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Author
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Topic: 9 inch gear oil, 75w90?
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FSTBK65
Gearhead Posts: 483
From: Salem, Virginia 24153
Registered: May 2004
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posted 06-10-2006 02:48 PM
 
Here's my setup:
Currie housing
31 sp axles
detroit locker
3.70 strange gears
Other details in my sig. Mostly street driven, but will also see some track time.
What weight gear oil should I use? Also do I need any friction modifier?
Thanks guys ------------------
65 fastback. 302, Paxton Supercharger 7PSI, Edelbrock heads and intake,flowtechs with cutouts, x pipe and 2.5in flows. 4 speed. 368rwhp and 378ft lbs. 8.01 @ 87.72 mph 1/8 mi, 1.78 60ft.
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 06-10-2006 03:08 PM
The guy that did mine said use 80w90 with 2 oz of friction additive. Mine is an 8" with a Tarc-Lok unit, so I hope it helps.------------------
William
The easiest way to find something lost, is to buy a replacement. 68 Coupe
289
C4
3:55's/Trac-Lok
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 06-10-2006 03:25 PM
I was told to use 85-140w lube and NO friction modifier with a DL unit.------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics
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Poes Fords
Gearhead Posts: 178
From: Medford, OR USA
Registered: Oct 2004
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posted 06-10-2006 03:59 PM
You won't need the friction modifier with the locker since it does not have clutches. Gear oil varies, but I use 80w-90. Jason
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289nate
Journeyman Posts: 23
From: Los Angeles, CA
Registered: Oct 2004
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posted 06-14-2006 09:50 PM
2.2 quarts of Valvoline 85-140 gear oil is what Sutton Engineering told me when I picked up my 9" with Detroit Soft Locker. Friction modifier is only needed for a limited slip from what I understand. Had to use it in my 8" with a Currie LSD.
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