4.10's or 4.30? - TCCoA Forums
 
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post #1 of 19 (permalink) Old 02-02-2015, 03:55 PM Thread Starter
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4.10's or 4.30?

I'm having an awfully hard time deciding between 4.10 or 4.30 gears. Car will be daily driven and see track time a few times a month. Not too worried about gas mileage. Are 4.30s too much?

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post #2 of 19 (permalink) Old 02-02-2015, 04:24 PM
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If it will be daily driven, 4.10s would be the absolute max I would go, and honestly I would consider stepping back to 3.73s, especially if you do any highway driving at all. Before doing any gear swap, drive around with OD locked out for a few days. That will give you similar cruising rpms as 4.10s.

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post #3 of 19 (permalink) Old 02-02-2015, 05:36 PM
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I have 4.10 gears still in the box I've been meaning to install in my car. From my research 4.10's is pretty ideal for street driving. 4.30's may be a bit much for a daily driver. It would be a good idea to put in an aluminum driveshaft and rear lube mod on the trans when you go into the 4's for gears.

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post #4 of 19 (permalink) Old 02-02-2015, 06:22 PM
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4.10s. And frankly those are pushing it a bit for your cars goals. 4.30+ really are track gears

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post #5 of 19 (permalink) Old 02-02-2015, 07:04 PM
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I think it really depends on where you commute daily. If you are in an urban/suburban setting or in the twisty hills, 4.30s would be just fine. If you are on the open highway at highway speeds very much, I would have to say 4.10s.

What distance is your typical daily drive and at what speed?
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post #6 of 19 (permalink) Old 02-02-2015, 07:19 PM Thread Starter
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20 miles a day on the highway going 55 to work and back. Plus whatever putting around town I do.

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post #7 of 19 (permalink) Old 02-03-2015, 09:49 AM
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4.10s for daily. I think we still have a couple members that daily 4.30s but I feel like highway driving would be limited to 70mph. I wouldn't go 3.73

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post #8 of 19 (permalink) Old 02-03-2015, 10:42 AM Thread Starter
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With 4.30s at 70 MPH the.engine would.be spinning somewhere around 2700ish in 4th. With 4.10s it would be at 2500. Not a huge difference imo.

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post #9 of 19 (permalink) Old 02-03-2015, 10:53 AM
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ever think?



Ever think 3.90's?

That's what i run in my stock car. (Max rule for me)


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post #10 of 19 (permalink) Old 02-03-2015, 11:57 AM
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3.73's would be my go to gear for a daily driver. I wouldn't go higher than 4.10, but as tbirdtess mentioned 3.90's are a good in-between.

Speaking from experience, switching from 3.73's to 4.10's helped my track times but my top end is now very limited. 4.10's are not a highway friendly gear at all and 4.30's, IMHO, are a track only gear.

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post #11 of 19 (permalink) Old 02-03-2015, 01:26 PM
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TM, top end speed or top end acceleration? Acceleration should be better at every speed with 4.10s vs 3.73.

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post #12 of 19 (permalink) Old 02-03-2015, 05:05 PM
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Speed of course. You sacrifice a lot of top end speed with lower (numerically higher) gears because they push the RPMs up so much faster you end up running into your engine redline. My car tops out around 130 MPH in 3rd gear at my redline of 7,000 RPM with the 4.10's. At the stock redline of 5,500 RPM top end would be around 110 MPH or so. I learned the hard way not to to do top speed runs in OD because the OD band burns out.

I don't have the spreadsheet handy, but GM sent me an excel spreadsheet that does all the calculations for various gear ratios and MPH at various RPM speeds.

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post #13 of 19 (permalink) Old 02-03-2015, 06:39 PM
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Quote:
Originally Posted by ricklovin93 View Post
20 miles a day on the highway going 55 to work and back. Plus whatever putting around town I do.
I would have no fear of 4.30s based on what you said. You'd be around 2150 rpms in 4th at 55 mph with stockish tires.
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post #14 of 19 (permalink) Old 02-03-2015, 06:47 PM
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Quote:
Originally Posted by Trunk Monkey View Post
I don't have the spreadsheet handy, but GM sent me an excel spreadsheet that does all the calculations for various gear ratios and MPH at various RPM speeds.
I made a basic JavaScript calculator for a similar purpose...

http://wannerweb.noip.me/Public/TireCalc.htm

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post #15 of 19 (permalink) Old 02-03-2015, 07:04 PM
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Quote:
Originally Posted by driller View Post
I would have no fear of 4.30s based on what you said. You'd be around 2150 rpms in 4th at 55 mph with stockish tires.
But in the words of Sammy Hagar, I can't drive 55! Traffic around here is usually running around 80mph, and with 4.30s that puts you at 3100 vs 2700 with 3.73s. That makes a huge difference in terms of the comfort and noise level inside the car.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
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post #16 of 19 (permalink) Old 02-04-2015, 08:40 AM
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110 would suck. 130 not bad though lol

-Patrick
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post #17 of 19 (permalink) Old 02-18-2015, 02:42 PM
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I've driven both 3.73s and 4.10s for a number of years each, and ended up switching back to 3.73s. They make the car quieter and less busy. Plus, by switching to a shorter drag radial I really didn't lose anything at the track.

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post #18 of 19 (permalink) Old 04-03-2015, 12:26 PM
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post #19 of 19 (permalink) Old 05-09-2015, 05:59 PM
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time frame?



Hay, what's your time frame?

I have 4.10's in a 7.5" open dif. right up the road. (just over 200miles)
if you want to try them?

Tonawanda, ny 14150 - simson st.


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