Help needed: Question on diff bearings

Non-engine, eg: aerodynamics, gearboxes, brakes, suspension
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TR-Spider
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Joined: June 23rd, 2006, 8:37 am
Location: Rekingen / Switzerland
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Help needed: Question on diff bearings

Post by TR-Spider »

I could need some help on a question regarding tapered (conical) roller bearings.

The background: I am currently building up a new (live) back axle for my Fiat 124. I will use a late 132 axle and want to put a LSD in.
The LSD is a ZF unit from a 6-zylinder BMW, which will be upgraded to 45% lock.

The problem is with the bearings carrying the diff (see scetch).
The Fiat size is 72mm OD, 39mm ID 21mm height.
The ZF size is 75mm OD, 46mm ID, 18mm height.

I do not want mill the ZF diff casing down to 39mm, in order not to loose the structural strength (inside diameter of the casing is larger than the Fiat one).

So ideally I am looking for a tapered roller bearing
with 72mm OD and 46mm ID 18-21mm height...which does not exist.

I searched SKF, FAG, Timken.

The closest I found was 73mm OD and 44.45mm ID 18.25 mm height, which would be sufficient in strength from it's loadnumbers and for the ZF diff casing.

The big question is now: is it possible to grind down the outer shell from 73mm to 72mm? (assuming a professional workshop operation etc).
Will that weaken the bearing?

Has anybody faces a similar problem and done this before?
Does anybody know a place to get tailored bearings?

Thanks,
Thomas
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