Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Diff question

Donny94

New Member
Joined
Dec 17, 2018
Messages
5
Reaction score
2
Points
3
Age
27
Location
Tara qld
Members Ride
Vy commodore
Alright, recently got a 4 bolt 3.46 lsd diff & a 3 bolt 3.08 open diff, I've pulled the lsd centre out & put the 3.08 gears on & put it back into the 3.08, everything seems fine, but I have a slight bit of free play between crown gear & pinion where they don't touch when going from spinning one way to the other , is this normal to have a this gap in between directions?
 
H

harrop.senator

Guest
Depends on how much play it needs to have some backlash. With an IRS at a minimum you need to mark count the turns at a minimum when undoing the pinion and side bearing cups of the gears you're using.

Should also then use Prussian blue to check the lap before running it. And a dial gauge to read the backlash. Also make sure the side bearing retaining clips are put back on.

Should have you have just run the 3.46 diff a 3 bolt tailshaft and got the Speedo calibrated? Much easier and a decent upgrade.
 

immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
18,912
Reaction score
9,713
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
Problem is, the 3.08 diff gears are for a M75/M78 centre and the 3.46 gears are for the M80. The M80 and M75/78 have ever so slightly different offsets where the ring gear bolts onto the centre.
 
H

harrop.senator

Guest
Ahh yes they do , I forgot 3.45 was 75 and .46 was the 80. Good spotting.
 
Top