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Stock48 Lq4/GT76 finally hits the dyno...

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Old 10-17-2012, 10:31 PM
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Interesting...I wouldnt mind changing to some 3.23s...
Old 10-18-2012, 10:43 AM
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14 bolt is going to be the killer for you. The highest gear ratio available that I know for a 14 bolt is 3.42. The good news is you ought to be able to pick up a front and rear set for cheap from one of the gmt900 truck guys going to 4.10s.
Old 10-18-2012, 10:49 AM
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break out the grinder and make some gears.....................ok maybe not..

what are you running now Atomic?
3.73s?
Old 10-18-2012, 11:19 AM
  #84  
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No they offer down to 3.23...I know at least yukon makes a set. I have 3.73s right now.
Old 10-18-2012, 11:30 AM
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i bet that would be crazy with 3.23s...
Old 10-18-2012, 12:34 PM
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Actually you can get like a 3.23 as mentioned but I believe there was a factory 3.08 or 2.93 available in the old caddy that you could use.

There was a Caddy that used the 9.5 in the mid 90's
Old 10-18-2012, 02:18 PM
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I'd settle for someone making a 4.30 set for a 14 bolt. I don't think 4.10s will be enough and 4.56 are going to be a little steep for unloaded highway driving.
Old 10-18-2012, 02:27 PM
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Originally Posted by 1slow01Z71
I'd settle for someone making a 4.30 set for a 14 bolt. I don't think 4.10s will be enough and 4.56 are going to be a little steep for unloaded highway driving.
the difference between teh 4.10 and 4.56 isnt much RPM wise..
Old 10-18-2012, 03:22 PM
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I know, but it doesn't take much rpm to kill a mpg or two. My truck is such a bad combo right now that at 70 I can shift from OD to third and my mpg stays the same

I've got a set of 4.10s and plan on buying a set of 4.56s to try and see which ones work better for me before I regear the front diff.
Old 10-18-2012, 03:32 PM
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200 more rpm will prolly help with them heavy tires and no aerodynamics..


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