3.42 to 3.73????
Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
3.42 to 3.73???? i have 3.42 gear in my car right now and just got a full install kit becuase of the pinion bearing is going and i ordered 3.73 gears while i was at it.
in my quarter mile time on slicks how much of a difference will this make??
98 z28
i am going tomorrow to see what it will run now on street then on slicks and next weekend after the install im going to do the same what should i expect for a change in my time???
in my quarter mile time on slicks how much of a difference will this make??
98 z28
i am going tomorrow to see what it will run now on street then on slicks and next weekend after the install im going to do the same what should i expect for a change in my time???
Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
i ran my car today and it ran a 13.38 on street tires and with the 3.42's.
i was pretty happy with the times for a .989 reation and a 2.1 60ft and i didn't expect anything more than a 13.5 at max with only the muffler cut off, lid and power programmer
tomorrow the 3.73's r going in and next weekend ill probably be back at the track weather permitting.
what should i expect now??
LT's r next
i was pretty happy with the times for a .989 reation and a 2.1 60ft and i didn't expect anything more than a 13.5 at max with only the muffler cut off, lid and power programmer
tomorrow the 3.73's r going in and next weekend ill probably be back at the track weather permitting.
what should i expect now??
LT's r next
TECH Enthusiast
Joined: Jan 2005
Posts: 697
Likes: 0
From: On a car lot, shopping...
I wouldn't expect much. Thats not a big change in gears. If you had 3.23's then it would make a bigger difference. 4.10's would be a bigger step in the right direction.
http://www.f-body.org/gears/
This will show you more of what I mean.
http://www.f-body.org/gears/
This will show you more of what I mean.
Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
my car is still a daily driver for now so i didnt' want to get 4.10's i had to replace the pinion bearing and seals so i figured y not make a little step up while im at it.
my car today ran 13.503 with slicks
and 13.388 with street tires.
ohh yeah and a 13.66 with the a/c on max
ooops
my car today ran 13.503 with slicks
and 13.388 with street tires.
ohh yeah and a 13.66 with the a/c on max
ooops
Originally Posted by bandit_ad22
my car today ran 13.503 with slicks
and 13.388 with street tires.
and 13.388 with street tires.
I think you should have gone with at least 3.90s in my opinion. 3.73 is barely worth even changing for from a 3.42.
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Originally Posted by keliente
The track may have been different for those runs...may have been hotter, etc. The problem with using slicks & stock gears is that sometimes the car hooks so good and then there is just not enough gear there to get the bitch moving out of the hole.
I think you should have gone with at least 3.90s in my opinion. 3.73 is barely worth even changing for from a 3.42.
I think you should have gone with at least 3.90s in my opinion. 3.73 is barely worth even changing for from a 3.42.
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Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
no i have an A4 thats y i don't want to go wtih 4.10's because of the high rpms at 70-80 cruising.
the runs were about 15 minutes apart and the track was as close as it could be to the same the thing is what u said out of the hole it wouldn't spin to get to where the power is cause it did with street tires and it felt alot better out of the hole
i just went with 3.73's ebcause it had to come apart anyways so i figured y not put somethin a little taller but won't kill my gas milage or cause crazy rpms for normal driving
the runs were about 15 minutes apart and the track was as close as it could be to the same the thing is what u said out of the hole it wouldn't spin to get to where the power is cause it did with street tires and it felt alot better out of the hole
i just went with 3.73's ebcause it had to come apart anyways so i figured y not put somethin a little taller but won't kill my gas milage or cause crazy rpms for normal driving
On The Tree
Joined: May 2003
Posts: 132
Likes: 0
From: USA
I just installed 4.10's the other night, and so far I love them. I haven't gone WOT yet (trying to be easy on them for a while), but I can tell a huge difference just going up to about 3-3500rpms in 2nd and 3rd gear. It feels like if I went WOT, and had slicks/12 bolt, the front tires would come off the ground just a little! 
The only thing I don't like is the whistle/howl I get in 6th gear when cruising around 60-70mph.
The only thing I don't like is the whistle/howl I get in 6th gear when cruising around 60-70mph. Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
Originally Posted by VaderWS6
I just installed 4.10's the other night, and so far I love them. I haven't gone WOT yet (trying to be easy on them for a while), but I can tell a huge difference just going up to about 3-3500rpms in 2nd and 3rd gear. It feels like if I went WOT, and had slicks/12 bolt, the front tires would come off the ground just a little! The only thing I don't like is the whistle/howl I get in 6th gear when cruising around 60-70mph.
The only thing I don't like is the whistle/howl I get in 6th gear when cruising around 60-70mph. Thread Starter
Staging Lane
Joined: Apr 2006
Posts: 85
Likes: 0
From: MI
if u check my code and match my code to the chart it says mycar came with 3.42's cause i called the dealer to get a price on the bearings and a new set of gears just wondering and i had to go get them the code from the inside of the door.
Originally Posted by keliente
Yes they are.
Originally Posted by bandit_ad22
if u check my code and match my code to the chart it says mycar came with 3.42's cause i called the dealer to get a price on the bearings and a new set of gears just wondering and i had to go get them the code from the inside of the door.
Originally Posted by BriancWS6
I have never seen them available ANYWHERE. I have also never seen or heard anyone having them unless it was in a 12 bolt or 9in. Post a link where I can see them available, I really hope you can prove me wrong, but I doubt it
https://ls1tech.com/forums/gears-axles/525920-3-90-s.html
Here is a link to Motive 3.90's on summitracing. click here
So there!
They are a new release, if it makes you feel any better, hehe. I think they just started selling them a couple of months ago, if that.
Originally Posted by keliente
My friend just installed them into his 10 bolt. He is local to me.
https://ls1tech.com/forums/showthread.php?t=525920
Here is a link to Motive 3.90's on summitracing. click here
So there!
They are a new release, if it makes you feel any better, hehe. I think they just started selling them a couple of months ago, if that.
https://ls1tech.com/forums/showthread.php?t=525920
Here is a link to Motive 3.90's on summitracing. click here
So there!
They are a new release, if it makes you feel any better, hehe. I think they just started selling them a couple of months ago, if that.
But I am honestly glad that your right in the end, cause I always wanted to be able to purchase a set of them for my 10 bolt! Thing is, here lately I have been looking into getting some 4.10s thinking that the 3.90s had to come later on when the 12 bolt does, so now it's decisions, decisions!
Originally Posted by BriancWS6
That is awesome, so technically we were both right But I am honestly glad that your right in the end, cause I always wanted to be able to purchase a set of them for my 10 bolt! Thing is, here lately I have been looking into getting some 4.10s thinking that the 3.90s had to come later on when the 12 bolt does, so now it's decisions, decisions!
But I am honestly glad that your right in the end, cause I always wanted to be able to purchase a set of them for my 10 bolt! Thing is, here lately I have been looking into getting some 4.10s thinking that the 3.90s had to come later on when the 12 bolt does, so now it's decisions, decisions!