I have recently replaced the front diff assy' in my 2001 silverado. After giving the VIN to a local spares dealer I found and had installed the new assy', but only to find now I have mismatched ratios? The part numbers are as followed.

Old                             New  
26060524                        26060524
CAV9                            CAV8
400-12681                       400-12681
NMP-7                           F-2

Pinion    Ring
10th      41th
Ratio                           Ratio
4.1-1                           ?????

Can anybody tell me this info? I'm thinking now it will be easier & cheaper to match the rear to the front?
Any info at all would be greatly appreciated.
Cheers, Frustrated.