Joe,
The Mk IV had a 4.11 ratio... and the big flange input and stub axles.
There is a distinct difference between the early (small flange) and late
diff's. The input (pinion) shaft is approx 1/8" larger on the later diffs
(visual estimation... from memory late on a Friday night etc etc etc). The
stub axles are also different, early stubs will spin freely in a late diff
carrier without engaging.
Since all year Spitfires (and GT6s) used the same u-joints, it's all a
matter of figuring what flanges are on the diff and matching flanges on the
prop shaft and axles.
So, back to your question. No, you can't fit the early pinion in the late
casing (unless you do something like sleeve the pinion shaft or fit a
different bearing).
The early ring may fit on a late carrier (or TR7 4 speed carrier, they're
stronger). And that carrier may fit in an early casing... if it works let
us all know! :-)
Cheers,
Jim
> -----Original Message-----
> From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net]On
> Behalf Of Joe Curry
> Sent: Friday, January 19, 2001 3:42 PM
> To: Friends of Triumph
> Subject: Spit Diff question
>
>
> I am hoping someone has broad enough knowledge of early and late
> Spit and GT6 differentials me sort out something.
>
> John Kipping told me that he had various gear sets available when
> I spoke to him about Quaife carriers. Among the variety was a 4.11
> gear set. So I ordered one along with the Quaife unit. Both
> arrived yesterday.
>
> Here I am inspecting what I have and noticed that the ring and
> pinion gears looked very familiar. So I rummaged through some parts I
> took out of a Herald differential and compared them with what I
> received. Guess what???? They are identical.
>
> The question is: Will the early Spit/Herald gears fit into the
> later pumpkin that is required for the Quaife unit?
>
> I already fit the ring gear onto the carrier and it fits
> perfectly. But I have not yet received the case Brian Schlorff
> shipped me to
> see it the pinion fits properly. I looked at all my parts lists
> and cannot find a 4.11 gear set for any later diff, and all the
> bearings are different part numbers. So I am stumped.
>
> What do you say? Did I buy this unnecessarily? And more
> importantly, do I have 2 sets that won't work?
>
> Thanks in advance,
> Joe
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