W211 AMG Discuss the W211 AMG's such as the E55 and the E63
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Renntech Transmisson Upgrade

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Old 04-08-2008, 11:09 PM
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08 CLK63 BS
Renntech Transmisson Upgrade

Hey guys,

I was wondering if anyone got the Renntech tranny upgrade. Would it have any noticable effect on a stock e55 or does it only become useful after the car is heavily modded? I really don't like the stock e55 tranny too much and I'm looking for ways to improve it.
Old 04-08-2008, 11:11 PM
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E63 P30, CL500 Sport
Originally Posted by slacker55
Hey guys,

I was wondering if anyone got the Renntech tranny upgrade. Would it have any noticable effect on a stock e55 or does it only become useful after the car is heavily modded? I really don't like the stock e55 tranny too much and I'm looking for ways to improve it.
Are you talking about the TCU upgrade or actual transmission modification?
Old 04-08-2008, 11:17 PM
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08 CLK63 BS
Originally Posted by MB_Forever
Are you talking about the TCU upgrade or actual transmission modification?
I'm not sure. I just see the item below on the Renntech w211 price sheet.

Transmission upgrade $2495
part No. 322110092


Is that the TCU or the actual Transmission?
Old 04-08-2008, 11:27 PM
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E63 P30, CL500 Sport
Originally Posted by slacker55
I'm not sure. I just see the item below on the Renntech w211 price sheet.

Transmission upgrade $2495
part No. 322110092


Is that the TCU or the actual Transmission?
Transmission Control Unit (TCU) upgrade is a simple flash and is easily reversible. I just looked at it as well, but I'm not sure if it is a TCU upgrade or not. Usually, RennTech's price sheet will state a TCU upgrade on their price list for TCU upgrades, which makes me think that this is some kind of transmission strengthening procedure for the extra power different from TCU

I'd call them tomorrow and get more details.....
Old 04-09-2008, 08:37 AM
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CLK63 Black, E350 Wagon, Supercharged Denali, Lotus Elise, Tesla Model 3 Dual-Motor.
I have the Renntech trans upgrade and it's worth the money if your really upgrading the engine for more HP. They remove & beef-up & reinstall the trans.
Old 04-09-2008, 11:35 AM
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Originally Posted by MACHC5
I have the Renntech trans upgrade and it's worth the money if your really upgrading the engine for more HP. They remove & beef-up & reinstall the trans.
For only $2500? Seems like a bargain to me. What exactly to they change?

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