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Old 04-11-2007, 02:14 AM
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Agreed. Since its a street car, I'd go no more than 2400. Without knowing all the cam stats its tough to guess, but I would shoot for a rear end ratio that gets you the target cruise RPM you want. As Ozz1967 said, you'll have TONS of torque available. My 400-horse 454 has a TH400 in a very heavy 73 Impala Station Wagon with huge 255/70-15 balloons and I'm running a stock converter that stalls at about 1800 with 2.73 rear gears. I left things alone and I thought for sure I'd be changing them out, but three years later its still like it is. I'd be happier with 3.08 or 3.23s, but the ability to cruise at 75 mph all day at 2400 rpm and still haul ***** from a dead stop is pretty nice so I left it alone. If I do anything I'll throw in my Gear Vendors that's been gathering dust and then go with 3.42s, but the stock converter is working great. My cam specs are 218/224 @ 50

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Old 04-11-2007, 07:47 AM
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curtis i agree.

gearing in a race car is a necessary evil. i know too many people who were so unhappy with a 4 series RP swap. in the end their cars sat, or girlfriends made them sell. to really take advantage on the streets you need an OD trans.
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Old 04-11-2007, 08:09 AM
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I used to run 4.11 with a 28" tall tire in my Chevelle with a 396. It was loads of fun and ran great. The freeway sucked though. I would most likely go with the 3.55. The lower gears will make your convertor stall less. The problem you are having with your convertor is because you have a cheap one. A good quality convertor will not stall high unless it is flashed up there. I have a 6000 stall convertor and I can cruise it around with no problems. When I leave a stop light, it doesn't stall past 2500rpm.
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Old 04-24-2007, 05:24 PM
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re: What rear end gear ratio to choose?

To all that have participated in this discussion, I really appreciate the advice! At this point, I believe I'm going to keep the B&M 2400 stall converter I got (I don't know if this is considered a cheap converter or not?), hook a beefed up TH400 up to it ('cuz I got a good deal on one) and test drive my friend's '67 Chevelle (stock 396, TH400 & 3.73 posi) to see how that drive train feels. If that feels fun on the street and manageable on the freeway, I'll consider installing a 3.73. If that doesn't feel right, it looks like the advice from this conversation has tended to lean toward something in the range of 3.42 to 3.55 as being more "reasonable" for a street car, which I find eminently logical.
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