scuttlebutt3
New Member
I have 1973 dodge challenger with a 440 magnum and a 727trans,with a 293ratio.is this a good setup for highway driving.i hope someone can help me with this concern.orginally came with a 340 engine from the factory.
Ring gear and pinion 1973 dodge challenger.
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moparlvr166
Well-Known Member
Need more info, how tall of rear tire, stock 440, manifolds intake and exhaust, any cam changes?
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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the 2.94s are an awesome hiway ratio;
with 27" tires 65=2380rpm @ zeroslip, say 2 or 3 percent higher for convertor slip. and
60mph at WOT, at the top of First gear is ~5900@10% slip.
Thus; 30mph is about 2950 in First@WOT, not too bad;
but only 1600 in Second and cruising, so if the convertor stalls around 2000, you might want to up that a tad, it will depend on what yur expecting, performance-wise.
To get fuel economy in the range of 65>75 mph, yur gonna have to figure out how to give the 440 the ignition timing it wants, which is just doable, and you'll probably want to keep the stall short.
That BB combo is just itching for a Lock-up/overdrive, and something like 4.10s and 28s; then she'd fly.
with 27" tires 65=2380rpm @ zeroslip, say 2 or 3 percent higher for convertor slip. and
60mph at WOT, at the top of First gear is ~5900@10% slip.
Thus; 30mph is about 2950 in First@WOT, not too bad;
but only 1600 in Second and cruising, so if the convertor stalls around 2000, you might want to up that a tad, it will depend on what yur expecting, performance-wise.
To get fuel economy in the range of 65>75 mph, yur gonna have to figure out how to give the 440 the ignition timing it wants, which is just doable, and you'll probably want to keep the stall short.
That BB combo is just itching for a Lock-up/overdrive, and something like 4.10s and 28s; then she'd fly.
scuttlebutt3
New Member
3.23 is probably what it has in it. No problem with a big block.
scuttlebutt3
New Member
Tire size,rear p25560r15,440 as far as i know is stock,no cam changes,new exhaust system and intakes appear to be factory original.im not into track racing or burning up my tires,just want drive local and some highway max 80 miles one way.
I run 3.23's in both my cars with 255-60/15's and get good mileage and decent acceleration. One is a 273-4 barrel and the other is a 318- 2 barrel. That 440 has some torque to get you off the line and doesn't need to be revved to the moon to make power.
scuttlebutt3
New Member
The 440 has enough power for me. I have really enjoyed getting this challenger.changed out the edelbrock 4bbl,replaced it with a holley four bbl.
moparlvr166
Well-Known Member
What you have will work fine, for me I like the 3.23 I don't think you would notice much fuel milage difference at freeway speeds unless you at unlawful speeds.
I havec2.93 in my dart with 273 and 215 70 14 tires.
70 to 80 on the interstate is no strain
No tach, but it doesn't sound like it is racing.
70 to 80 on the interstate is no strain
No tach, but it doesn't sound like it is racing.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
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by the math, 75=2860rpm@zero-slip. With an automatic, could be up to 3>4% higher at that speed so maybe ~2950
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