On 5 Dec 2009 at 16:32, Matthew Milkevitch wrote:
> This afternoon I removed the differential from my '77 Spitfire,
> for it was getting very noisy under load.
Sure it wasn't just a U-joint?
> I noticed that one of them is different than the rest. It has a
> drain plug on the bottom and it has 6 holes for the mounting studs.
> I'm assuming that this differential is from an early Spitfire.
I've never seen an early Spitfire diff so perhaps that's what it is.
But most likely it is from a GT6. The six studs is the clue. The
drain plug would have been added by a PO, not a bad thing.
> are all Spitfire differentials interchangeable?
As far as I know they are but, as you say, their ratios will be
different. You can measure various key dimensions to be sure. Check
the distance between the ears at the rear and their thickness. Check
the distance between the front mounts and how far forward they are
from the rear ears. Check the distance between the halfshaft u-joint
flanges. Finally, check the position of the driveshaft flange, how
far forward it is from the front mounts. I'm betting the diff with
six stud holes is positioned differently. And if their cases are
different you should see the differences easily.
One final test. When you've chosen your preference fill it with oil
to the bottom of the filler plug hole, put the plug in, and tilt it
forward. The front oil seal can leak, and you don't want to use one
that starts dripping as soon as you fill it.
--
Jim Muller
jimmuller@rcn.com
'80 Spitfire, '70 GT6+
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