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80 series front diff

Tech Talk for Cruiser owners.

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Posts: 363
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80 series front diff

Post by duck »

well it has happend, i busted my crown wheel and pinion in my front diff.



so dose any one make a chromolly crown wheel and pinion for the front of an 80 and how much it will cost?



also seeing my front CVs are out i may as well change my diff gears to suit my 36s as well, so what ratio should i be going?



cheers duck
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Post by ausyota »

No chomo gears but you can get the crownwheel and pinions heat and cryo treated for better strength.
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Post by dow50r »

4.56 and an air locker, or something that it solid all round...then make up a spacer for the bearings and throw away the crush slieve. End result is a tough diff
Andrew
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Post by locktup4x4 »

I've never seen a set of chromo gears. But like stated above you can have them treated. From what Bobby Long tells me you can use both treatments on a trail rig only. But if you use it as a D.D. you will want only one treatment.

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Post by duck »

cool well ill have to look into it as it is my DD, dose it just make it a pig to drive if you have both treatments done, and a rough price on getting them done and whats the more effective.


cheers duck
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Post by ausyota »

Nah it just effects the wear rate.
When you heat treat the gears it makes them resistant to chipping but also slightly softens them making them wear more when driven daily.
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Post by crankycruiser »

best way to strengthen it is an air locker
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Post by 75 cruser »

the trend begins

air locker
longfield cvs
longfield hub gears
axles ( longfields or other )
heat treat the centre

and your away

rob
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Post by mud4b »

ok the bearing spacer i can understand but what is the actual go with the locker strengthening the crown wheel and pinion?

how does it do that?

cheers mark
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Post by hdj105 »

mud4b wrote:ok the bearing spacer i can understand but what is the actual go with the locker strengthening the crown wheel and pinion?

how does it do that?

cheers mark
The air locker carrier is stronger than the OE carrier, therefore less chance of the crownwheel flexing away from the pinion.
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Post by dow50r »

If you look at a std centre, it has two large windows that reduce strength of the pinion...all the gears ive seen broken are right above where they are supported by air...(the holes)
Toyota have put 4 pinion open centres in the latest cruisers to make the centre solid and stronger...you should too.
The ARB is solid
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Post by mule75 »

hdj105 wrote:
mud4b wrote:ok the bearing spacer i can understand but what is the actual go with the locker strengthening the crown wheel and pinion?

how does it do that?

cheers mark
The air locker carrier is stronger than the OE carrier, therefore less chance of the crownwheel flexing away from the pinion.
but it's the same carrier just with an arb centre!!?? i always thought it was because the spider gears flogged out in the stock centre and caused the diff to explode. thats what happened to mine in it's pre locker days.
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Post by mud4b »

dow50r wrote:If you look at a std centre, it has two large windows that reduce strength of the pinion...all the gears ive seen broken are right above where they are supported by air...(the holes)
Toyota have put 4 pinion open centres in the latest cruisers to make the centre solid and stronger...you should too.
The ARB is solid
Andrew

i cant do it, i have factory lockers.

cheers mark
Mud4b/ OPT, Cheap rates, Not cheap work. Search Opt- option offroad on facebook. Call or Sms 0439609525.. Sunshine coast, Eudlo, 4554.
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Post by hdj105 »

mule75 wrote:
but it's the same carrier just with an arb centre!!?? i always thought it was because the spider gears flogged out in the stock centre and caused the diff to explode. thats what happened to mine in it's pre locker days.
Terminology...

Centre = complete diff assembly as removed from axle housing (or 3rd member as the yanks call it)
Carrier = bit that carries the crownwheel, supported by 2 bearings, be it OE or ARB locker type
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Post by bj on roids »

the locker is an upgrade but isnt the be all and end all, i have heard of guys upgrading to a GU front centre in the hybrid axle?!
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Post by mule75 »

hdj105 wrote:
mule75 wrote:
but it's the same carrier just with an arb centre!!?? i always thought it was because the spider gears flogged out in the stock centre and caused the diff to explode. thats what happened to mine in it's pre locker days.
Terminology...

Centre = complete diff assembly as removed from axle housing (or 3rd member as the yanks call it)
Carrier = bit that carries the crownwheel, supported by 2 bearings, be it OE or ARB locker type
ahhh, i have always thought the carrier was the housing!!!
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