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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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  #61  
Old 8th June 2018, 04:27 PM
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Oversize Oversize is offline
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Default Re: 6.9 Transmission Upgrade

The Aussie 560 uses a 2.47 final drive which is another reason why it's slower 0-100 than a Euro one.
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
78 6.9#4248 (Skye)
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
77 450L#067010-P
75 450L#028414 (Gold Nugget)-P
57 Buick 73A (Titanic)
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  #62  
Old 8th June 2018, 04:37 PM
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Default Re: 6.9 Transmission Upgrade

SEL 69L (David Rollason) had a 450 differential fitted to his 6.9 that he sold some while back. He did this on the advice of a friend of his, and obviously I did have opportunities to drive his car. To be perfectly frank, I really couldn't tell all that much difference despite that fact that David DID think it made his a more satisfying, and faster car, to drive. Personally, I still think that Gleaming Beauty had the legs on his car.

It is feasible that a 6.3 box could be used behind the 6.9 engine, but even though it is a four speeder, if one would utilize first gear, you would just about rip out the diff/rear axle arrangement - a very, very costly option on 6.3s and accompanied by heaps of work. This weakness in the 6.3 drivetrain is probably one of the reasons why the 6.3 needs special, loving and tender care. Plus, the box has two looped bands one of which is prone to let go, and another expensive repair option is on its way. I don't know - I think I'll stick to what I've got for the time being. Regards Styria
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  #63  
Old 8th June 2018, 04:46 PM
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Default Re: 6.9 Transmission Upgrade

Quote:
Originally Posted by Styria View Post
SEL 69L (David Rollason) had a 450 differential fitted to his 6.9 that he sold some while back. He did this on the advice of a friend of his, and obviously I did have opportunities to drive his car. To be perfectly frank, I really couldn't tell all that much difference despite that fact that David DID think it made his a more satisfying, and faster car, to drive. Personally, I still think that Gleaming Beauty had the legs on his car.
Was his car an aussie delivery? if I recall right, your GB is a high comp motor, so I could easily see a high comp motor being about the same as an aussie car with a 450 rear end???
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  #64  
Old 8th June 2018, 07:00 PM
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Default Re: 6.9 Transmission Upgrade

Hi Bryce, yes it is. I have always found ever so much, or perhaps so little, of a difference between the high and low compression engines. Seat of the pants and ears demonstrate an aural difference, as well as an ability for the high compression engine to "want to go on with it". Maybe I am barking up the wrong tree, but there just seems to be that little bit of a difference. Regards Styria
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