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Old 03-30-2004, 15:32   #1 (permalink)
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What Diff for XW/XY??

Hi I was wondering if someone could reccomend the best diff ratio for XW/XY model with a 351 and c4 auto in it.

I want something that fries em up when you want to but still has a reasonable top speed and fuel economy.

My brother just fitted 3.7:1 to his VK commodore, it lights em up but his at max speed around 170/180 and to top it off it is reving pretty high just at normal speed of like 120km/h which means quite thirsty.

Anyway hope you can help

thanks guys

Last edited by all4ford; 03-30-2004 at 16:27.
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Old 03-30-2004, 18:40   #2 (permalink)
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Re: What Diff for XW/XY??

Mild engine and a 3.54 diff will do nicely. Won't hit hard on the hip pocket for fuel either if tuned right.

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Old 03-30-2004, 21:39   #3 (permalink)
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Re: What Diff for XW/XY??

Sometimes the higher ratios can help fuel economy on the highway because they require less throttle to maintain a given speed, especially if you encounter alot of hills.
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Old 03-31-2004, 03:06   #4 (permalink)
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Re: What Diff for XW/XY??

What model diff it is,is it a 9inch or BW, I'd say 3.50 ratio.
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Old 03-31-2004, 04:22   #5 (permalink)
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Re: What Diff for XW/XY??

9 inch for sure, is there a 3:45 diff????????
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Old 03-31-2004, 07:30   #6 (permalink)
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Re: What Diff for XW/XY??

9" doesnt have 3.45, however it has a 3.5:1 ratio which would be a good compromise gearset
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Old 03-31-2004, 16:11   #7 (permalink)
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Re: What Diff for XW/XY??

Quote:
Originally Posted by Walkinshaw
9" doesnt have 3.45, however it has a 3.5:1 ratio which would be a good compromise gearset
Sounds good thanks for all your help everyone, now i have to go find one, shouldn't be to hard hopefully.
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