diff question

Submitted: Monday, May 05, 2008 at 10:28
ThreadID: 57290 Views:1348 Replies:6 FollowUps:2
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just been doing a major service on my GQ 2.8td yesterday. Why is the front diff twice as big as the rear diff (in oil capacity terms)?
Why also are they different grades of oil?
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Reply By: Member - joc45 (WA) - Monday, May 05, 2008 at 11:24

Monday, May 05, 2008 at 11:24
Hi Gossy,
The front diff has the pinion gear up above the centre line of the axle shafts, whereas the rear diff has the pinion below the centre line. Having it above means that the oil must cover the pinion, and therefore the casing must be filled higher.
The rear diff uses hypoid oil with LSD additives, whereas the front diff, without an LSD only needs standard hypoid oil.
Gerry
AnswerID: 302112

Reply By: Gossy - Monday, May 05, 2008 at 11:35

Monday, May 05, 2008 at 11:35
Ah, makes sense. Thanks for that.

Not the most enjoyable job being under a car for a whole day upside down using a little hand pump to get the oils in, but it's also very satisfying getting to know your own car a bit better and not paying a mechanic for simple work like this (but time consuming). Finished up doing both diffs, engine, all filters, wiper blades, transfer and gear box.

Cheers,
AnswerID: 302114

Follow Up By: Member - Davoe (Yalgoo) - Monday, May 05, 2008 at 12:48

Monday, May 05, 2008 at 12:48
Been there done that. Get your self a cheap 5 l weed spray pump and take the trigger/nozzle off it leaving just the hose.
this way all the pumping can be done in no time without laying underneath
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FollowupID: 568149

Reply By: Cupie - Monday, May 05, 2008 at 13:36

Monday, May 05, 2008 at 13:36
G'day .. Had the same problem with the oil. My solution was to use gravity & a long tube thru the lid of a bottle with the base cut off (like a funnel). Positioned the bottle in a comfortable position filled it & waited. Worked OK but I might try the weed spray idea next time.

cheers .. Cupie
AnswerID: 302128

Reply By: Member - Mark E (VIC) - Monday, May 05, 2008 at 14:36

Monday, May 05, 2008 at 14:36
Anyone hear of a 20l drum pump? If you plan to do enough of this home servicing stuff, I would highly recommend one. I went through all the other options long ago and wouldn't go back to ANY of them.

20 litres of each of these oils will last quite a long time.

They're not that expensive and the cost will be saved with the first thorough service you do yourself.

Image Could Not Be Found

Cheers,

Mark
AnswerID: 302131

Follow Up By: kiwicol - Wednesday, May 07, 2008 at 18:43

Wednesday, May 07, 2008 at 18:43
couldnt agree more, money well spent and cheaper to buy oil in bulk. Also LSD oil is self depleting so should be changed every 20,000ks. Col
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FollowupID: 568610

Reply By: obee - Monday, May 05, 2008 at 21:44

Monday, May 05, 2008 at 21:44
change the the coolant too and use ion free water with the additive. Change the brake fluid. Change the power steering fluid. Thats what I do anyway every fifty thou tho they say forty in the book.
AnswerID: 302229

Reply By: Gossy - Wednesday, May 07, 2008 at 09:21

Wednesday, May 07, 2008 at 09:21
rest is getting done in a major service today (double crossing of the Simpson in 4 weeks). Garage not well equipped to do messy jobs like radiator flush etc.
AnswerID: 302443

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