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Diff Ratio Identification Diff Ratio Identification
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Old 7th July 2005, 03:15   #1
Infinicar
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Diff Ratio Identification
I have a couple of US customers who wants me to identify the ratio of the M5 diffs we have in stock.

I have had a quick look and can not see anything that resembles a ratio.

Anybody help?

Thanks
Paul
www.infinicar.com
Breaking 2 x 3.8 E34 M5
Last edited by Infinicar; 7th July 2005 at 03:16.
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Old 7th July 2005, 11:07   #2
DrSakke
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Re: Diff Ratio Identification
Quote:
Originally Posted by Infinicar
I have a couple of US customers who wants me to identify the ratio of the M5 diffs we have in stock.

I have had a quick look and can not see anything that resembles a ratio.

Anybody help?

Thanks
Paul
www.infinicar.com
Breaking 2 x 3.8 E34 M5
Hi!!
There should be a part number on the diff, maybe the ratio is possible to check with that?
Of course it`s always possible to count the ratio by turning the driveshaft connector (???) and checking how many turns it takes to turn the outgoing thingys (ie. wheels)


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Old 7th July 2005, 11:21   #3
farrell
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Re: Diff Ratio Identification
Quote:
Originally Posted by Infinicar
I have a couple of US customers who wants me to identify the ratio of the M5 diffs we have in stock.

I have had a quick look and can not see anything that resembles a ratio.

Anybody help?

Thanks
Paul
www.infinicar.com
Breaking 2 x 3.8 E34 M5
Paul
No marking will be on the hypoid casing. Std housing to suit various crown wheel & pinion ratios.

Apart from identifying the date of vehicle manufacture / vin no & therefore the ratio, the only other way is to measure the ratio yourself

Take one piece of chalk & mark the input flange (pinion) at 12 oclock.

Now mark the output flange at 12 oclock or insert a halfshaft & mark that.

Somehow, you will need to secure the hypoid on a bench or someone must hold it down

Using a tool to turn on the output end, turn the output flange one turn.
Someone with you can count the number of each turn the input flange makes, then using a dial gauge measure the percentage of the last turn the input flange makes, ie .68 or .72 of a complete input flange turn.

That wil be the ratio of the pinion & crownwheel.

Thats all I can think of.

Regards
Farrell
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