IRS diff swap out

[NCII40]

My R31 3.89 diff with 4 pinion VL turbo LSD is on its way

Had it built by Glenn in Dandenong ( vicmelboz differential )

Can someone please give me a guide on how to do the diff swap

I have never done an IRS diff before

Cheers

[NCII40]

anyone help

[mcfly94]

So youve had this built all into an au housing?
if not youll have to pay someone to do that.

But if all in au housing ready to go its pretty easy, remove spring assemblies, undo top control bolts to stub, undo tailshaft, remove half shafts, undo 3 bolts and its out, reverse the procedure.

[NCII40]

Yes built into AU housing , all ready to install once it arrives

Thanks for the guide mate,
Is there any other heads up like may need to replace anything through out the swap out?
Any special tools that i may not have? etc

cheers

[NCII40]

Need Help Please

Exhaust is out
tailshaft will be out shortly
how do i remove half shafts,

where is the bolt for the remove spring assemblies,and top control bolts to stub,

cheers

[mcfly94]

crow bar gently or big tyre lever will pop the half shafts out

bolt is right at the bottom of the shock and inside the towers of the car, top lca bolt to stub is pretty clear to see, wont miss it.

[NCII40]

Thanks for your help

Tail Shaft out
abs sensors off
shocks out
2 bolts rear of diff out
1 bolt under diff loose

do i jam my massive screwdriver here as pictured to pop these half shafts

[NCII40]

can anyone help

[NCII40]

bump.............................................. ....
do i need to remove brakes and hubs or not

[BOTTLEDUP]

Sounds like you need a workshop manual...

[NCII40]

i do but thanks

[T MAN]

Originally Posted by NCII40

bump.............................................. ....
do i need to remove brakes and hubs or not

yes, undo and move the brake caliper to one side, undo the top and bottom bolts holding the hub upright and carefully leaver the drive shaft between axle and centre housing and with a little force it will pop loose.. pull the shafts out enough to clear the centre..

[NCII40]

Originally Posted by T MAN

yes, undo and move the brake caliper to one side, undo the top and bottom bolts holding the hub upright and carefully leaver the drive shaft between axle and centre housing and with a little force it will pop loose.. pull the shafts out enough to clear the centre..

Thanks T-Man

One side popped out, had to remove toe link on drivers but passenger wont budge and the bolt holding toe link in on sub frame fails on fuel tank so i cant get it out

gonna need new upper and lower control arm bushes now and toe links

[T MAN]

You can undo the toe links from the hub end..

[NCII40]

Originally Posted by T MAN

You can undo the toe links from the hub end..

I cant get it budge

[NCII40]

Originally Posted by T MAN

You can undo the toe links from the hub end..

Got it, bashed it with hammer
3.9 diff in all back up except exhaust

my procedure i did

Crack wheel nuts
Jack car + stands
Take wheels off
Undo cat back and remove
Remove tail shaft but mark all points and locking nuts
remove brake calipers and set aside on milk crate
take off rear discs
Remove Rear shocks and spring complete unit


remove rear toe link on hub, its just one nut but your gonna have to keep nut on the end and bash it with a hammer up so it will pop out cause my were a pain and i don't know why and now i need new ones but anyway

remove upper control arm bolt need breaker bar, beware of falling perished bush particles
remove lower control arm need breaker bar , beware of falling perished bush particles
get another milk crate ready and pull toward you the half shaft and then reach in and pull it out of diff, crow bar and screw driver did damage and wouldn't pop it
Remove abs sensors
Drain diff oil
2 bolts rear of diff remove
get jack under diff with wood ready to drop
1 bolt under diff undo
drag diff out on trolley jack