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Author Topic: Diffs  (Read 362 times)
Snoop
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« on: November 22, 2019, 10:37:49 AM »
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Hi Guys and Girls
Thinking of changing diff centre to 3. 36 plenty of diffs for sale but not sure if I have a course spline or fine spline diff n axles! Is there any way to identify what Iím running without popping an axle out?
Also pretty sure a eh, hr, hd diff will bolt straight in without changing uni connections
Any advice appreciate.
Snoop
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Errol62
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« Reply #1 on: November 22, 2019, 01:03:30 PM »
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Most likely coarse spline snoop, unless you've fitted some thing fancy. Stock is coarse spline.

Original diff flange differs to EH on but the tailshaft flange is the same so just fit later uni joint and you'll need the u bolts which attach to diff flange.

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ardiesse
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« Reply #2 on: November 22, 2019, 05:55:10 PM »
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Snoop,

Clay's pretty much covered it.  FE/FCs have coarse-spline axles.

If the diff casting takes short bolts all the way around, it'll be a coarse-spline diff, and will suit FE/FC.

Any 3.36 from EH right through to HG will be suitable.  I have no experience of HQ-onwards to guide you though.

Rob
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Errol62
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« Reply #3 on: November 23, 2019, 01:50:22 AM »
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Most LC LJ are coarse spline too. Think XU1 May be the exemption. Very rare now so not likely. Like Rob Iíve no clue on HQ on.


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Harv
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« Reply #4 on: November 23, 2019, 07:15:00 AM »
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The banjo diffs were course spline through to early HZ (6 cylinder). The fine spline banjos were LJ XU1, LH/LX/HQ-HZ V8s and late HZ 6 cylinder.

Cheers,
Harv
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Errol62
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« Reply #5 on: November 23, 2019, 10:20:26 AM »
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God on you Harv. That completes the picture.


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Snoop
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« Reply #6 on: November 23, 2019, 10:39:21 PM »
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Thanks so much for all the info guys , all of the diffs Iíve seen advertised are course spline and I didnít know that fine spline were so rare. Thought it might have been luck of the draw what you actually have installed from factory.
Thought Iíd try a 3.36 ratio after reading some threads on the subject of diff ratios with quite a few agreeing that this is an ideal ratio.
Thanks Again
Snoop
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Dr_Terry
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« Reply #7 on: November 24, 2019, 10:35:44 AM »
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The banjo diffs were course spline through to early HZ (6 cylinder). The fine spline banjos were LJ XU1, LH/LX/HQ-HZ V8s and late HZ 6 cylinder.

Cheers,
Harv

To my knowledge fine spline Banjos began in large Holdens around early HX around late 1976 (LX also at around the same time). Late LJ XU1s and 5.0 LH/LX also had them. 4.2 V8 LH/LX had course spline.

HQ-HZ V8 & all One-Tonners had large Salisbury diffs with 28-spline axles.

Dr Terry
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fcee
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« Reply #8 on: November 25, 2019, 06:42:44 PM »
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  Think you will find the ideal ratio for a stock fc would be 3.55 .cheers Steve . Wink
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Errol62
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« Reply #9 on: November 25, 2019, 07:09:10 PM »
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Unless you're running interstate or stupidly low profile tyres on stock rims

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ardiesse
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« Reply #10 on: November 25, 2019, 09:24:48 PM »
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Unless you're running interstate or stupidly low profile tyres on stock rims

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. . . and of both I am guilty.  A 3.55 works very well in my stock Humpy, and I have a 3.36 in my FC.

Rob
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Errol62
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« Reply #11 on: November 25, 2019, 11:36:01 PM »
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I love a highway. As do a tall diff. Ar ee ar


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