6 speed
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
6 speed
Hey Guys, I have a 99 coupe with 3.42 6 speed /// in 6th I mostly have to stay above 75 to keep from bogging the engine. I was going to change the dif to 3.90 or 4.10 gears. I want to keep my 4.42 dif (for whatever reason) Now I am thinking (ya everybody run) would it be better to go with a ZO 6 trans instead ??? I want lower end performance and higher RPM in 6th ???????? the ZO 6 is much better trans right ????
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Hey Guys, I have a 99 coupe with 3.42 6 speed /// in 6th I mostly have to stay above 75 to keep from bogging the engine. I was going to change the dif to 3.90 or 4.10 gears. I want to keep my 4.42 dif (for whatever reason) Now I am thinking (ya everybody run) would it be better to go with a ZO 6 trans instead ??? I want lower end performance and higher RPM in 6th ???????? the ZO 6 is much better trans right ????
The 6-speed transmission is essentially the same as the Z-06 6-speed with the major difference being the 1st - 4th gear ratios;
Are you sure there isn't another problem?
Good luck... GUSTO
Last edited by GUSTO14; Jan 11, 2016 at 02:32 PM.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
Paul, I have a 2000 Hardtop and frankly it will not bog in 6th gear and 1700 rpm. Granted if I want to get on it, I probably won't nail it at 1700 rpm and certainly don't expect it to accelerate like a freight train, but it will move off smartly without any hesitation. You need to realize that top speed in these cars will not be reached in 6th gear, it's typically reached in 5th gear.
Are you sure there isn't another problem?
Good luck... GUSTO
Are you sure there isn't another problem?
Good luck... GUSTO
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
when I first got the car at 75 it was around 1600 rpm,then last winter I put on new tires and wheels (went to 18's and 19's ) after that at 75 I'm around 1450 rpm or so !!! also added headers so you hear the engine better, and I learned at a early age not to bog the engine.I do want more performance and lower gears really make a difference. As I have been on this forum I found out the ZO 6 has lower ratio's though all gears. also if I have 6 gears I want to use all of them !!!
Back in the late 60's someone gave me a set of 9.00/15's that I installed on my '63 Corvette with 3.73:1 gears. (I was having trouble getting my rear tires to last...
) Previously I had no difficulty lighting up my 7.75 tires in 1st thru 3rd gear. With the taller 9.00's I now had no difficulty smoking my clutch!
Good luck and let us know how it works for you... GUSTO
Melting Slicks
Joined: Feb 2014
Posts: 2,725
Likes: 149
From: chicago area IL.
i have 3.73 in mine and on the highway i dont have to got to 5th to pass any one 6th gear has plenty of power for that i can even put around in 6th at 40mph and pickup speed with out bogging the car but my hp is not stock (430rwhp 390rwtq) with stock tire size i'm turning 2100ish rpm's @ 75mph
Drifting
Joined: Jul 2012
Posts: 1,325
Likes: 239
From: Missi'ppi... no mo' MO for me!!
I dunno if this'll help or not... I've got an 03 z06 with an OEM stock rear end. I've added a Callaway-Honker CAI and a set of long tubes. I was running it without a tune for a while.
Typically, I cruise on the freeway at 73mph (8mph over the limit) and it didn't bog. Even at 40mph in 6th, it's ok. I can't flog it at 40. But at freeway speeds it moves out without a downshift though not smartly. (That's why I decided to get a Chuck CoW tune; everyone advised I left too much unharnessed by omitting a tune after the CAI and header mod.)
Typically, I cruise on the freeway at 73mph (8mph over the limit) and it didn't bog. Even at 40mph in 6th, it's ok. I can't flog it at 40. But at freeway speeds it moves out without a downshift though not smartly. (That's why I decided to get a Chuck CoW tune; everyone advised I left too much unharnessed by omitting a tune after the CAI and header mod.)
