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      03-05-2010, 09:04 AM   #14
beepbeep
Private First Class
United_States
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Drives: 2007 335i sedan E90
Join Date: Nov 2006
Location: Corrales,NM

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Quote:
Originally Posted by GreenPlease View Post
I'd be very interested in a transmission cooler upgrade. Are we sure that's all the AT needs? Doesn't our ZF unit also have clutch packs or some sort of mechanism that initiates torque converter lock up?
The 335 AT locks up in all gears, once you are moving. Any heat is produced by gear contact friction (drive line friction losses, just like a manual) not by fluid slippage in a torque converter.
Cheers