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Discussion Starter #1
Hello Everyone,

I'm fairly new this site and wanted to share some experiences with my 2005 CTS-V (53, 000 miles). I recently had some parts replaced / installed and thought I would give some general feedback.
1st - I purchased the vehicle stock (24, 000 miles), with the exception of a K&N intake and Magnaflow exhaust and an unknown poly Trans mount. 2 years ago, I had a rear main leak and decided to swap the clutch setup with an LS7 and single mass flywheel and also installed the Creative Steel shifter bushings and bronze shifter linkage. I’m very happy with the results to date, the clutch feels like factory and the shifter feel firmed up and is more precise.

Last month I replaced the following: repaired a front main seal and installed a Fluidampr( huge improvement over factory), swapped out my 3rd set of factory motor mounts with a set of UMI, replaced a cracked driveshaft with a new Dorman and flex plate, Dorman rear upper control arms and RevShift rear differential bushings (black). Everything was a big improvement and very happy with the performance and better than factory feel of the car, except for the driveshaft(see below).

The UMi mounts were an AWESOME performance improvement all around and would recommend these. There was noticeable vibration into the vehicle, BUT I’m so happy with the crisp throttle response and handling, I don’t care about the vibes. The Dorman control arms improved the cornering and the outside angle of the rear wheels. The RevShift bushings greatly improved the rear end, no more clunks and no added road noise.

I am currently dealing with (2) bad Dorman drive shafts shooting out all the grease from the fittings, causing noise and leaving a greasy mess under the car. My local repair shop warranties it for 2 years/ 24K miles, but tired of bringing it back and really don’t want a 3rd Dorman shaft. We’re discussing the option of having a local driveshaft specialist rebuilding the Dorman or getting reimbursed and buying a 1-piece aluminum. I will let you know how that goes.

Thanks to all for reading.
 

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'05 CTS-V
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Welcome to the forum! That's some impressively low mileage - I've got nearly triple that on my '05. Although it sounds like the low mileage isn't saving you from the poor / mushy bushing & mount issues that higher mileage cars have to deal with, too!

The Dorman control arms improved the cornering and the outside angle of the rear wheels.
What do you mean by that?

I am currently dealing with (2) bad Dorman drive shafts shooting out all the grease from the fittings, causing noise and leaving a greasy mess under the car. My local repair shop warranties it for 2 years/ 24K miles, but tired of bringing it back and really don’t want a 3rd Dorman shaft. We’re discussing the option of having a local driveshaft specialist rebuilding the Dorman or getting reimbursed and buying a 1-piece aluminum. I will let you know how that goes.
I'm not sure I even knew Dorman was offering a driveshaft for the V. For a long time there were no stock-type replacement options out there. Where is your Dorman spewing out the grease - from the center bearing, or from the rear CV? Check out www.kerbid.com - he's got rebuild options, perhaps he can help you out.
 

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Discussion Starter #3
Thank you for the link. Both Dorman shafts threw out all the grease from both CV ends, the one right after the center bearing and the one at the diff. Looks like GM discontinued the factory shafts, leaving only aftermarket OEM and aftermarket 1-piece. I’ve been looking at the aluminum 3.5 inch offered at Driveshaft Pros and G-Force, leaning towards the G-Force. I can't wait to get the car back on the road.
 

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2006 CTS-V
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I'm really suprised about the dorman shaft.

They have a lifetime warranty, and mine went in in 2017. It's been great to me for 50k miles. The dorman giubo is a bad design, the skf 2010 Camaro SS one is the version I use with the dorman shaft. Double check the bolts that go around the CV boot, and repack it. It's a better design than stock as it's designed to be serviced.

A 1 piece drive shaft is going to cause vibration issues. For similar cash you can get a DSS 2 pc shaft or for a little bit more a Gforce.

I also love my Umi mounts! Very happy with them and they are very smooth in my car.

Have you upgraded the shifter yet? I've had both the hurst and the CS and I find the CS to be smoother and better overall of the two. The Hurst is also a great choice, but more notchy. Neither is a bad choice.

-Byron
 
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