Rear end concerns
Thread Starter
Racer
Joined: Oct 2004
Posts: 366
Likes: 0
From: Murrieta Ca
Rear end concerns
I would like to upgrade my rear end to either 3.73, or 3.90. My car came with a 2.73. I need information on the following;
1. Are there any drawbacks to go to a 3.90?
2. Does the transmission need to be re programmed, and how dows that work?
3. Do i need a new torque converter?
4. How much will it cost with labor, and where is the best place in so cal to have this done?
This car will never see the track, just want to haul *** off the line, and fly when I punch it on the freeway.
1. Are there any drawbacks to go to a 3.90?
2. Does the transmission need to be re programmed, and how dows that work?
3. Do i need a new torque converter?
4. How much will it cost with labor, and where is the best place in so cal to have this done?
This car will never see the track, just want to haul *** off the line, and fly when I punch it on the freeway.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
2. Does the transmission need to be re programmed, and how dows that work?
yes; either by a DIY programer (LS1Edit, Predator, HP...) or by a speed shop that can do the reprog for you.
3. Do i need a new torque converter?
No; but if going to a higher stall is in your future... then do them both at the same time. You'll nearly double the labor costs doing them seperately
1. Are there any drawbacks to go to a 3.90?
loss of traction. But it can be regained by new (different) tires and suspension upgrades.
yes; either by a DIY programer (LS1Edit, Predator, HP...) or by a speed shop that can do the reprog for you.
3. Do i need a new torque converter?
No; but if going to a higher stall is in your future... then do them both at the same time. You'll nearly double the labor costs doing them seperately
1. Are there any drawbacks to go to a 3.90?
loss of traction. But it can be regained by new (different) tires and suspension upgrades.
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Originally Posted by Mike Mercury
1. Are there any drawbacks to go to a 3.90?
loss of traction. But it can be regained by new (different) tires and suspension upgrades.
loss of traction. But it can be regained by new (different) tires and suspension upgrades.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by Lensboard
Dumb question, but what does higher stalls mean?
This information might help you in your decision.
http://auto.howstuffworks.com/torque-converter.htm
http://www.converter.cc/frequently_asked_questions.htm
3.90s are pretty strong for an automatic and traction will become a real issue.
Last edited by '06 Quicksilver Z06; Oct 17, 2004 at 09:52 PM.
Thread Starter
Racer
Joined: Oct 2004
Posts: 366
Likes: 0
From: Murrieta Ca
Than if my goal is to get a fast mover for street use, and on the freeway, I should probably back off to a 3.73?...no?
btw, thanks for the "newbie" links.
Nobody has mentioned prices, or favorite places to have this done in so cal?
btw, thanks for the "newbie" links.
Nobody has mentioned prices, or favorite places to have this done in so cal?
Last edited by Lensboard; Oct 17, 2004 at 11:23 PM.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Than if my goal is to get a fast mover for street use, and on the freeway, I should probably back off to a 3.73?...no?
My car may never see a track, but I want to be able to maintain the ability to smoke most anything on the freeway,...
Especially 3.42 and 3.73 geared cars.
3.90s, 4.10s are typically for hard core race enthusiasts and hobbyist who are going to frequent the track.
I'm still trying to figure out what it is that you are trying to accomplish. What are you going after? Vipers? Z06s? Blown Cobras? Juiced ricers? Sport bikes? Anything you run across? There'll always be someone faster.
Since I don't street race, I built my car based on an ET and other track performance levels I wished to reach. I have no idea how to build a car for street racing as there are so many fast cars on the street. Perhaps if we knew what you were trying to do you could get better advice.
"just want to haul *** off the line, and fly when I punch it on the freeway." is sort of vague. How much *** do you want it to haul off the line??? So much that you will need ET streets or slicks or do you want to run street tires? How much rubber do you want to leave and from how fast of a roll???
Last edited by '06 Quicksilver Z06; Oct 18, 2004 at 12:39 AM.
Thread Starter
Racer
Joined: Oct 2004
Posts: 366
Likes: 0
From: Murrieta Ca
Thanks for trying to help. It sounds like 3.42 to 3.73 is where I want to be. I would love to drive a car with those setups, just need to find one. I do not want to drag race, but I want to smoke most "stock" vehicles on the freeway, when I want to. I get from all of your responses, that 3.42 to 3.73 is probably going to do that. Any suggestions for a shop in so california to ask these types of questions to? I already have an email into AandACorvette.
Thanks
Thanks
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Drifting
Joined: Nov 2003
Posts: 1,288
Likes: 2
From: tucson az
i run 4.10/stock converter...love it 
you have a problem with your thinking ...
the higher ratio will make the car accelerate like a bat out of hades
but it limits the top end....
my rpm at 85 is about 3200....if you like the sound of high revin v8's like i do , it is awesome
i dont go much over 100 on the highway and do not need a 175 mph car...the 4.10 works for me
you may want to stay with 3.42 if you drive lots of highway miles ...
if you are deciding between 3.90 and 4.10 get the 4.10
you have a problem with your thinking ...
the higher ratio will make the car accelerate like a bat out of hades
but it limits the top end....
my rpm at 85 is about 3200....if you like the sound of high revin v8's like i do , it is awesome
i dont go much over 100 on the highway and do not need a 175 mph car...the 4.10 works for me
you may want to stay with 3.42 if you drive lots of highway miles ...
if you are deciding between 3.90 and 4.10 get the 4.10