Barry,
Are you sure about the 3.63 ratio? I wasn't aware that the 3.63 was used in
the US Spitfires at all. All the documentation I've ever seen shows either
4.11 or 3.89 in the Spits.
BillG
OKC
-----Original Message-----
From: spitfires-bounces@autox.team.net
[mailto:spitfires-bounces@autox.team.net] On Behalf Of v6spitfireguy@cox.net
Sent: Friday, January 09, 2009 7:21 AM
To: red_tr250@yahoo.com
Cc: spitfires@autox.team.net
Subject: Re: [Spits] 79 Differential in a GT6
Todd -
Short answer is yes, you will need to change the back half if you want to
use the fixed spring. Not a major job, remove the stub axles by removing
the 4 allen head screws retaining the plates. Remove the plates and axles,
remove all the bolts holding the pumpkin on, pop the back off, replace
(reverse order of removal) with new gasket, smear a little sealant on the
stub axle retaining flanges, (no gaskets were ever used here) bolt them
back on and your set. Everything should bolt right up - the only "problem"
is that it is probably a 3.63 ratio - 76 and later Spitfires had this ratio
- so the speedo would be off - and you wont have quite the torque as you
would with the 3.89 ratio that stock GT6's with overdrives had, but a tad
more than the stock GT6 without overdrive, which used the 3.27 gears (at
least on this side of the pond)- Over in England they all had 3.27 ration -
can only imagine how tall the gearing with the overdrive engaged would be -
But on the bright side, the diff will be a bit more robust because it has
the stronger carrier -
Barry Schwartz
Original Message:
-----------------
I've sourced a '79 Spitfire diff for my GT6. I have
not received it & probably won't for a several weeks.
But it's cold & I'm in no rush at this point.
My question is the 79 a direct bolt in replacement for
a GT6 MK1? Meaning are there 6 stud holes(on top) on
the later diffs or only 4. If there are only 4, do I
need to use the back half of the GT6 punkin'? Not
done this before so please be gentle :)
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