fbekholden.com

Hello All.
I have just pulled the diff center from the EK ute to fit a 3.55. The center I removed had no stamp on the front collar and I just found these numbers after HOLDEN 740395 MN can anyone identify this center?

If the centre is out just read the ratio off the crown wheel ???

What where the numbers actually stamped in? The case or crown wheel gear? I think your a digit short too.

it is stamped on the crown wheel 7407395 MN

If I read that part number as 7407395, then the Master OldFarts Dogologue indicates that it is a differential pinion flange slinger for FJ from engine number 136885.

Cheers,
Harv

Yeh I read that too Andrew.
The part number pictured does match what I have here for a 3.89 crown wheel. The number is pretty much useless as a reference in the master cat as it only lists matched set crown wheel and pinions by different numbers. The part number stamped on the crown wheel would have been for identification prior to lapping and setting with its mating pinion gear. After that both gears would have been stocked as a set under another number. No other numbers are on the crown wheel apart from engraved serial number and pinion positioning dimension.

thanks Gents that explains the old girl howling its head off at 60mph with 185/75/13's
It will now have a 3.55 and 185/65/14 's

My calculations say you would be reducing your revs at a mile a minute from 3279 to 3051. Equivalent to 7.5% overdrive.

If you were to stick with your current wheel tyre combo and just change the centre you would achieve a 10% overdrive. Something to think about.


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OK thanks Errol. We are going to Gosford next week and will try both sets.
Going to that museum with our car club on Saturday

Here is the update on the Ute. This past weekend we traveled just over 500 miles round trip and it ran just great (saw a black sedan heading north at Port Maquarrie and just thundering )
She has stopped howling at the 60 mph now. I agree that the 13's may be better so will try that again.
This is it's second large trip since I got it out of a shed No problems

Good stuff, do you know what the engine rpm is at 60 mph?

Regards
Stephen

Thanks Stephen , I don't have a tach in it but it is easy on the ears now and cost around $80.00 in fuel for the 500 miles at around $1.45 per litre.
I am very happy with it
Regards Lindsay

Hi Rapps;
Now that it is running really well you can plan to come to Perth for the Nationals next year

Regards
Neil H

Yes that could be an idea.