The early Spit Differentials as well as the Herald ones have 6 mounting
studs because they have a clamping plate on top of the spring instead of
that ridiculous rocker box which can only use 4 studs. The Rotoflex diffs
also have 6 studs.
The Herald and other early diffs have a drain plug at the bottom. This was
eliminated in later ones I assume to save a couple of bucks. Some
industrious lads have tapped that boss and added a plug (a good idea in my
opinion.
The main difference in diffs that fit Spitfires in the size of the input and
output flanges. The early ones and Herald diffs have a smaller flange. The
later ones have the same size flange as the GT6 uses.
If you have a diff with 6 studs and larger flanges it is most likely from a
GT6. To be sure you can check the serial number.
If it begins with FC, It came from a round tail Spit.
Of it has FH, it is a later Spit.
If it starts with the latter G, it is from a Herald.
If it starts with the letter K, it is from a GT6.
Joe
-----Original Message-----
From: spitfires-bounces@autox.team.net
[mailto:spitfires-bounces@autox.team.net] On Behalf Of Jim Muller
Sent: Saturday, December 05, 2009 8:57 PM
To: spitfires@autox.team.net
Subject: Re: [Spits] Spitfire Differentials
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?
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