i checked my codes, then checked again, it is GU6 for sure. does this mean i have 3.42's? reason for asking is because i thought only m6's came with 3.42's from the factory. i searched and couldnt find an answer.

 

Yes it's possible on some of the V6 A4 cars - can't remember exactly what package it was (Y86/Y87?) Look for RPO code G80 also.

 

well i have a 97 z but im positive it says GU6 on the door panel sticker, 100% positive. maybe a error from the factory?

 

Thats really weird. do you have access to something like Tuner Cats? If yours really is an Z4 97 Z with GU6 it should have different shift tables and gear ratios in the computer program..

 

Did you look for G80 or Y87?

 

no i will here shortly, ill keep ya'll posted. i think its strange too
p.s. one more thing this was my 100th post

 

okay update it says G80 as well, no Y87 or Y86. the last one says Z28 but i think thats a given. what does G80 mean and do i have 3.42's? its a auto and it sure as hell feels like i have them. thanks for the input everyone btw

 

Well Y87 was only for the A4 V6 cars after searching, sorry, should've double checked first before posting. G80 is for the limited slip/posi, not gears.

GU2 - 2.73
GU5 - 3.23
GU6 - 3.42

If the RPO is indeed GU6 check the RPM/MPH against a calculator like www.f-body.org/gears/ Maybe someone special ordered the car with 3.42's?

 

Drive 76 mph in 3rd gear (1:1), and see what the RPM is at. 3400 rpm is 3.42, 2700 is 2.73, and so on.

 

I think you're all missing the point. If the VIN on the door matches your title and your window VIN, most likely somebody converted the car to auto. They may or may not have changed the rear end when doing so. Look for the transmission code. In my case, the previous owner changed over to auto, he bought the whole auto drivetrain engine to rear end, and had 3.23's to keep it "stock". In your case, you may still have the 3.42 rear end.

 

Look for option code MM6 (6spd RPO code), if you have that, it's a 6spd car from the factory with an automatic swapped in.

If you have the M30 (4L60E code) AND GU6 in your RPO codes, that would be... well, unheard of.

 

cool cool ill go look here in a few mins. thanks

 

Yeah, something doesn't add up .

Either your door code is in fact GU5, or your car wasn't a factory auto . OR, the factory maybe an error, because LT1/4L60E/3.42 was NOT an "option" .

 

Maybe the door was changed and the sticker from donor was left on???

 

alright update it says MM6 and GU6, so it used to be a manual? is it possible to have the 4L60E with 3.42?