Vehicle & Technical > Discovery

Just blown my rear diff.... DOH!!!

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extreme90:

--- Quote from: "Iain C" ---Hmmm, does fitting bigger tyres mean diffs blow more easily?

Like 265/75s for example... :cry:
--- End quote ---


not really, i aint blown a diff for years, even on 35" simex

it all comes down to how heavy your right foot is when your stuck and spinning the wheels  :wink:
too much, the sun gears weld themselfs to there shaft and then bust

try keep the revs down to 1100rmp and less, i never go above that and tend to stay at 900ish when winching

but old age plays a good part
dan

Disco-Ron:
I haven't recently driven mine hard, mostly gentle road work, certainly wasn't spinning anything when it broke..... anyway, if it breaks again the skinny tyres will show themselves again.....

cardiff_gareth:
If you need a complete rear axle then go on Ebay, communitys and look for Ebayer name: littlepinkpecker. He lives in Cardiff and breaks Discoverys. I know in 2 weeks time he is breaking a N reg 3.9 that had 113k miles on it. If you contact him before then he might sort it out for a cash pick it up price rather than Ebay listing.

I've bought loads of him - good guy  :wink:

clbarclay:

--- Quote from: "Iain C" ---Hmmm, does fitting bigger tyres mean diffs blow more easily?

Like 265/75s for example... :cry:
--- End quote ---


As pointed out driving style makes a great deal of a differance (the differance between shock loading and a constat load is vast), but putting that to one side the answer is Yes.

Larger diameter tyres require a higher torque to be applied to turned (its simple maths). Using more complex maths we can consider rolling resistance where typically a wider tyre has a greater resistance to turning so requires a greater torque still. This higher torque increases the stress throughout the whole drive train.

265/75r16 are fitted as a standard size on land rovers so the diffs should be OK depending how its driven.

Disco_Stu:

--- Quote from: clbarclay ---
--- Quote from: "Iain C" ---

265/75r16 are fitted as a standard size on land rovers so the diffs should be OK depending how its driven.
--- End quote ---


I thought 235/75 was the max standard LR tyre. I tried to put 265's on with a 2" lift and with/without spacers and they still foul.

Stu
--- End quote ---

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