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#2
05-21-2009, 02:30 AM
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Re: 95 caprice rear diff
The 3.23 will offer better acceleration and responsiveness at the expense of top speed and fuel economy.
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have. 
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#3
05-21-2009, 09:50 PM
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Re: 95 caprice rear diff
You are only half right. 3.23s will actually INCREASE top speed because these cars in stock form are wind resistance limited before the engine is up to peak power rpm. By letting the engine get closer to peak power rpm you can actually go FASTER with even say 3.42.
3.73s would be close to limiting top speed based on rpm rather than air resistance. Basically to hurt to-p speed you would have to go to 3.90-4.10 or beyond. Let's put this in perspective a little 5000rpms in OD with 3.08s would be over 180mph do you honestly think the engine has the power for that??? Reality is the wind stops acceleration usually 145-150mph at which point the engine is little over 4000rpms, well below peak HP number. Something like 3.42 lets the engine reach closer to peak HP
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96 Caprice Medium Garnet Red 11.56 at 115.9mph naturally aspirated 94 Caprice wagon, rotted out POS
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#4
05-21-2009, 09:59 PM
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Re: 95 caprice rear diff
^^ Well said.
If the car has an overdrive 4 speed transmission, the 3:23 is the better choice. The 3:08 is only beneficial for a slight gain in fuel economy. It's worse for all other considerations. FWIW I only prefer 3:08 or taller rear ends in cars which have old 3 speed auto transmission.
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#6
05-22-2009, 09:25 PM
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Re: 95 caprice rear diff
Personally I like 3.42 for a mileage car. Did just as well as the 2.93s it came with or the 2.56s in the wagon, actually for normal rural and in town driving the 3.42s are better mileage than the 2.56s. Whomever decided 2.56s in a 4500lbs+ car with OD and lockup was a good idea needs a swift kick in the seat.
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96 Caprice Medium Garnet Red 11.56 at 115.9mph naturally aspirated 94 Caprice wagon, rotted out POS
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