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Old 11-15-2004, 14:22   #1 (permalink)
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Question Borgie Diff internal swaps

Hi all!

About to commence a full freshen up of my XC ute.
Will be running black 351 Clevo on straight gas ( Impco )
and FMX auto, all fairly stock including exhaust, gas cam etc.

My dilemma is I have two diffs, original 3.23:1 single wheeler
drum brake, and an LSD disk brake 2.75:1 ( I believe? )
out of a XD wagon which came with the motor and box.

Nothing is fitted up as yet as I want to do a trial fit before
everything gets freshened up.

My questions are: 1) what effect would each ratio have?
( will be just cruising and HWY miles )
2)can the brakes be swapped over?
3)can the internals be swapped incl the LSD ?

Yes, money is always tight and the car will be a toy, not a
daily driver. Any guidance and/or alternatives would be great.
Thanks for taking the time.
Will.
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Old 11-15-2004, 15:41   #2 (permalink)
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Re: Borgie Diff internal swaps

If you are running a manual a 2.75 will be pretty hard on clutches. 2.92 with a 4 speed will give 2500 RPM @ 100KM/H 3.23 will give approx 2800RPM @100 Km/h.
Having said that if its all highway K's you are doing clutch wear shouldnt be too much of a problem.
2.75 diffs have different centres to 2.92 and lower ratios so you need to swap he whole centre, you can't swap the ratios on the centre without making up spacers for te crownwheel etc. There are a few threads on this, do a search.
I've got a 3.5:1 , 2.92:1LSD and a 2.92 4 pinion single wheeler, I went to a diff shop and they said that they can build me anything I want from the 3 diffs for about $600.00 fully reconditioned so it is worth shopping around for a diff place that knows what they are doing. Not all housings are the same and centres come in 25 and 28 spline versions.
Regards,
tote
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Old 11-16-2004, 03:05   #3 (permalink)
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Re: Borgie Diff internal swaps

Everything Tote said is correct and if anyone is reading this I am on the lookout for a 3.23 LSD centre, 4 pinion, 25 spline, so I can get rid of the mini-spool I currently have :)
Regards,
Bully
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Old 11-16-2004, 14:33   #4 (permalink)
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Re: Borgie Diff internal swaps

Thanks for the replies.
The car will be running an auto (FMX).
Tote, I took your advice and called a diff mob in Melton.
He too said he could build me anything out of the two diffs
for $600 + with new bearings etc.
I'll be taking both diffs to the shop in the next week or two
and will post the outcome. Thanks again, Will.
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