3.73 vs. 4.10

biminiLX

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I wish motorsport would make a 3.90 ratio so I could do that and not worry about it being noisy. I dont trust motive or richmond

What tire do you plan on running?
That makes a huge effect on this IMO.
If I was running a shorter tire, I would likely do the 3.73, but my goal is to run a 10 on the DR I will be driving on.
I'd personally risk the 3.90 as long as there was some reassurance/warranty that if its noisy it would be replaced.
-J
 

biminiLX

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I think for every inch in tire diameter you will gain/lose approximately .1 of gear ratio. I forget the exact number, but I would say that with a 28.7" tire you would be closer to 3.65 that 3.55.

4.10 would put you real close to 4.0

Thanks, I just kept playing with trap speeds for the goals and projected RPM ranges I'd want to keep and it keeps spitting back 4.0-4.30s.
We shall see, I will def. update this after I get gears installed.
-J
 

biminiLX

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4.30s r too much you will be 7K + on a good pass ...... if u can drive lol !!!

Yep, agreed. I'm leaning toward splitting the difference and going 3.90, just hesitant as its not a FRPP gear.

My driver mod may not be as strong as yours :D but I did run an 11.94 on stock tires on my first pass w/o electronics at Norwalk.
I probably call you soon to discuss GT500 plans :beer:
-J
 

KsE

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Perfect that's the real world experience I was hoping for.
What mods/power level is your car at? Which drag radial?

Mods are in sig below. And it's a monster on roll races. You'll have to shift into 5th to get over 150, but there's no point to prove after that speed IMO
 

03cobra#694

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Yep, agreed. I'm leaning toward splitting the difference and going 3.90, just hesitant as its not a FRPP gear.

My driver mod may not be as strong as yours :D but I did run an 11.94 on stock tires on my first pass w/o electronics at Norwalk.
I probably call you soon to discuss GT500 plans :beer:
-J


call anytime ... and u drive just fine ... just a little shove to make u get to the track sooner. go with the 4.10s u wont regret it .
 

Luillo69

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This is a very old one but were you asking 4.10 vs 3.73 on stock TR6060 gear 2.66 or T56 2.97?
 

Real Time Recon

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I've had both .....The 4:10 on my 67 Chevelle SS 396(I ordered from the factory in 67) was a good rear end, BUT at 70 on the thruway the engine was screaming in 4th gear.
The 3:73 on the other-hand (on my current FFCobra) is only pulling 1,500 RPMs at 50 mph ,in 5th gear.(both cars 15' wheels)
Thinking I like the 373 better :)
One drawback on the 373 is first gear is "Spent" in one second .But then again,the Cobra is doing 0-60 well under 4 seconds.
 
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1Kona_Venom

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What does your gearing on other applications, have to do with gearing in the 13/14?

Ive had both to over the years. In various "other cars".

3:73s are 100% practical and 1st gear isnt spent in seconds. Furthermore, if the owner stayed with a stock or near stock Trinity setup, 4:10s would be ideal


I've had both .....The 4:10 on my 67 Chevelle SS 396(I ordered from the factory in 67) was a good rear end, BUT at 70 on the thruway the engine was screaming in 4th gear.
The 3:73 on the other-hand (on my current FFCobra) is only pulling 1,500 RPMs at 50 mph ,in 5th gear.(both cars 15' wheels)
Thinking I like the 373 better :)
One drawback on the 373 is first gear is "Spent" in one second .But then again,the Cobra is doing 0-60 well under 4 seconds.

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Luillo69

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What does your gearing on other applications, have to do with gearing in the 13/14?

Ive had both to over the years. In various "other cars".

3:73s are 100% practical and 1st gear isnt spent in seconds. Furthermore, if the owner stayed with a stock or near stock Trinity setup, 4:10s would be ideal




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The reason I am reviving this thread is because I’m on that position. Currently using the stock TR6060 which has the 2.66 1st and I have on hand 4.10 to finish my rear end upgrade.

The issue is that I have a T56 with 2.97 1st that will be installed in 6-8 months and later down the road I will be adding boost to hit somewhere the 780-800hp.

I’m just trying to receive feedback about 3.73 vs 4.10 for the 2.97 1st gear


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Real Time Recon

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What does your gearing on other applications, have to do with gearing in the 13/14?

Ive had both to over the years. In various "other cars".

3:73s are 100% practical and 1st gear isnt spent in seconds. Furthermore, if the owner stayed with a stock or near stock Trinity setup, 4:10s would be ideal




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The OP asked for "Real World" experiences / input ! Sorry if you didn't like my reply to this thread on 373s vs 410............And yes (as I posted ) ...on my Factory Five Cobra 1st gear IS SPENT w/in ONE second in close to full throttle ! On a stock Tremic T-5)and...YOU... have a good day ! :mad::p:eek:
PS...Rear end gearing does Not care WHAT car it's pushing :)
Also a 67 Chevelle SS/396 is close to the weight of a GT-500
And don't bother replying,Ive owned muscle cars LONG before you were born .
 
