Diff question???

Submitted: Friday, Jan 22, 2010 at 19:01

ThreadID: 75414 Views:2828 Replies:2 FollowUps:9

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Member - Christopher P (NSW)

How much is acceptable diff wear??? I just pulled the rear diff out of my old girl and i could hold the crown wheel and move the pinion like 2-3 mm!

Just spent the day under her trying out the newish 5 speed, and thought i would pull the diff out to see if it is causing the wierd noise i have. Had a quick look at the other two i have and one has around the third of the free play??

Any help would be apprieciated.

Thank you.

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Reply By: Member - Timbo - Friday, Jan 22, 2010 at 19:20

Friday, Jan 22, 2010 at 19:20

While I'm no diff expert, it is normal to have a bit of free play in the diff (I think it's called 'backlash'). It can usually be adjusted to some extent, but you'd need to check what the manufacturer's recommended tolerances are for that particular vehicle/diff.

What sort of weird noise was it making?

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Follow Up By: Member - Barnray (NSW) - Friday, Jan 22, 2010 at 19:29

Friday, Jan 22, 2010 at 19:29

Backlash should be about 10-15 thou. so you diff is in for a major O/haul. Barnray

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Follow Up By: Member - Barnray (NSW) - Friday, Jan 22, 2010 at 19:32

Friday, Jan 22, 2010 at 19:32

Backlash is measured by holding the pinion and moving the crown wheel back and forth and checking with a dial indicator. B

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Follow Up By: Member - Christopher P (NSW) - Friday, Jan 22, 2010 at 22:18

Friday, Jan 22, 2010 at 22:18

Thanks guys, yeah i think it might be due but at $500 approxiamately for a crown and pinion????

Unless someone has a job for me in I.T.

i have 3 of the most expensivee hobbies

1: computers

2: 4wd driving

3: internet shopping.

My poor minister for war and finance!!!!!

FollowupID: 669864

Follow Up By: Member - Christopher P (NSW) - Friday, Jan 22, 2010 at 22:19

Friday, Jan 22, 2010 at 22:19

Oh bearings feel fine as well!!!!!

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Follow Up By: Member - Christopher P (NSW) - Friday, Jan 22, 2010 at 22:20

Friday, Jan 22, 2010 at 22:20

The wierd noise is vibration and a rumbling soundish type of thing!!!!

FollowupID: 669866

Follow Up By: dbish - Saturday, Jan 23, 2010 at 15:42

Saturday, Jan 23, 2010 at 15:42

Difs dont normaly viabrate sounds more like Uni joints???? Daryl

FollowupID: 669952

Follow Up By: kiwicol1 - Saturday, Jan 23, 2010 at 21:41

Saturday, Jan 23, 2010 at 21:41

dbish

yes they will, if you dont run the correct LSD oil.

LSD oil is self depleting and useualy has a life of 20 to 30 thou ks and needs to be changed religiously. read yor service book, it says it all.

I learnt this by listning to a diff specialist.

Changing the oil can have a big impact on a vehicle.

Oils and Filters are cheap

Col

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Follow Up By: Member - Christopher P (NSW) - Sunday, Jan 24, 2010 at 11:04

Sunday, Jan 24, 2010 at 11:04

Well last night i got out the feeler guages and selected a few, then narrowed it down to one that said 15, inserted between pinion and crown and tried to move the crown, there was bugger all movement from anywhere. I don't have a dial indicator, the feeler guages is all i had. So then if Barnray is correct, the diff is still within tolerances, no blame apportioned to Barnray if i surmise wrong.

I plan do rebuild the rear end soon. i have the wheel bearings kits all i need now is a rebuilt diff.

So if i get all of the stuff and take the unit down to the diff blokes will they finish the diff off to spec's?

i only get the best oil's and lubes, due to the fact it is cheap insurance!!

new oil: $40
new filter: $ 15

new motor: $ 1000

just doesn't balance does it.

So amen to that brother!!!!

FollowupID: 670071