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  1. #21
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    58
    Posts
    2,291
    Yes, numerically low is a high ratio diff.
    Cheers

    Myles D-W

  2. #22
    Join Date
    May 2004
    Location
    Finchampstead, Berkshire, UK.
    Age
    54
    Posts
    3,581
    Quote Originally Posted by aaronjb View Post
    2.88:1 with a 4 speed should be perfect.. I have a 2.88 with a 6 speed, I guess I'll find out if it's too low for 6th
    Pretty much yep! I went from a 3:31 to a 3:54 to make 6th a bit more useable! Currently spin the engine at about 2k @70Mph, the old diff was north of 80 for the same.
    Rgds
    Jim

  3. #23
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    41
    Posts
    3,873
    Quote Originally Posted by corn plaster View Post
    Isn't a 2.88 a high ratio?
    Yeah .. I meant numerically low, but high ratio would have been the better way of saying it You knew what I meant, though Probably a little high for 6th but we'll see, I have a fairly mild cam and should have a lot of bottom end torque..
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  4. #24
    Join Date
    Sep 2007
    Location
    Hilperton,Wiltshire
    Posts
    2,562
    People often get the ratios wrong,ie having a low number and then thinking the have a low ratio. The opposite in fact. You know what you meant. Maybe abit high for six gears. Sure you'll work something out. Good luck.

    Andy

  5. #25
    Join Date
    May 2014
    Location
    Birmingham
    Age
    42
    Posts
    719
    If anyone is after a powr-lok then look here :

    https://www.autoreservejaguar.com/ja...ck-3-27-1.html

    This is exactly the same as my 3.27:1 diff.

    Alan.
    AK Gen II delivery date Oct '15
    IVA pass Dec '18.
    On the road Jan '19
    GM LQ4 364ci, LS9 cam, Omex 710.
    Tremec T56 Terminator.

  6. #26
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    41
    Posts
    3,873
    Why, Alan. Why would you post that link.

    Now I'm re-running the calcs for a 3.27:1 diff and wondering if I should pony up the £400.

    My last Powerlok diff cost me £50 before the rebuild..
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  7. #27
    Join Date
    May 2014
    Location
    Birmingham
    Age
    42
    Posts
    719
    Like Aaron, your welcome!

    Alan.

    What ratio is your current LSD then, surly it has a resale value?
    AK Gen II delivery date Oct '15
    IVA pass Dec '18.
    On the road Jan '19
    GM LQ4 364ci, LS9 cam, Omex 710.
    Tremec T56 Terminator.

  8. #28
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    41
    Posts
    3,873
    I had 2.88 (XJ6 diff) internals put into an XJ40 case by Russel Ram back when I started building; it is a very long ratio diff for a 6-speed with an 0.63 6th, 70mph should be about ~1600rpm. 3.27 would make it 1800rpm.
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  9. #29
    Join Date
    May 2014
    Location
    Birmingham
    Age
    42
    Posts
    719

    Nearly there . . .

    So I'm half way through this and am now slightly confused, looking for some advise please.

    I have a Sailsbury GKN 14hu (Dana/Spicer 60) this unit has six powr-lok plates, all the kits 44-80 either have 10 (5 each side) or more than 6.

    I think its because i have a "end plate" with a clear oil routing mark rather than the "clutch ring" on the diagram.

    I also have all flat plates no dished ones apart from the end plate?

    Just looking for confirmation as to re-ordering them to de-rate to the 3 plate system thus reducing the torque by 40% for a light Cobra.

    Thanks in advance,

    Alan.
    Attached Images Attached Images
    AK Gen II delivery date Oct '15
    IVA pass Dec '18.
    On the road Jan '19
    GM LQ4 364ci, LS9 cam, Omex 710.
    Tremec T56 Terminator.

  10. #30
    Join Date
    Aug 2011
    Location
    Birmingham
    Posts
    345
    That image isnt a picture of the inside of a Jag 4HU unit. Download the relevant parts manual from SNG or Manners to see what yours looks like.

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