Outer Limits 4x4 Board

Is a 4.90 ratio 'close enough' to a 4.875 to not be damaging a transfer case?

Most of my driving is on softer surfaces. The higher ratio (4.875) would be in the rear.

The difference between 4.875 and 4.90 is approximately half of one percent.

If you're running 33" tyres, that's equivalent to 4.3mm in overall diameter, or just over 2mm in radius.

What's your tread depth? 10mm? You'll get a bigger difference if you run new tyres on one axle, and 30% worn on the other.

Just do it.

Should be fine.

Ford ran 4.10 in one end and 4.09 in the other in stuff for years and years from the factory.

You might not want to use 4WD high range on hard packed surfaces though (and why would you?) you might find a bit of bind that makes it hard to get out of 4WD.

Steve.

Thanks guys, when you put it into perspective like that its pretty darn close.

If it is onto harder surfaces the centre diff would absorb any differences anyway when in full time 4wd unlocked.

Subarus ran 3.909 in the rear and 3.9 in the front....probably still do.