Gear Oil & 12 Bolt
02-01-2004, 03:31 AM
#1
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Gear Oil & 12 Bolt
What kinda gear oil are you guys running in your 12 bolts? I have always used non synthetic in my stock rear cause I know that's what your supposed to run with the stock diff's etc. But the 12 bolt will be here this week and Im running a full spool now so Im wondering if synthetic will be a better idea. Also there is no need to run limited slip additive anymore I presume.
02-01-2004, 11:55 PM
#7
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I am the odd ball 
I run Kendall 85-140 to keep shock loads in check It is over kill but I do have to drive 100 miles to race and then home again.
A thin Synthetic should be fine as the other guys said.
I run Kendall 85-140 to keep shock loads in check It is over kill but I do have to drive 100 miles to race and then home again.A thin Synthetic should be fine as the other guys said.
02-02-2004, 12:22 AM
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All the new highway trucks use 75w90 synthetic in the diffs. Pulling 60,000 pounds through 18 gears is a lot of stress on the diff. They've also extended the oil change requirement with the synthetic to 500,000 miles. Mineral oil was only 120,000 miles. That's saying a lot for the synthetic oil.
02-02-2004, 01:45 PM
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Yea I was talking with moser today and they were saying to run non-syn 
I told them even without a diff and he said YES because that's what the gear company tells them to run 
Im sure it's prolly just some tech guy that reads something off paper and prolly has no shop experience so oh well..
Does anyone know how much gear oil the 12 bolt takes?
I told them even without a diff and he said YES because that's what the gear company tells them to run Im sure it's prolly just some tech guy that reads something off paper and prolly has no shop experience so oh well..Does anyone know how much gear oil the 12 bolt takes?
02-03-2004, 05:25 AM
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I'll say it once more: run dino juice (non-synth) in your diff if you have a friction/clutch type posi and also use friction modifier. AFAIK all of the posi's are designed for regular (non-synth) lubricants.
Rich Krause
Rich Krause
02-03-2004, 01:09 PM
#11
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Originally posted by rskrause
I'll say it once more: run dino juice (non-synth) in your diff if you have a friction/clutch type posi and also use friction modifier. AFAIK all of the posi's are designed for regular (non-synth) lubricants.
Rich Krause
I'll say it once more: run dino juice (non-synth) in your diff if you have a friction/clutch type posi and also use friction modifier. AFAIK all of the posi's are designed for regular (non-synth) lubricants.
Rich Krause
Thats what this whole thread is about
02-03-2004, 03:17 PM
#13
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Originally posted by rskrause
DOH! Well then, run synth!
Rich
DOH! Well then, run synth!
Rich
02-06-2004, 10:01 PM
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They say that because that is what the gears are cut for. The new gears in the truck you are talking about are cut in a different way and even setup different in many cases.
They may also Void any Warranty you have if you run Synthetic....then again Moser offers NO warranty on the damn thing So run the synthetic
They may also Void any Warranty you have if you run Synthetic....then again Moser offers NO warranty on the damn thing So run the synthetic