Transmission Change
Thread Starter
Newbie
Joined: Sep 2017
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2005 MB CL55
Transmission Change
I have a 2005 CL55 and wondered if the MB 7-speed transmission would fit and function in the car in lieu of the current 5-speed? I'm also thinking of installing an underdrive pulley for added hp.
Senior Member
Joined: Jan 2007
Posts: 309
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From: Central Pennsylvania
1994 S420 RIP (2/8/13), 06 CLS55, 02 ML55, 94 TT Supra, 89 Maserati 228, 911 Porsche Carerra
The 722.6 5 speed transmission is more powerful and can handle more torque than the 7 speed and the 7 speed is loaded with problems mostly valve body. That's why the CLS 500 has the 7 speed but the CLS 55 AMG has the five speed. And it's bulletproof. Probably the best transmission ever produced by MB. Don't ask for a real expensive headache.
