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Diff fluid change

90K views 19 replies 13 participants last post by  Jorge570  
#1 ·
What weight diff fluid is everyone running in the front and rear? I’ve seen a few different people running 75-140 in the rear and gearbox and 75-90 in the front diff while some others running 75-90 in both front and rear diff. I just drained front and rear diff at 260 miles for the first service and put 75-90 in both front and rear as per what the dealer sold me. Is this fine or should I drain and refill with the 140w?

Also saw mixed answers on how much to fill rear diff. Some say an inch below fill hole in rear and some say to fill up to the hole as same as front diff.

I run a 2017 outlander 1000r xtp with 28” sti outback max Tires and do some hard riding/mud so the diffs are doing some work


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#2 ·
My books says to run 75-90 in the front and 75-140 in the rear and that is what i run. Now if i did not have one of the other i wouldn't hesitate to fill both diffs with the same fluid. Park it on level ground and fill till it poors out. I cant see a half inch below the fill hole let alone a whole inch. Check your diff fluids for low levels, mud or water every now and then.
 
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#8 ·
My books says to run 75-90 in the front and 75-140 in the rear and that is what i run. Now if i did not have one of the other i wouldn't hesitate to fill both diffs with the same fluid. Park it on level ground and fill till it poors out. I cant see a half inch below the fill hole let alone a whole inch. Check your diff fluids for low levels, mud or water every now and then.
Your first sentence is correct, the rest of your post is inaccurate. If you fill the rear pot until it pours out, there will not be adequate room when the oil expands with the heat & you could blow a seal. Use a small wire with a 90 degree bend @ 1 1/4" from the end of the wire for checking proper oil level. As for gear lubes 75-90 and 75-140 are not in the same ball park. Your last sentence is also correct.
 
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#7 ·
I changed mine at 145 miles and it was clearly ready to be changed. Had a very metallic look to it, better safe than sorry. Refilled with specified full synthetic fluids till I seen it flow out of the fill hole. It's cheap insurance, 400 miles, I would like to see how that looks, I would change that before you hit the trails.
 
#13 ·
Bingo. That’s what I do too....measure it.
 
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#14 ·
OK I drained the rear diff tonight the oil coming out was beautiful. I measured the new oil and put it in and used a wire bent at 1 1/4 inches the oil level was just shy of an inch below the fill plug hole. The temp here was in the low thirties today so I am sure there could have been a bit of oil in the diff yet. I meant to measure it before draining but forgot. After seeing the rear oil I didn't bother to do the front the owners manual as far as I can tell says change at 4000 miles or 200 hours I do not mud or beat my machine I think I will wait until at least a thousand miles before changing again.
 
#15 ·
The measure of an 1 1/4 is for g1 diffs , it is 9/16 for the rear of the g2 diffs.
 
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#19 ·
I just changed the rear axle CV Boots on my 2007 Outlander and am wondering if anyone knows if you need to top off or change the diff fluid after taking the axles out of the diff?
If no oil came out , one could assume that the existing level will be the same .
However , if the oil was (too) low to begin with , it wouldn't have come out when you pulled the inner shaft out .
IMO , it's NEVER wrong to check / change fluids .
Clean oil is good oil
Peace of mind is priceless .
-Bonz
 
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