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Thread: Is it the same gearbox for a NA and SC?

  1. #1
    Junior Member
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    Is it the same gearbox for a NA and SC?

    I got offered a gearbox for cheap money but it's from a NA not a SC.

    Though I'm tempted I've no reason other than to have a spare but it did get me wondering if they were different? And why? Other than the more power of the SC!

  2. #2
    Senior Member
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    You don't mention whether you have a 4.2 or 5 litre but it looks like you have a 4.2 based on your previous posts.

    There are actually different for both types but this is what the workshop manual for the 4.2 says:

    On supercharged models, the transmission used is an uprated derivative of the 6HP26 transmission used in the 4.2L
    naturally aspirated model. The uprated transmission includes additional clutch plates to enable the transmission to
    manage the additional power output of the supercharged engine.
    Current Jag: 2010 5.0 XKR (XKR-S X-Pipe, smaller S/C pulley and Tune ~650bhp - 11.567@123.19, max v=126.04!)

    Previous Jags: 2007 4.2 XKR | 2004 4.2 XJ8 | 1998 4.0 XJR | 1996 6.0 XJ12 | 1989 5.3 XJ-S | 1983 5.3 XJ-S | 1980 5.3 XJ-S

  3. #3
    Senior Member MarkyM's Avatar
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    The key message here is ADD YOUR ENGINE SIZE AND MY TO YOUR SIGNATURE TO STOP PEOPLE HAVING TO SEARCH YOUR PREVIOUS POSTS OR YOUR 'ABOUT ME'

    Shouting and rant over
    2014 XK Dynamic R Coupe (no backbox, supercharger pulley upgrade and K&N's)
    Peugeot 2008 EAT6 with pan roof and heated seats - new addition

  4. #4
    Senior Member
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    I can tell you the part number is different.
    2007 S type R, Radiance Red/ Champagne

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