AWD experiment.
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AWD experiment. Afraid of getting a too technical answer for my question, I'll try here. I already posted this same question on "Gears & Axles" with no success at all.
I'm on the built of an AWD V8 chassis for a project. I'm using a 4L60/65 with T-case removed from a 2003 Silvarado SS.
On the rear we got a 3.15 gear.
What ratio should I use in the front? Same as rear?
I found this old thread with useful info.
LS1 Tech crazyness
Please be nice with thechy language.
I'm on the built of an AWD V8 chassis for a project. I'm using a 4L60/65 with T-case removed from a 2003 Silvarado SS.
On the rear we got a 3.15 gear.
What ratio should I use in the front? Same as rear?
I found this old thread with useful info.
LS1 Tech crazyness
Please be nice with thechy language.
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
Afraid of getting a too technical answer for my question, I'll try here. I already posted this same question on "Gears & Axles" with no success at all.
I'm on the built of an AWD V8 chassis for a project. I'm using a 4L60/65 with T-case removed from a 2003 Silvarado SS.
On the rear we got a 3.15 gear.
What ratio should I use in the front? Same as rear?
I found this old thread with useful info.
LS1 Tech crazyness
Please be nice with thechy language.
I'm on the built of an AWD V8 chassis for a project. I'm using a 4L60/65 with T-case removed from a 2003 Silvarado SS.
On the rear we got a 3.15 gear.
What ratio should I use in the front? Same as rear?
I found this old thread with useful info.
LS1 Tech crazyness
Please be nice with thechy language.
As I recall, the Silverado SS T-case is a New Venture 149 which has a viscous coupling and a 38% front/ 62% rear nominal torque split so it won't act like a "solid" transfer case with minor variation in front/rear wheel speed. You still want to match front and rear gears with tire revs/mile as closely as possible. What are your available choices for front gears?
If you had 3.08 fronts and 3.15 rears you might run 245/45-17 fronts and 275/40-17 rears wihich would get you within 1% of same revs/mile. That should work.
Jon
I have a friend that bought an old 70's chevy 4x4 for a few hundred bucks. We locked the hubs in the snow on a day of fun on the trails and holy crap... It was fishtailing EVERYWHERE!!! Turns out, it came with 3.73s, but someone had swapped out an entire exle with 3.08's in the rear. When we had it in 4wd the back was spinning a whole lot faster, lol. Good thing we never found any pavement!
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Thread Starter
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Thanks guys! I really appreciate all the wisdom shared.
And sorry for the not high tech question, but it seems it is high tech for the "Gears & Axles", and of corse for me.
My question was based on the T-case torque change it does, so I thought maybe the gears were different due to that.
Tires I am using on this thing are: 285/35/19 and 235/40/18 ('06 Vette wheels, not Z06)
And sorry for the not high tech question, but it seems it is high tech for the "Gears & Axles", and of corse for me.
My question was based on the T-case torque change it does, so I thought maybe the gears were different due to that.
Tires I am using on this thing are: 285/35/19 and 235/40/18 ('06 Vette wheels, not Z06)
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I can get this done with different gears in secs 
lol 
I have an awd experiment of my own, http://www.turbols6.com/gallery/view...HOON-LSX-TURBO That 4l60 will not like all that traction.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
Thread Starter
TECH Apprentice
Joined: Oct 2007
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I have an awd experiment of my own, http://www.turbols6.com/gallery/view...HOON-LSX-TURBO That 4l60 will not like all that traction.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
Thread Starter
TECH Apprentice
Joined: Oct 2007
Posts: 307
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I have an awd experiment of my own, http://www.turbols6.com/gallery/view...HOON-LSX-TURBO That 4l60 will not like all that traction.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
there is a lot of awd info here, http://www.syty.net/ Look at the drivetrain tech area.
Thread Starter
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http://www.syty.net/ Almost all the high powered sytys even with the the 4.3 are running 4l80e trans, after destroying thier 4l60. when you have excellent traction and a lot of power, it tends to find the weak link, which seems to be the transmission.
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This thread is fine where it's at. He tried the correct place first. Looks like he's getting some info in here, so it's all good.
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Joined: Jun 2002
Posts: 1,979
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From: Upstate NY
Thanks guys! I really appreciate all the wisdom shared.
And sorry for the not high tech question, but it seems it is high tech for the "Gears & Axles", and of corse for me.
My question was based on the T-case torque change it does, so I thought maybe the gears were different due to that.
Tires I am using on this thing are: 285/35/19 and 235/40/18 ('06 Vette wheels, not Z06)
And sorry for the not high tech question, but it seems it is high tech for the "Gears & Axles", and of corse for me.
My question was based on the T-case torque change it does, so I thought maybe the gears were different due to that.
Tires I am using on this thing are: 285/35/19 and 235/40/18 ('06 Vette wheels, not Z06)
That's a lot of difference in tire diameter and revs/mile. 5.7%
You are not doing nice things to the viscous transfer case with that big of a spread in tire size. I would not recommend that combinatiion.
Good luck.
Jon
Thread Starter
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http://www.syty.net/ Almost all the high powered sytys even with the the 4.3 are running 4l80e trans, after destroying thier 4l60. when you have excellent traction and a lot of power, it tends to find the weak link, which seems to be the transmission.
When I destroy the 4L60, i might upgrade to 6L**. I like 6 gears.
Last edited by LSfan70s; Aug 21, 2009 at 11:51 PM. Reason: add info
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That means if the difference is 5.7% and I already got a 3.15 gear in the rear I will need 3.329 in the front for almost 0% difference. Right? Smaller wheels spin more right?
By the way, this experiment is making AWD a not AWD car. So I'm starting the chassis from scratch. And I would like to use a GM front differential.
Jon, so if I want to stick with the 2 different diameters, I will need to calculate how much more the font wheels will spin and get a higher gear in the front right?
That means if the difference is 5.7% and I already got a 3.15 gear in the rear I will need 3.329 in the front for almost 0% difference. Right? Smaller wheels spin more right?
By the way, this experiment is making AWD a not AWD car. So I'm starting the chassis from scratch. And I would like to use a GM front differential.
That means if the difference is 5.7% and I already got a 3.15 gear in the rear I will need 3.329 in the front for almost 0% difference. Right? Smaller wheels spin more right?
By the way, this experiment is making AWD a not AWD car. So I'm starting the chassis from scratch. And I would like to use a GM front differential.
285/35/19 = [(285 * .35) / 25.4] * 2 + 19 = 26.85
235/40/18 = [(235 * .40) / 25.4] * 2 + 18 = 25.40
26.86 ~ Tire revolutions at 60mph: 751.02
25.40 ~ Tire revolutions at 60mph: 793.97
Engine Rev's at 60mph 751.02 * 3.15 = 2365
Gear Required for 2365 engine rpm with 793 tire revs = 2.98
Doing the math, you might be better off with a 235/45-18 front tire and a 3.08 gear.