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Old 03-31-2014, 11:49 AM   #1
Dexter007
 
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Default Which gears?

I'm about to order some gears and I need a little help. Right now the car has 2:73 gears. If I go to 4:10 will that make it wind out on the highway or should I stick with 3:73?
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Old 03-31-2014, 11:53 AM   #2
dawson1112
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3.73 manual trans,,,

4.10 auto trans
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Old 03-31-2014, 01:36 PM   #3
mjr46
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4.10's will be fine, hardly any difference between 3.73 vs 4.10 rpm wise if you plan to race it, don't fear the gear
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Old 03-31-2014, 01:58 PM   #4
Roger Mabry
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Default What will car be used for?

Any higher numbered gears will cause higher rpms on the highway... the higher (larger numbers) the gears the more rpms to go 65 mph.

Tires size will also influence the rpms... larger diameter is less rpm at 65 ...
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Old 03-31-2014, 05:17 PM   #5
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Originally Posted by dawson1112 View Post
3.73 manual trans,,, 4.10 auto trans
that's the answer I was looking for thank you
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Old 03-31-2014, 06:49 PM   #6
Roger Mabry
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Default What you received was an "opinion"

Check out this calculator and figure it out using 3.73 and 4.10 -
I would start with your current 2.73's to prove the rpm you are seeing now.

http://www.ringpinion.com/Calculators/Calc_RPM.aspx

With stock sized 15" tires the diameter is 27.4:

2.73 at 65 mph is 1523 rpm
3.73 at 65 mph is 2081 rpm
4.10 at 65 mph is 2288 rpm

Unless you are going be "racing" this car - you will notice lower fuel mileage,
higher noise from the engine

I like my 2.73's as these little 302 HO's are not race cars, just nice drivers.

Having had gears up as high as 5.12 on the street with no OD, I do not like
the high cruising rpms - maybe with a six speed and a OD of .50 or so.....

Cruising around 2000 rpm is OK.... or 3.73's max = my "opinion"
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Old 03-31-2014, 10:23 PM   #7
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Quote:
Originally Posted by Dexter007 View Post
that's the answer I was looking for thank you
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Old 04-01-2014, 08:52 AM   #8
Roger Mabry
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Default Simulate each of the gears

Just drive the car in/out of OD, run it to 65 at each of the "new rpms" and
you can see what the car will sound like....
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Old 04-01-2014, 10:10 AM   #9
88 orangepeel notch
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I liked your answer mjr lol

I love these gear threads, just as much as I love my 3:55's, they're the best.

Last edited by 88 orangepeel notch; 04-01-2014 at 10:12 AM.
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Old 04-04-2014, 06:30 AM   #10
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3.55's or 3.73's sound good for daily driver ?
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Old 04-04-2014, 06:30 AM
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