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Old 01-21-2001, 04:54 AM
swinger340 swinger340 is offline
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Will a 74' alum. cased 4-speed overdrive trans. stay together with a near 400HP 340? i have 4.30 gears, how much would this hurt my 1/4 mile times vs. a "normal" 4-speed? I'm only 18 and am trying to convert my Swinger from a 318/auto. to a 340/4-speed. Thanks.
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Old 01-21-2001, 06:07 AM
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goose goose is offline
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From what I've heard the 3+1 tranny is not as strong as the regular 4spd, but a high-winding smallblock probably won't put out enough torque to cause any serious problems. The trouble with a hot 340 is that it'll probably need the closer ratios of a 4spd because it'll be peakier than a lower RPM engine; you will probably not be quite as fast with the 3 speed. The 3+1 is actually a regular A-833 4spd with the gear ratios changed around... what used to be "4th" was re-labeled "3rd" in the overdrive tranny, but wasn't changed in ratio at all (it's still direct drive). What used to be "3rd" was changed to a ratio less than 1:1 so that it was officially an overdrive. I'm pretty sure that 2nd in the 3+1 is different from 2nd in a regular 4spd, since shifting 1-2-3 in the 3+1 is like going 1-2-4 in the normal tranny, there'd be a hell of a drop in RPM if 2nd wasn't a different ratio in the two trannys. Anyways, the whole point of this is that the gears aren't close enough together in the 3+1 to be really effective in your application. However, since the 3+1 and the 4spd are the same basic tranny, you could probably do some parts switching and end up with an aluminum-cased close-ratio 4spd which would be cool.

Hope this helps!
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Old 01-22-2001, 01:06 AM
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dschumers dschumers is offline
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The only thing I've seen bad about the OD's is that when you are driving in 4th gear, the power is going through the cluster gear because you are really in 3rd. This can lead to bearing problems. I have some friends who run the OD's, and all have had bearing problems, but it took quite a while. Dennis
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Old 01-22-2001, 01:45 AM
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rumblefish360 rumblefish360 is offline
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As dschumers had said, its a lil weird in there. 400hp is a bit stout for the way it appears to be set up.
It will make for an interesting street tranny though.
1st gear is steep at 3.09. This makes for good get up & go!
The Overdrive is 0.73...4.30 X 0.73 = 3.139
Nice crusing ratio.
The 2nd gear ratio is 1.67. Thats a big jump from 1 to 2. If you can get it changed to 1.92 ('74-'75 OD Trans or a 1.91 froma '70 and earlier 4spd) instead, this would help that "gap" you would feel.

[This message has been edited by rumblefish360 (edited January 21, 2001).]
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