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Old 10-16-2009, 10:34 PM
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4:11 gears are pain in the "rear end"

I have been debating whether or not to get rid of my 4:11 gears but would like to hear some suggestions.

I have a BBC in my Chevelle, coupled to a TH350, which is connected to a 12 bolt posi with 4:11 gears. I have upper and lower tubular control arms as well as a pair of drag bags in the springs. A set of drag radials keeps it nicely stuck to the ground. Needless to say, the car will jerk a knot in your neck, but I have no intentions of taking it to the track. Mostly I cruise on the weekends and drive to car shows most every weekend.

I love the performance, but hate to get it on the highway due to the low gears. At 60 mph I am about 3200 rpm and it makes for an unpleasant drive.

Would I be better off to step up to something like a 3:73 or would I see about the same results?

I'm willing sacrifice a little of the performance for a better ride on the highway.

Any advice would be greatly appreciated.

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Old 10-16-2009, 11:47 PM
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i had a 69 GTO once that had 4.56 gears.i wished i would have put 3.55 or 3.70 in it as well. you could always go with a gear venders od unit.
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Old 10-17-2009, 12:26 AM
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The 3:50 or 3:73 are a good set for the street...
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Old 10-17-2009, 03:53 AM
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I installed a 200r-4 trans in a camaro in place of a th350.It was a pretty easy swap.
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Old 10-17-2009, 05:47 AM
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Taller tires can lower rear gearing.I have 4:11's in my car. I also have 33" tall tires in the rear. There is a formula for getting the true rear gearing with tire height and I used the formula and figured my true gearing is 3:92. Still high for the street but alittle better than 4:11. I don't have the formula at hand, I found it in an old hot rod book. I imagine you could find it by googling or ask.com.
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Old 10-17-2009, 10:40 AM
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A looser converter will take some of the initial jerkiness out of it, and/or an OD transmission. That or go to the 3.73 or 3.55. You've got the engine.
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Old 10-17-2009, 02:00 PM
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700 transmission will make your car a blast in town and on the highway. i just but the TCI units with the converters and have had zero problems with them, even behind 500hp big blocks.
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Old 10-17-2009, 07:01 PM
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Quote:
Originally Posted by renfroe453
I have been debating whether or not to get rid of my 4:11 gears but would like to hear some suggestions.

I have a BBC in my Chevelle, coupled to a TH350, which is connected to a 12 bolt posi with 4:11 gears. I have upper and lower tubular control arms as well as a pair of drag bags in the springs. A set of drag radials keeps it nicely stuck to the ground. Needless to say, the car will jerk a knot in your neck, but I have no intentions of taking it to the track. Mostly I cruise on the weekends and drive to car shows most every weekend.

I love the performance, but hate to get it on the highway due to the low gears. At 60 mph I am about 3200 rpm and it makes for an unpleasant drive.

Would I be better off to step up to something like a 3:73 or would I see about the same results?

I'm willing sacrifice a little of the performance for a better ride on the highway.

Any advice would be greatly appreciated.
I believe 373s came as a stock option, I know they did in 70.
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