Dblair

Well-known Member
can anyone tell me what rear ratios were offered in a Oliver 66 ? I'm looking for a ratio to match a Oliver super 66
 
You will not find an exact match if you run both engines at maximum RPM's

The 66 row crop had a regular speed transmission. They also had a slow speed transmission as an option. The engine was set at 1600 RPM's

When the came out with the Super 66 they increased the RPM to 2000. Because of the higher engine RPM's and to make the field speeds close to the other models, that model only used the slow speed transmission..

The 66's regular transmission was not used in the Super 66 Row Crop.
 
   What Oliverfan states is correct.   Earliest tractors up to S/N 420 150 had a 13/50 set: 3.84-1 ratio.   S/N 420 151 to 4505123 had a 11/47 set: 4.27-1 ratio.   Special low transmission code C-66-F and the Super 66 and 660 Code 606 all had 9/46 set: 5.11-1 ratio.

   Standard 66 through S/N 470 405 had 15/46 set: 3.06-1 ratio, S/N 470 406 & later had 14/45 set: 3.21-1 ratio.

   Earliest Industrial through S/N 462 050 had 13/50 set like early Row Crop then S/N 462 051 had 11/47 set, however they had high speed 5th & 6th gears on the transmission pinion shaft, this set can be installed, however it requires complete disassembly.
 

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