Rusty_T
nsw-club
Senior Member
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Posts: 680
I love YaBB 1G - SP1!
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« on: March 06, 2013, 09:56:37 AM » |
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 Hi guys, Replacing the wheel bearings and oil seal in the diff on the ute. What should the ratio be. The ute centre has a ratio stamped on it 3.89. Is that good or not. The part # on the gear and pinion in the cattledog is 7406081 doesn't match either part # on the the diff. ideas Rusty
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mcl1959
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« Reply #1 on: March 06, 2013, 05:33:27 PM » |
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3.89 is standard for all FE FC. A stockie in good order can easily run a 3.55 ratio and improve fuel economy on long runs. 3.55 ratios first appeared in the EH.
Ken
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TTV6FC
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« Reply #2 on: March 06, 2013, 09:38:51 PM » |
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While we're on the topic,are FE and FC sedan diff centres EXACTLY the same?Cheers Jamie.
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Run your fingers over my Holden and I'll run my Holden over your fingers!!!!
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mcl1959
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« Reply #3 on: March 06, 2013, 11:18:01 PM » |
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Well no not entirely, a scan through the parts book shows a change in the pinion shaft half way through FE. The lock pin also appears to be changed as well. These two items were probably changed as an improvement or upgrade. I can't see anything else different. Possibly the case casting was upgraded which would not necessarily get a new part number.
Ken
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newman
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« Reply #4 on: March 07, 2013, 07:57:21 AM » |
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3.89 is standard for all FE FC. A stockie in good order can easily run a 3.55 ratio and improve fuel economy on long runs. 3.55 ratios first appeared in the EH.
Ken
Also worth mentioning if you swap to a later diff centre (3.55) it's a different rear universal Mick  |
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FCRB26
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« Reply #5 on: March 07, 2013, 08:13:26 AM » |
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Yes thats a good point mick.
worth the effort i run a 3.36 in my stock FE good cruiser all round.
can be a little trying on the clutch but i will replace the engine and clutch soon as its age and condition are unknown
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ardiesse
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« Reply #6 on: March 07, 2013, 09:59:16 AM » |
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For the EH and later diffs the rear uni joint is the same as the front.
Me too. I run a 3.36 diff in my sedan. Maybe a little slower off the mark. I don't have to slip the clutch any more than with a 3.89, but it's a far more relaxed cruise at highway speeds with a 3.36.
Rob
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Remember: if your Holden's not leaking oil, it doesn't have any.
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hsv-001
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« Reply #7 on: March 07, 2013, 12:45:24 PM » |
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Due to the lower tyre profiles to maintain highway speed at realistic rev.s and true speedo calibration a necessary evil
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newman
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« Reply #8 on: March 08, 2013, 07:12:25 PM » |
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Due to the lower tyre profiles to maintain highway speed at realistic rev.s and true speedo calibration a necessary evil
This link is always handy when changing diff centres / tyres etc. http://www.kabamus.com/garage/gears.htmlMick |
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MRJ68
Junior Member
Offline
Model: FE
Posts: 35
pie
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« Reply #9 on: March 25, 2013, 09:09:03 PM » |
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is the diff housing the same in the eh as the fe or do you cange the housing as well
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mcl1959
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« Reply #10 on: March 25, 2013, 09:16:07 PM » |
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Apart from a few subtle differences (bearings etc) the whole lot is an interchangeable unit. So diff centers can be interchanged.
However, for a better selection of wheel cylinder sizes to suit the front brakes it is better to use a HR rear end.
Then again if you are going SBC, maybe a Borg Warner or 9 inch would be better
Ken
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57effie
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« Reply #11 on: May 06, 2013, 09:05:47 PM » |
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Hey Ken,
I have been given an EJ. Very sad but it has a 149 that runs and some other bits I thought I'd scavenge. It has a Hydramatic in it. Is the diff ratio of the auto the same as the manual because I thought I might use it in Effie. What else might be worth scavenging ?
Cheers
Mark
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mcl1959
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« Reply #12 on: May 06, 2013, 09:22:57 PM » |
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Stock ej auto has the same diff as a manual, but have a look, it may have been changed....
Ken
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