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1Kona_Venom

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Here's the reply that you didn't want




The OP asked for "Real World" experiences / input ! Sorry if you didn't like my reply to this thread on 373s vs 410............And yes (as I posted ) ...on my Factory Five Cobra 1st gear IS SPENT w/in ONE second in close to full throttle ! On a stock Tremic T-5)and...YOU... have a good day ! :mad::p:eek:

And again, I'll ask how does this explanation pertain to TR6060 or a T56?
It doesn't (Ref post#27 and #30)


PS...Rear end gearing does Not care WHAT car it's pushing :)

May not care what car, but it certainly cares about other contributors; rear end tq etc.
Again, rambling on the keyboard

Also a 67 Chevelle SS/396 is close to the weight of a GT-500

stop trying to type with your dick in your hand
Your sister weighs the same as my John Deere zero turn
~~ pointless comparison


And don't bother replying,Ive owned muscle cars LONG before you were born .


To the OP's original question, you sure took long enough to help him out. He only asked back in July of 2013.
 
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Luillo69

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The OP asked for "Real World" experiences / input ! Sorry if you didn't like my reply to this thread on 373s vs 410............And yes (as I posted ) ...on my Factory Five Cobra 1st gear IS SPENT w/in ONE second in close to full throttle ! On a stock Tremic T-5)and...YOU... have a good day ! :mad::p:eek:
PS...Rear end gearing does Not care WHAT car it's pushing :)
Also a 67 Chevelle SS/396 is close to the weight of a GT-500
And don't bother replying,Ive owned muscle cars LONG before you were born .

The difference I think we are talking is not within the weight of the car but the gearing of the transmission from GT500 TR6060 either 2.66 or earlier 2.98. It makes a huge difference when we add either a 3.73 vs 4.10. I just roll race a friend with a 2018 GT T56 2.97 first and 3.73. He shifted twice before I got out of second gear. I will be using the same gearing he does but I’m not sure if 4.10 will be way to overkill or not.

I seen many 2013 with stock trans using 4.10 and loving it but not many on the T56 or earlier TR6060 with where 2.98 1st gears.


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1Kona_Venom

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Can I ask, what platform / car are you driving and modding in your plans here?

The difference I think we are talking is not within the weight of the car but the gearing of the transmission from GT500 TR6060 either 2.66 or earlier 2.98. It makes a huge difference when we add either a 3.73 vs 4.10. I just roll race a friend with a 2018 GT T56 2.97 first and 3.73. He shifted twice before I got out of second gear. I will be using the same gearing he does but I’m not sure if 4.10 will be way to overkill or not.

I seen many 2013 with stock trans using 4.10 and loving it but not many on the T56 or earlier TR6060 with where 2.98 1st gears.


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Luillo69

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Can I ask, what platform / car are you driving and modding in your plans here?



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I have a 2013 GT500. Will be installing a T56 with a 2.97 1st gear. I have all the parts to upgrade my 8.8 with currently have a 4.10 sets of gears on hand. I’m thinking of changing that to 3.73


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Catmonkey

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I have a 2013 GT500. Will be installing a T56 with a 2.97 1st gear. I have all the parts to upgrade my 8.8 with currently have a 4.10 sets of gears on hand. I’m thinking of changing that to 3.73
Given that, 3.73s. What are the 5th and 6th gear ratios?
 

Luillo69

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Given that, 3.73s. What are the 5th and 6th gear ratios?

I will have to search that again but I’m very sure is the same on both transmissions.

TR6060:
1st-2.66
2nd-1.82
3rd-1.30
4th-1.00
5th-.77
6th-.50

T56:
1st-2.97
2nd-2.10
3rd-.46
4th-1.00
5th-.80
6th-.63


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Jam421

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Please correct me if I'm wrong on stock tire height....it's been a few years !
When I did the math for my 305x35x20 MT DR at 28.7"OD ....given stock tire height at 27", with the taller MT 4.10's actually converted to 3.86 rear gear ratio. I'd imagine this ratio may increase if tire psi is much lower than recommended? I run my MT's at 21psi on the street....so I'd guess it may be closer to 3.90's. When I had 3.73's ( 2sets) out back the converted ratio was a 3.51 rear gear. ut eventually they whined. 4.10's for 4 yrs ...no whine.

See: " Effective Gear Ratio With New Tire Size"
Wallace Racing - Gear/Speed Calculator
 

Luillo69

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I just made an exchange with another GT500 owner that wanted the 4.10 I had for his 3.73.

We will see how the car responds once I finish my rear end and use it with the stock TR6060. I will do the T56 mag swap later on next year


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