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What Diff Ratio??

Old Dec 14, 2007 | 07:24 PM
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79351XLT
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Question What Diff Ratio??

Hi All!
I am swapping my 351 and manual in the 79 XLT (2 wheel drive short wheel base) for a 460 and C6, my main question is, can tell me the best Ratio to put behind the C6???
The truck does a fair share of highway miles and tows a car trailer with my Early Holdens on it, quite a bit
Cheers
Matt
 
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Old Dec 14, 2007 | 07:36 PM
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If it was me i'd stick with 3.54s if it's just mostly highway. What gears are in it now?
 
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Old Dec 14, 2007 | 07:40 PM
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I am not sure of the current ratio, and bucketing down at the minute so I will check when the storms clear.
would the 3.54's be good with towing as well?

The current diff ratio in the truck sits at 60mph @ 2500rpm (it has 31 inch tyres fitted) if that helps?

Cheers Matt
 
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Old Dec 14, 2007 | 07:47 PM
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Which 460 ?

How heavy a trailer ?

I do just fine with a 1970 429 (360 hp) C6 ......2.75 Ratio rear.

Higher RPM at cruising speed = More fuel consumption .

The post 73 460's only had 202 HP or so and just an adequate amount of TQ so 3.00's IMO would be better
 
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