Melting Slicks
Joined: Jun 2013
Posts: 3,473
Likes: 691
From: West Virginia
Something here does not add up. The "standard" C5 is geared 44mph/1,000rpm in 6th. Bigger wheels and tires would make no difference at all to displayed speed and definitely would not affect that 44mph/1,000rpm ratio, which is controlled by the rear axle ratio.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
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Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
Something here does not add up. The "standard" C5 is geared 44mph/1,000rpm in 6th. Bigger wheels and tires would make no difference at all to displayed speed and definitely would not affect that 44mph/1,000rpm ratio, which is controlled by the rear axle ratio.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Dude!!!!!
Hey Guys, I have a 99 coupe with 3.42 6 speed /// in 6th I mostly have to stay above 75 to keep from bogging the engine. I was going to change the dif to 3.90 or 4.10 gears. I want to keep my 4.42 dif (for whatever reason) Now I am thinking (ya everybody run) would it be better to go with a ZO 6 trans instead ??? I want lower end performance and higher RPM in 6th ???????? the ZO 6 is much better trans right ????
The reason that mod was sooo popular is because I put them in every C5 and C6 stick for years.
We have 20 Getrag cores here and we LOVE TO DO 4.10s....
There is not one single viable reason NOT to do it.
4.10s w/ Z51.... AWESOME! and drives like sock.... Better on the highway....Better on the bottom too.
You wanna LOVE your car again and make the clutch last longer....
Do the right thing....
We LOVE 4.10s!
Chuck CoW
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
Something here does not add up. The "standard" C5 is geared 44mph/1,000rpm in 6th. Bigger wheels and tires would make no difference at all to displayed speed and definitely would not affect that 44mph/1,000rpm ratio, which is controlled by the rear axle ratio.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
All that happens with bigger wheels/tires is that your speedometer will read a bit "slow" compared to actual vehicle speed.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
Dude!!!!! There are a bunch of reasons to go with the 4.10s. You're crazy if you don't.
The reason that mod was sooo popular is because I put them in every C5 and C6 stick for years.
We have 20 Getrag cores here and we LOVE TO DO 4.10s....
There is not one single viable reason NOT to do it.
4.10s w/ Z51.... AWESOME! and drives like sock.... Better on the highway....Better on the bottom too.
You wanna LOVE your car again and make the clutch last longer....
Do the right thing....
We LOVE 4.10s!
Chuck CoW
The reason that mod was sooo popular is because I put them in every C5 and C6 stick for years.
We have 20 Getrag cores here and we LOVE TO DO 4.10s....
There is not one single viable reason NOT to do it.
4.10s w/ Z51.... AWESOME! and drives like sock.... Better on the highway....Better on the bottom too.
You wanna LOVE your car again and make the clutch last longer....
Do the right thing....
We LOVE 4.10s!
Chuck CoW
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You can always go the route of getting a Custom built TRANSZILLA T-60/60 Trans!!!
I had a spare MN-12 and had Chucks Buddy George it converted to a T60-60 Trans!
I didn't have George change any gearing but WOW!!-- Its a great trans. He can put any gear ration you want in it..
I had a spare MN-12 and had Chucks Buddy George it converted to a T60-60 Trans!I didn't have George change any gearing but WOW!!-- Its a great trans. He can put any gear ration you want in it..
Last edited by Bill Curlee; Jan 12, 2016 at 03:12 PM.
Thread Starter
1/4 mile/AutoX
Joined: Jun 2014
Posts: 11,441
Likes: 2,186
From: Buffalo Texas
You can always go the route of getting a Custom built TRANSZILLA T-60/60 Trans!!! I had a spare MN-12 and had Chucks Buddy George it converted to a T60-60 Trans!
I didn't have George change any gearing but WOW!!-- Its a great trans. He can put any gear ration you want in it..
I had a spare MN-12 and had Chucks Buddy George it converted to a T60-60 Trans!I didn't have George change any gearing but WOW!!-- Its a great trans. He can put any gear ration you want in it..
could you give me those gear ratio's ???? (more pricey than a diff ??)
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
MORE PRICEY THAN A DIFF!!!
Check out this site.. Answers your ratio questions.
http://www.rsgear.com/products/trans...remec-t56.aspx
Melting Slicks
Joined: Jun 2013
Posts: 3,473
Likes: 691
From: West Virginia
I