trutrac and 3.55 gears with a C4
12-08-2009, 02:34 PM
#2
5th Gear Member
Join Date: Jan 2006
Location: Colorado
Posts: 3,946
Usually you can't have both. A lower gear like a 3.55 will give you better acceleration but higher rpms on the highway. I assume you have like a 2.79 or 3.00 in there now. The truetrac will help coming off the line but that is about it. So you should get better acceleration and worse gas milage.
12-08-2009, 02:46 PM
#3
Moderator
Join Date: Dec 2005
Location: Hills of California
Posts: 5,208
the c4 is a 1:1 ratio in 3rd if your rear tire is 25" tall it will take 4000 rpm to keep up with Ca traffic at 80mph.
If you indeed have the 2.79 which is very likely at 80 mph you are turning 3000 rpm
have you considered at t5 swap so you get over drive? with t5 in 5th with 3.55s you'll spin 2500 rpm at 80
-Gun
If you indeed have the 2.79 which is very likely at 80 mph you are turning 3000 rpm
have you considered at t5 swap so you get over drive? with t5 in 5th with 3.55s you'll spin 2500 rpm at 80
-Gun
12-08-2009, 05:49 PM
#4
5th Gear Member
Join Date: Dec 2008
Location: Texas
Posts: 4,462
If you do alot of highway driving, you won't like 3.50 gears without having overdrive.
I have 3.50 gears and a T5 and it makes the perfect cruiser. It does great on the highway and also has great get up and go around town.
Like GunJam said, the rpm on the highway are down. My car turns around 2k at 70 mph.
I have 3.50 gears and a T5 and it makes the perfect cruiser. It does great on the highway and also has great get up and go around town.
Like GunJam said, the rpm on the highway are down. My car turns around 2k at 70 mph.
12-09-2009, 11:39 PM
#6
4th Gear Member
Join Date: Jun 2006
Location: Upland, California
Posts: 1,246
i have a c4 with 3.80 gears
I only drive 4 miles on the freeway max either way but it is not fun, its very loud, uses lots of gas, etc etc
i usually stick to 65mph in the right lane and only speed up faster if i need to pass a car or truck
I only drive 4 miles on the freeway max either way but it is not fun, its very loud, uses lots of gas, etc etc
i usually stick to 65mph in the right lane and only speed up faster if i need to pass a car or truck
12-09-2009, 11:54 PM
#7
Join Date: Sep 2009
Location: Florida
Posts: 21
If you like your automatic you could do an AOD swap. It has a .67 top gear so you could pretty much have you cake and eat it too, so to speak. It would put you somewhere around 2300 rpm at 72mph which is very good all around. My daughter has a 96GT I put 3.73s in to help her gas mileage in town and it pick up about 4mpg over the stock gears.
12-10-2009, 12:05 AM
#8
6th Gear Member
Join Date: Aug 2007
Location: Elk Grove, CA
Posts: 5,896
Gun Jam, you don't have to drive 80 on the freeway:P Max speed limit on I5 is 70, and while you can safely go 80, you can also safely go 65-70:P I cruise around in my fb with 3.25 gears and 24" tires at 70 all the time pushing ~3300rpm. 3.55's and 25" tires wouldn't be much different. It'd be loud and would guzzle gas, but it would be doable.
12-10-2009, 12:08 AM
#9
2nd Gear Member
Join Date: Feb 2008
Location: arizona
Posts: 199
the c4 is a 1:1 ratio in 3rd if your rear tire is 25" tall it will take 4000 rpm to keep up with Ca traffic at 80mph.
If you indeed have the 2.79 which is very likely at 80 mph you are turning 3000 rpm
have you considered at t5 swap so you get over drive? with t5 in 5th with 3.55s you'll spin 2500 rpm at 80
-Gun
If you indeed have the 2.79 which is very likely at 80 mph you are turning 3000 rpm
have you considered at t5 swap so you get over drive? with t5 in 5th with 3.55s you'll spin 2500 rpm at 80
-Gun
