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post #1 of 16 (permalink) Old 06-11-2008, 07:49 PM Thread Starter
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Diff Oil Question

What are ya'll running in the diffs. I had a small leak in the rear I plan to address soon. I havenít changed the oil since back in 2002. I was leaning toward Royal Purple. Just seeing what others are running.
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post #2 of 16 (permalink) Old 06-12-2008, 04:14 AM
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Re: Diff Oil Question

i run good old chevron 80w/90 limited slip with the ford friction modifier.

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post #3 of 16 (permalink) Old 06-12-2008, 04:43 AM
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Re: Diff Oil Question

royal purple, no additive needed. its what most everyone is using.

02 dmax cc dually 4wd "miss piggy" tow bitch, afe pr7, magnaflow, Kennedy lift pump, dual rail mount filters, PPE tunes
00 f350 srw rc=6100lbs
ats comp housing,bdp 1.0 exhaust,afe pr7,4in turbo back magnaflow,hx cross,di regulated return,bbha,dp hi,40,80e,120r,6.oh no cooler autometer gauges, dual rail mount filters
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post #4 of 16 (permalink) Old 06-12-2008, 08:45 AM
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Re: Diff Oil Question


06 F350 CC LB 4x4 with a few odds and ends
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post #5 of 16 (permalink) Old 06-12-2008, 11:27 AM
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Re: Diff Oil Question

May be a dumb question, but where might one get this Royal Purple?

Brian
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post #6 of 16 (permalink) Old 06-12-2008, 04:14 PM Thread Starter
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Re: Diff Oil Question

Quote:
Originally Posted by 99F250Smitty View Post
May be a dumb question, but where might one get this Royal Purple?
Napa, Summit and jegs carries the full line.
I think thats what I'm going to run.
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post #7 of 16 (permalink) Old 06-12-2008, 04:26 PM
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Re: Diff Oil Question

Royal Purple here with no Friction additive. The local Pepboys has it and also NAPA.

2003 F350 7.3l, 60Kmi, XLT, CC, LWB, SRW, 4X4, 4R100, 3.73LS. 4" BDS lift w/315/75/R16 BFG at's on Mickey Thompson classic II wheels. Isspro gauges, Mag-Hytec tranny pan, B&M tranny cooler w/fan. Line-X bedliner. Firestone air bags.
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post #8 of 16 (permalink) Old 06-12-2008, 04:46 PM
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Re: Diff Oil Question

Order up the 08 cover and gain a little cooling for a little cash...
Attached Images
File Type: jpg Rear Diff cover.JPG (79.7 KB, 28 views)
File Type: jpg Rear Diff cover2.JPG (66.0 KB, 14 views)

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post #9 of 16 (permalink) Old 06-13-2008, 12:03 PM
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Re: Diff Oil Question

Are you guys running different weight oils in the front and back?

Brian
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post #10 of 16 (permalink) Old 06-13-2008, 08:21 PM
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Re: Diff Oil Question

Quote:
Originally Posted by 99F250Smitty View Post
Are you guys running different weight oils in the front and back?
Yes..

75W/140 in the rear and 75W/90 in the front.

2002 Ford F350 Crewcab 4X4 SRW, Twin turbos
820 HP on 05/19/12

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