Mercedes axle ratios
Don't know if its any help but below are the part numbers for the different axle ratios available on my Merc 917. I think its the same axle. I knew I had posted this somewhere and eventually found it on my computer.
The part numbers are as follows:
A 383 330 16 39 RING GEAR AND PINION 40:7 This was the ratio fitted to my Vehicle
A 383 330 02 39 “ “ 42:8
A 676 330 00 39 “ “ 43:10 *** This is the ratio you want.
A 383 350 01 39 RING GEAR AND PINION 40:7
A 383 350 07 39 “ “ 42:8
A 383 350 04 39 “ “ 43:10
There theoretically are a number of other ratios 48:7, 41:6, 39:8 and 38:8 but as these are all much 'shorter' than the others, I haven’t listed their numbers. The parts are bloody expensive, Rear nigh on (UK prices) £1,000 + VAT and the front £1,274 + VAT. However, to give yourself a reasonable speed without red-lining the motor you've no option.
It is quite a tricky job to install the CW/P to set up the correct backlash. However any skilled mechanic should be able to do it. My local independent truck garage did the job easily but sadly the guy has since retired.
Hope this helps