E30 Zone

hi does any one kno how to identify a close ratio sport gearbox?

i know HM is a late sport box & NM is early sport gearbox codes but what about NZ & BS are they also close ratio sport gearboxes does any one know ??

hm and nm are sport boxes for sure but the only way to really tell is take the numbers off the box and phone parts at bmw they will tell you, As some of the sport boxes have no letters.

i know ANB is not a sport box but what about TNN ...??

hands wrote:i know ANB is not a sport box but what about TNN ...??

TNN is a sport box too.....