LSD L series

tambox · Post by **tambox** » Sat Aug 24, 2013 7:48 pm

No you cannot just swap the crown wheel, well you could, but;
They are a matched set, refer to OEM manual. 39/10 or 37/10 are the gear sets, hence the pinion teeth are thinner in the 3.9.
The 3.9 diff setup is weaker, thats why they were only released for a limited number of years, thats why they are hard to get (breaks pinion teeth off).
I have broken a few of them, never broken a 3.7 or a 4.1.
Non turbo EA82, the 3.9 should be fine, just be carefull with dumping the clutch, thats when I broke any of mine.

pzs · Post by **pzs** » Sat Aug 24, 2013 8:00 pm

El_Freddo wrote:I was under the impression we're talking about an L series here - correct?

I only ask as the L series gearbox can't have the pinion shaft swapped out like the EJ AWD gearboxes can. Unless you're going to use an EJ gearbox in the L series, if that is the subi you have that we're discussing...

Cheers

Bennie

That's correct Bennie, stock standard L series with 14 inch wheels, tyres are yet to be fitted...price dependant.

I'll be fitting a disc brake (hopefully) LSD rear end in it...just got to get it from Melbourne to Alice $$$. I want lower gearing.

Tambox, you mentioned in your post, a 4.1...that would be good, how, what from, etc.

thanks for all the info I've been offered.

tambox · Post by **tambox** » Sat Aug 24, 2013 8:08 pm

A 4.1 is a $custom made$ setup.
It uses a liberty 4.1 crown wheel/pinion.
The pinion is cut and welded to the L series pinion.
Never broken one and given them a hard time.
Only ever done it with centre locking diff gearboxes, but should be ok for any L box.
Very good gear ratios with 14" wheels.

Mitchhsj · Post by **Mitchhsj** » Sat Aug 24, 2013 8:19 pm

I wonder if the little auto rx turbo I'm wreaking had a LSD? might swap it over i only have the rear disc brake set up left to do.. cleanest little car i have ever seen, so sad to pull it apart.. half way through putting the dash, seats, centre console and even the carpet in a brumby at the moment. with a vortex ea82t {spider manifold} just to finnish the wiring and inside now and its ready for action

pzs · Post by **pzs** » Sun Aug 25, 2013 8:46 am

tambox wrote:A 4.1 is a $custom made$ setup.
It uses a liberty 4.1 crown wheel/pinion.
The pinion is cut and welded to the L series pinion.
Never broken one and given them a hard time.
Only ever done it with centre locking diff gearboxes, but should be ok for any L box.
Very good gear ratios with 14" wheels.

Tambox, where do you have the parts modded, Icahn do the build, but I would need a guy to mod the parts who knows what is needed

tambox · Post by **tambox** » Sun Aug 25, 2013 9:22 am

The standard dual range L series box has a different shaped pinion to the L series LCD box.
The LCD L series box pinion is similar to a liberty pinion, that is why they can be matched up.
A bit of investigation would be required to see if it is viable with a standard L series box.
You can put the complete gearset from an early Liberty into the L series casings, to give you a 4.1 diff ratio. Then the Liberty Viscous coupling can bolt on the back, will need tailshaft and gear linkage mods.
If you want a locked centre diff, you could try and find a good LCD box, then do the pinion cut/weld.
You can also do the same with a 4.44 front diff.
It is not a straight forward job, gears need machining to fit and their are a range of 1-5 gear ratios to select from.
The welding can be done by an engineering place, shop around, it can be hard to find some one that knows how to do it.

steptoe · Post by **steptoe** » Sun Aug 25, 2013 9:39 am

sounds like someone is in the know !

YouTube · Post by **El_Freddo** » Fri Aug 30, 2013 10:26 pm

tambox wrote:A bit of investigation would be required to see if it is viable with a standard L series box.

I don't believe you can - I'm sure the PT4wd pinion shaft has the lower gearset pressed/cast on to it. I've wanted to investigate this further to prove that it is actually the case, but don't have a gearbox available to do it with...

tambox wrote:You can put the complete gearset from an early Liberty into the L series casings, to give you a 4.1 diff ratio. Then the Liberty Viscous coupling can bolt on the back, will need tailshaft and gear linkage mods.

Pretty awesome that we can do this - in the US they don't have dual range EJ boxes to play with.

tambox wrote:If you want a locked centre diff, you could try and find a good LCD box, then do the pinion cut/weld.

Or go with the DCCD centre diff setup, apparently it's a great setup once you've got the controller sorted. But if you go anything EJ in the EA casing you'll need to mod the tail shaft, gearbox crossmember and gearshift linkages

Cheers

Bennie

tambox · Post by **tambox** » Sun Sep 01, 2013 8:18 pm

The bearings for the lower gear set in a standard L series box are pressed onto the pinoin, 3/4 are pressed onto the pinion.
This just changes where to do the cut/weld.
It means instead of just the rear wheels running through the cut/weld, all wheels will.
Know a really good welder?

The LCD and Liberty box gears are on a sleeve that slides onto the pinion, making this mod a lot easier/less stress.