IS THERE ANY AFTER MARKET CO MAKING DIFFRENT GEAR RATIO FOR 06 MAGNUMS ???

 

not yet.

 

AMG in Germany can supply both differential gears
and individual gearsets for the automatic transmission
but the prices are 'Mercedes High'

If you can find some wrecked Mercedes vehicles in junk yards
if might be possible to swap parts
since there are several versions of the trans with interchangeable gearset.

archived info on auto trans in Magnum:
====
Mercedes-Benz transmissions used in:

ML230
ML320
ML430
ML55
ML270CDI
ML270CDI

5 sp manual
5 sp auto
5 sp auto
5 sp auto
5 sp auto
6 sp manual

transmission type designation

GL76/29B-5
W5A330
W5A 580
W5A 580
W5A 580
NSG 370 *

max. torque input
202 lb / ft
275 Nm

242 lb / ft
330 Nm

426 lb / ft
580 Nm

426 lb / ft
580 Nm

426 lb / ft
580 Nm

272 lb / ft
370 Nm

1st
3.856 :1
3.951 :1
3.595 :1
3.595 :1
3.595 :1
5.014 :1

2nd
2.183 :1
2.423 :1
2.186 :1
2.186 :1
2.186 :1
2.831 :1

3rd
1.376 :1
1.486 :1
1.405 :1
1.405 :1
1.405 :1
1.789 :1

4th
1.000 :1
1.000 :1
1.000 :1
1.000 :1
1.000 :1
1.256 :1

5th
0.799 :1
0.833 :1
0.831 :1
0.831 :1
0.831 :1
1.000 :1

6th
0.828 :1

reverse
4.218 :1
3.147 :1
3.167 :1
3.167 :1
3.167 :1
4.569 :1

torque converter ratio
1.85 :1
1.80 :1
1.80 :1
1.80 :1

weight
31.8 kg
76 kg
80 kg
80 kg
80 kg
40.5 kg

previous versions
W 5A 300
W5A 400