How hard/expensive is it to switch out gearing on an A-body?

Treblig said
I would much rather install a 2004R!! I'm running 4:56 gears and my car cruises at 2500 going 65/70 MPH (29" tires)....I love it. When I had 3:90 gears I could cruise at 70MPH doing 2100RPM with a top speed of 180!!!! Why spend money on switching gears when you can keep the gears and increase your gas mileage??
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treblig

Why put a Chevy trans in a mopar........ He has a 4 speed 340 car, not exactly found everywhere. And I'm guessing he likes the 833.

svevobandini said
Hey everyone, I've finally found a 4-speed Barracuda in my price range. However, it's a 340 with 3.91 gears. I don't spend much time on the freeway but I do like long drives on smaller roads. I'd like to be able to go 55-60 comfortably. How hard/costly would it be to switch to 3.55 or 3.23?

Assuming you have a 8.75 rear, not that bad at all, you can get an assembled center section and swap it in an afternoon fairly quick. plus you could sell the 3.91 center as is and pay for the swap for a 3.23 center section. Youre looking at anywhere from 50 bucks on up to 4-5 hundred bucks for the center sections depending on casting number, sure grip or open and ratio.