- 07-29-13 02:47 AM #1Cadillac Owners Fanatic
- Automobile(s): 2008 CTS4 3.6 LY7
- Join Date
- Feb 2013
So I got an 2006 CTS base and I enjoy but I wouldn't mind some more pep out of it. I got a Volant CAI already but I feel the engine has more than enough power. It just seems to me that the drive train really holds the engine back and was wondering if it be worth it replacing the 3.42 that I have in the rear with a 3.55 or 3.73? Would it make the car faster?
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- 07-29-13 03:30 AM #2Originally Posted by Acdcpsp
- 07-29-13 01:36 PM #3
Your top end will not increase. If anything it would decrease. You will be QUICKER... not faster. You will get to your top speed in less time, but your top speed will be less. Do not worry. Grabbing a CTS-V rear end with the 3.73 gears will not keep you from hitting your max fuel shut off/governor. In fact, you will get to your governed max speed sooner. But without a governor in place, your top speed will be less with lower gears.
- 07-29-13 03:39 PM #4
I've had 4.10 gears in my 01 WS6 for 8 years, and would never look back. Stock had 3.42. I have a 6 speed though, so they're perfect. I lost around 1-3mpg cruising at 60mph, but can cruise in 6th in 45mph zones which increased my mileage a whole lot. Dropped .4 in the quarter mile as well. As far as top speed, nothing to worry about unless you're racing people to 130mph+, which you shouldn't be doing anyway. You'll go thru tires a little faster too, depending on your driving habits.
- 07-30-13 10:42 PM #5
I'm not really looking to be a race car. Just be a little quicker and I do drive on highways a lot so would this cause the engine to run a lot higher? It runs 2400rpm when doing 65mph now.
- 07-30-13 11:48 PM #6Originally Posted by Acdcpsp
- 07-31-13 06:22 PM #7
3.42s are what come stock if I'm not mistaken?
Bolt ons and Bolt ins, and Bolt underneaths.
- 07-31-13 11:57 PM #8
yeah open posi too
- 08-01-13 10:51 AM #9Cadillac Owners Fanatic
- Automobile(s): 2003 CTS 3.2L manual
- Join Date
- May 2008
- Vancouver, WA USA
At 60mph he will be turning 2416rpm.
3:42 to 3:73 is approximately a 10% increase in gearing. I doubt if he would lose more than a mile or two per gallon in steady freeway driving.