something. I think thats there way of making more money by selling you the friction modifier.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #5 of 6 (permalink) Old 04-03-2010, 10:38 PM
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Well 07,
I have to agree.....the dealer is, by intent or mis education, selling something not needed for a QTII system.
No clutches, no viscous couplings, no nothing except gears in these differentials.

Rob


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post #6 of 6 (permalink) Old 04-04-2010, 09:09 AM
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Thats what I tried telling the dealer.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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