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Old 05-17-2008, 12:14 PM
mtncrsr mtncrsr is offline
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Default Gear Lube for my 40

I know that there are a lot of different brands of gear lube out there and probably as many opinions on what is best. What do you guys suggest for diffs, tannys, and t-cases, Lucas, Redline, Purple Magic or whatever its called or something else. Also, what do you recommend for a viscosity or oil weight, 80W-90W, 85W-140W?
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Old 05-17-2008, 12:43 PM
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I used Redline 75W90 synthetic in my diffs and tcase recently. Seems like good stuff. You probably can't go wrong with any of the premium oils.

It's called Royal Purple, FYI.
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Old 05-17-2008, 12:43 PM
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I like the Redline 75w-90 personally.
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Old 05-17-2008, 07:23 PM
mtncrsr mtncrsr is offline
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Thanks guys. Any suggestions as to a good place to purchase Redline in the Denver metro area?
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Old 05-19-2008, 10:46 AM
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I will argue that you may see more leaks with synthetic in an FJ40.

I have found that synth. gear oils in older trucks tend to leak where regular oils haven't. YMMV. I run regular old cheap 80w-90 from a 5 gal pail ($30+ at Advance Auto). It's not like my FJ40 is the 'high gas mileage rig of choice'. 75-90 would be fine, too, I'd think.
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Old 05-19-2008, 11:05 AM
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80w-90... regular old dino like steve said in a 5 gal bucket. If your running a lockrite or aussi 80-140w. No need to pay more for syn.
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Old 05-19-2008, 11:15 AM
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x3 what Steve and Wes said. I replace the oil often enough that synth wouldn't be worth the $. Plus it will likely cause leaks as mentioned. My transfer case also likes to pump the trans full of oil, so I'm always draining and refilling. Cheap 5 gallon bucket of stinky 80W90.
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Old 05-19-2008, 11:25 AM
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Quote:
Originally Posted by wesintl View Post
80w-90... regular old dino like steve said in a 5 gal bucket. If your running a lockrite or aussi 80-140w. No need to pay more for syn.
I have ARB's. Does that make a difference?
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Old 05-19-2008, 11:29 AM
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Quote:
Originally Posted by MDH33 View Post
My transfer case also likes to pump the trans full of oil, so I'm always draining and refilling.
There's a fix for that. Did it 5 years ago on my 40, and have now forgotten the details. I think there is a seal that needs to be replaced between the transfer case and transmission. Did it when we put the Mark's gears in my transfer case.
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Old 05-19-2008, 11:31 AM
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Quote:
Originally Posted by mtncrsr View Post
Thanks guys. Any suggestions as to a good place to purchase Redline in the Denver metro area?
Details in this thread (post 8). I went to 3R Racing because they answered the phone when I called them.
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Last edited by Hulk; 05-19-2008 at 12:07 PM.
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