Differential Identification

[Nick Jackson (2)]

I have two diff's for the GT6 but don't know whether they are 3.27 or 3.89 types.  Does anyone know what identifying marks are on them to tell which is which?   There doesn't seem to be any colour codes like the Big Saloon types.

Thanks
Nick

[smithy]

Nick - turn the front and count the rotations. If you've got a 3.27, slip it in the post to me.  :)

[Deleted User]

smithy wrote:

Nick - turn the front and count the rotations. If you've got a 3.27, slip it in the post to me.  :)

get in the queue   ;D

[Nick Jackson (2)]

Both diff's are awaiting fitting to my restoration project and I'm trying to work out what I've got!   I'm told by former owners I have a 3.27 and a 3.89 but before fitting I need to check somehow.  

Updated:-

Can I do this off the car then?

[Nick Jones]

Nick,

This may help a bit.

http://www.canleyclassics.com/?xhtml=xhtml/infodatabase/diff.html&xsl=infodatabase.xsl

Yours will be in the last group and I'd think that GT6 ones will be KC (3.89:1?) and KD (3.27:1?)  The original markings are a slightly high risk ID method, partly because my remarks above are guesses and partly because they may have been rebuilt at least once since they left the factory and may have changed ratios in the process.  Counting turns is the safe way.

Cheers

Nick

[herald948]

Nick_Jones wrote:

This may help a bit.

http://www.canleyclassics.com/?xhtml=xhtml/infodatabase/diff.html&xsl=infodatabase.xsl

Yours will be in the last group and I'd think that GT6 ones will be KC (3.89:1?) and KD (3.27:1?)  The original markings are a slightly high risk ID method...Counting turns is the safe way.

Nick, I think it's the other way 'round? KC = 3.27 and KD = 3.89:1.

[Sorry, link no longer available]
Regardless, I agree...40+ years on, a lot could've changed!  ;D

[smithy]

Nick - counting the turns can be done on or off the car. Off the car's easiest, you don't need to get the wheels in the air.
(I refuse to believe your car has two differentials fitted to it anyway - one of them at least MUST be easy to count-the-turns on).
Rob - my post is the first in the queue!  :K)

[John Bonnett]

Tavistock Steve's got a 3.27 on Ebay

http://www.ebay.co.uk/itm/TRIUMPH-SPITFIRE-GT6-VITESSE-3-27-DIFFERENTIAL-RARE-/130676698218?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item1e6cf02c6a

[Nick Jackson (2)]

Right, so I've now found out I've definitely got a 3.27 and a 3.89.   So it's going to be a 3.27 fitted with the 2.5 engine and J type overdrive, which was the original fitment when I bought the car in 2006. I've no idea how that lot works together but I know a good way to find out ;-)

Thanks to all.

Nick