OD is actually HIGHER on the ZF5 than the ZF6


S42 ZF5
Close Ratio
1st Gear:
4.14
2nd Gear:
2.37
3rd Gear:
1.42
4th Gear:
1.00
5th Gear:
0.77
Rev Gear:
3.79

S47 ZF5
Close Ratio
1st Gear:
5.08
2nd Gear:
2.60
3rd Gear:
1.53
4th Gear:
1.00
5th Gear:
0.77
Rev Gear:
4.66

ZF6


Low:
5.79
1st Gear:
3.31
2ed Gear:
2.10
3rd Gear:
1.31
4th Gear:
1.00
5th Gear:
0.72
Rev Gear:
5.23

courtesy of diesel brad

 

OD is actually HIGHER on the ZF5 than the ZF6


S42 ZF5
5th Gear:
0.77


S47 ZF5
5th Gear:
0.77


ZF6
5th Gear:
0.72

While you are correct the number is higher, it is less overdrive. a zf5 at the same speed with run a higher rpm than a zf6. The zf6 has MORE overdrive, thus runs lower rpms at higher speeds.

 

sorry i just copy and pasted from a post a few months back and didnt think to reread the whole thing