• Troubleshooting

  • Rear Diff Ratio - Same or Different over the 2004-2014 model years?

I'm thinking that my 2010 D5 XC90 reads a replacement rear diff as its starting to make a noise particularly between 60-80k's under load and on over run. It has just on 230,000k's.

Before i start looking for replacements, do all the XC90's have the same rear diff ratio's? and if not, how do i tell apart from physically measuring (Are there clues in the VIN Number etc).

Is it an easy job for a completent mechanic to just swap over diff centres etc? Any Tricks?


@timbo
I don't think the d5 ratios changed when they swapped the d5 designs around but I've not had to dig into it before... you remember offhand?
Ive only really seen issues with the 6cyl models not much experience with d5 diffs
9 days later
You tried changing the rear diff fluid?
I have found that just putting in some high quality gl5 full synthetic plus some molly additive will quiet down ones that have a little bit of noise

Otherwise...
Go via the part number

@diecast if you find they are the same across the board then I have a rear diff here from a 2006 2.5t with only 107,000km on it that I could probably pull for you. I was going to grab all the haldex bits out of the car before I wreck it.
21 days later
Thanks Bear and Paul.
Bear I’ll try changing the fluid and adding moly, might cost a few bucks but easier than contacting Paul for another diff.
Paul, if you could hang on for a month whilst I try the diff oil change that would be great
Thanks in advance
11 days later
@diecast the parts car has now gone to @Philia_Bear if you still need a diff
Nelpd96;c-153753 wrote@diecast the parts car has now gone to @Philia_Bear if you still need a diff
I'm pulling it out shortly as well
Happy to let it go stupid cheap
4 days later
Thanks Bear, will try to do the diff oil change this weekend and see what happens
They break diffs. Like the S80 and xc70 and v70..
5 days later
Update - I changed the diff oil with some Penrite GL5 75w-90 full synthetic and squirted in some Nulon Gearbox and Diff treatment and....it's not perfect but certainly quieter to my ears. The oil i sucked out with a syringe looked like brown metallic paint. The photos speak for themselves - new v's old oil


Good idea, I’ve got plenty of oil & Nulon left over. I tried to buy a moly additive but couldn’t find one in Supercheap or Bursons so had to buy Nulon
I'm planning on doing the same with mine. I'm typing my oil won't look much different.
Easy job, I just bought a oil syringe ($50) as you need it and added about half a metre of hose to it.
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