3.42 or 3.73 with th350? - Chevy Nova Forum
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Old 17th-May-2017, 10:04 PM   #1
copperbrown74
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3.42 or 3.73 with th350?

3,300 pound 74.
Sbc 350 with mild cam, vortec heads.
Th350 trans with 2400 stall converter
26" tires
Best posi rear end?
Most important thing to me is power off the line and when cruising at under 50.
Want good pairing with engine/trans/converter
Limited highway driving but don't want to blow up engine on highway.
Might change cam to slightly more aggressive one but not much and no other engine mods
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Old 18th-May-2017, 06:34 AM   #2
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DON'T KNOW ABOUT THE CONVERTER BUT WITH 3.42 AND 26" TIRES YOU SHOULD TURN ABOUT 3200 rpm ON THE HIGHWAY AT 70 MPH.
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Old 18th-May-2017, 06:42 AM   #3
epfatboy
 
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3.73 for sure. I run the same combo and would not change in either direction.

If you change the cam change the converter to 3600. You might want to change the converter before the cam since you'll get a noticeable seat of the pants power increase.


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Old 18th-May-2017, 09:19 PM   #4
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It will be 310 RPM at any given RPM with the 3.73 over 3.42 gears.
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Old 19th-May-2017, 10:03 AM   #5
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After 10 years of 3.73's, I went down to a 3.42 as I do a lot of highway/55 mph back road cruising. I don't think you can go wrong either way. The 3.73 is better from take off, the 3.42 is better on the open roads.

Based on your description, I'd lean towards the 3.73's.

Kev
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Old 19th-May-2017, 11:10 AM   #6
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Quote:
Originally Posted by copperbrown74 View Post
Most important thing to me is power off the line and when cruising at under 50.
Limited highway driving but don't want to blow up engine on highway.

Might change cam to slightly more aggressive one but not much and no other engine mods
If you plan to drive it mostly under 50 mph, go with the 3.73! The 3.42 would be more beneficial on the highway...

Do you know your cam specs? Some cams would be more preferential to the 3.73.
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Old 19th-May-2017, 03:05 PM   #7
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I'd go with 3.73 based on the info you provided on what you want from the car.
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Old 20th-May-2017, 12:30 PM   #8
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3300 seems a bit low for a 74. Is it a no power steering, no power brake strippo model?

My 69 weighed 3140 with a 6 cylinder/3 spd. manual trans, no options, no carpet, nothing! That was on a certified truck scale.
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