Rear End Gear Ratio for your conversion vehicle
07-28-2005, 06:56 PM
#1
Staging Lane
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Rear End Gear Ratio for your conversion vehicle Have a question about my situation:
Have a 2004 LS1/T56 ready to go into my '66 Elky, currently running a 10 bolt with Richmond 3.33 gears (mated to a Muncie 4 speed).
I believe the stock rear end ratio of the GTO the LS1/T56 came out of was a 3.46.
My question is, should I change the gears to match the 3.46, or maybe do something different altogether? Is the place I'm going to send my ECM to for reprogramming going to need to know my rear end ratio?
My intention for this vehicle is for it to be my daily driver. I am probably going to install completely stock for now (although I am contemplating cam and heads package while the motor is out), but will most likely add more power as I get more hands-on experience with the LS1.
Reason I am asking here instead of the Chassis section is because I want to see what you conversion people have for your daily drivers - and if your using different combinations due to the different weight/handling/etc. of the conversion vehicle you have.
Have a 2004 LS1/T56 ready to go into my '66 Elky, currently running a 10 bolt with Richmond 3.33 gears (mated to a Muncie 4 speed).
I believe the stock rear end ratio of the GTO the LS1/T56 came out of was a 3.46.
My question is, should I change the gears to match the 3.46, or maybe do something different altogether? Is the place I'm going to send my ECM to for reprogramming going to need to know my rear end ratio?
My intention for this vehicle is for it to be my daily driver. I am probably going to install completely stock for now (although I am contemplating cam and heads package while the motor is out), but will most likely add more power as I get more hands-on experience with the LS1.
Reason I am asking here instead of the Chassis section is because I want to see what you conversion people have for your daily drivers - and if your using different combinations due to the different weight/handling/etc. of the conversion vehicle you have.
07-28-2005, 07:48 PM
#2
Gear selection is prettymuch up to your personal preference. It all depends on how you drive the car. Since you are having your computer reprogramed it doesn`t really matter what gear you use, the programmer just needs to know what gear you have and what your tire height is. I am going to be putting a 5.3l out of a 2001 tahoe (unknow gear and tire height) into my 85 El Camino daily driver with a 3.73 gear.
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07-29-2005, 09:47 AM
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5.13 
But I need that much gear with 37" tall tires, and to crawl around in the rocks at 2 mph.
It still works well at highway speeds in OD.
If you want to play around with gearing/tire size and final drive ratios, check out the calculators at Randy's Ring and Pinion
But I need that much gear with 37" tall tires, and to crawl around in the rocks at 2 mph.
It still works well at highway speeds in OD. If you want to play around with gearing/tire size and final drive ratios, check out the calculators at Randy's Ring and Pinion
07-29-2005, 09:58 AM
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07-29-2005, 12:28 PM
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Staging Lane
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So basically, is this correct?
(might be slightly exaggerated)
With 4.11's, you can dump the clutch at 2000 rpm and leave rubber for 612 ft.
With 3.33's, you can dump the clutch at 2000 rpm and leave 10 ft. of rubber, but your top speed will be 398.2 mph.
Is top speed vs. stoplight to stoplight speed the biggest difference in choosing rear end ratio's?
(might be slightly exaggerated)
With 4.11's, you can dump the clutch at 2000 rpm and leave rubber for 612 ft.
With 3.33's, you can dump the clutch at 2000 rpm and leave 10 ft. of rubber, but your top speed will be 398.2 mph.
Is top speed vs. stoplight to stoplight speed the biggest difference in choosing rear end ratio's?
07-29-2005, 01:55 PM
#13
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Answering my own questions here - this is a great write up - check it out:
The right way to choose a gear ratio combination.
And this one is pretty cool too:
Rear End Gear Selection
The right way to choose a gear ratio combination.
And this one is pretty cool too:
Rear End Gear Selection
07-29-2005, 03:33 PM
#14
TECH Resident
I'm real happy with my 3.70 gears, I don't have a tach but the motor just sounds sweet at 70 mph, I'm getting over 25 mpg and the zero to 100 is STRONG. I have 29" tires on the rear so they are a little tall (ya hafta fill the fenders on one of these ol guys).
Cruisin' to The Old Walck Inn tonight with a bunch of hot rod guys......good burgers!
Cruisin' to The Old Walck Inn tonight with a bunch of hot rod guys......good burgers!
Last edited by Oscar Will; 07-29-2005 at 03:35 PM. Reason: add info
07-29-2005, 03:52 PM
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Ford 8.8 in my Miata I'm running a 1995 Thunderbird IRS, 3:73 Ford Racing ring & pinion with the new Detroit Locker true-trac posi, no clutch packs it has helical gears, like Guru's Australian V8 supercar series set-up does for roadracing. Custom axles.
