Tony,
You've got it backwards... One tire rotation should be either 3.7 or 4.1
fan rotations...
Otherwise the pinion would need to be about 2' in diameter!
Jim
> -----Original Message-----
> From: Tony Rhodes [SMTP:ARhodes@compuserve.com]
> Sent: Tuesday, March 09, 1999 1:51 PM
> To: Charlie; Triumph List
> Subject: Re: Survey: who has 3.7 or 4.1 differentials
>
>
> Message text written by "Charlie"
> >I forgot how to check. Also, where on the axle would it be marked BTC ?<
>
> The serial number on the differential will read the number. It is in a
> pretty
> obvious location from under the car., if you can see it. In the edge of
> the
> differential case at the junction with the rear cover.
>
> You can test by rolling the car foreward in 4th gear for one full fan
> rotation.
> Having marked the tire, you see if it rolled less than 4 turns (3.7) or
> just more
> than 4 (4.1)
>
> -Tony
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