These are the things under the back of your van/ute/car..there is quite a few diffs but the factory ones are either banjos which all 6 cylinders had up to hz or salisburys which were in the hq to hz v8s.we shall be looking at ratios and sizes and limited slip diffs.
lets start with...
LARGE 10 BOLT SALISBURYS..
Most people think the 10 bolt saying comes from the amount of bolts that hold the hat on at the back..its actually how many bolts hold the crown wheel to the hemisphere..
Utes,vans and 1 tonners have leaf springs and sedan,wagon statesman have coil springs so car stuff wont fit as a unit axle to axle straight in your ute/van without modifying the housing..
1 tonner will fit ute/van but the pinnion yoke has larger universals and larger u bolts,easlly distinguished in a car as the 1 tonner u bolts have 1/2 inch nuts and the v8 ute/van has 7/16th.
The ratios across the board are 2.60 2.78 these are usually a car type ratio 3.08 3.36 3.55 usually the ute/van ratio and optioned performance for other models..4.11 4.44..only a 1 tonner ratio and they tell me the 4.11 was used for racing in a9x but rarely seen..myth?
Note in the pic below that the diff at the front has no ears cast on it..this meens it is unique for ute/van/tonner..the hat on a large 10 bolt measures up and down 250 ml and side to side 290 ml..
SMALL 10 BOLT SALISBURY..
These were only in wb 6 cylinders and are refered to as small 10 bolts but technically the saying is wrong..yes there is 10 bolts holding the cover on but only 8 bolts hold the crown wheel..these are hard to distinguish from the heavier 10 bolt out of a car if you have no experience so it is always better to remove the hat and count the bolts holding the crown wheel..the gears in these are the same as banjo diffs..the hat on these measure 250ml top to bottom and 240 ml side to side..
Note the different shape of the hat to the large 10 bolt..
BANJO DIFFS..
These are in 6 cylinder cars [also in hktg v8 and torana lh lx v8 with larger pinnion yoke]from the beginning of holden production but are only useable in hq to hz from the eh model.[earlier in grey motor powered cars had a different pinnion yoke].the banjo is an unboltable drop out centre..its ratios are 2.78 3.08 3.36 3.55 3.90..3.90 is only found in lh lx 4 cylinder toranas..
hq and hj origianlly had coarse spline centres and axles and hx hz had fine spline..they do interchange so always check the axle spline before presuming that you have one or the other..
The crown wheel on most holden diffs has the ratio stamped into it...this one is a 3.55 ratio.
The crown wheel is the large gear in the pic below and those little gears are your sun gears or side gears and the pinnion gear is under them.the red thing is the hemisphere..
AXLES AND SPLINES
Large 10 bolt salisburys are all classified as fine spline..
Small 10 bolt salisburys are also all fine spline but the axles from a small wont work in a large and vice versa..
Banjos in hq hj should be coarse spline and in hx hz should be fine spline and both will have the same type splined centre to take the axles..BUT..dont take this as gospel because they can be interchanged as long as you use the right axles..
Large 10 bolt axle pic below...banjo fine spline looks pretty much the same just not as fat..
Coarse spline banjo axle pic below..
Popular conversions for holdens are the ford nine inch..these are a removeable centre like the banjo
This is what a 9 inch diff under a wb van looks like..this one has been shorthened to accomadate the 15x10 wheels.
This is the centre from the 9 inch..this one had 3.88 ratio and is a full spool like a v8 supercar..full spools or mini spools are illegal for street use as they lock the 2 back wheels up putting great stress on the axles..great for drag racing and drifting..
Spooled diffs do this to axles..the spline is supposed to be straight..:knockout::knockout:
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