A method of replacing a scavenge/charge pump drive gear comprising the steps of: a) removing an existing scavenge/charge pump drive gear from an integrated drive generator having an input shaft, a gear differential including a carrier shaft and the gear differential including a ring gear for driving a generator, said ring gear also connected for driving an accessory drive gear, said accessory drive gear being connected for driving said existing scavenge/charge pump drive gear to, in turn, drive a charge pump through a shaft; and b) replacing the existing scavenge/charge pump drive gear with a replacement scavenge/charge pump drive gear including a gear body extending between a first end and a second end and having a disc extending radially outwardly, and a boss extending from said disc toward said second end, there being outer gear teeth outwardly of an outer diameter of said disc, characterized by said outer gear teeth having a gear tooth profile with roll angles at points A, B, C, and D, and the roll angle at A for said outer gear teeth being between 20.9 and 22.3 degrees, the roll angle at B for said outer gear teeth being between 22.7 and 24.2 degrees, the roll angle at C for said outer gear teeth being between 28.2 and 29.7 degrees, and the roll angle at D for said outer gear teeth being between 30.0 and 31.5 degrees, wherein the roll angle at A is at the form diameter, roll angle at B is 20 percent away from the roll angle at A and between roll angle at A and roll angle at D, and wherein roll angle at C is 80 percent away from roll angle at A and between roll angle at A and roll angle at D, and wherein the roll angle at D is at the outer diameter of the gear tooth, and wherein said outer gear teeth have a pitch diameter of 7.87 centimeters (3.10 inches) with a tolerance of +/-.025 centimeters (.01 inch), wherein there are 62 of said outer gear teeth, and wherein there are eight spline teeth within a bore in said boss; wherein said outer gear teeth have a maximum form diameter of 7.62 centimeters (3.00 inches) with a tolerance of +/-.025 centimeters (.01 inch). a) removing an existing scavenge/charge pump drive gear from an integrated drive generator having an input shaft, a gear differential including a carrier shaft and the gear differential including a ring gear for driving a generator, said ring gear also connected for driving an accessory drive gear, said accessory drive gear being connected for driving said existing scavenge/charge pump drive gear to, in turn, drive a charge pump through a shaft; and b) replacing the existing scavenge/charge pump drive gear with a replacement scavenge/charge pump drive gear including a gear body extending between a first end and a second end and having a disc extending radially outwardly, and a boss extending from said disc toward said second end, there being outer gear teeth outwardly of an outer diameter of said disc, characterized by said outer gear teeth having a gear tooth profile with roll angles at points A, B, C, and D, and the roll angle at A for said outer gear teeth being between 20.9 and 22.3 degrees, the roll angle at B for said outer gear teeth being between 22.7 and 24.2 degrees, the roll angle at C for said outer gear teeth being between 28.2 and 29.7 degrees, and the roll angle at D for said outer gear teeth being between 30.0 and 31.5 degrees, wherein the roll angle at A is at the form diameter, roll angle at B is 20 percent away from the roll angle at A and between roll angle at A and roll angle at D, and wherein roll angle at C is 80 percent away from roll angle at A and between roll angle at A and roll angle at D, and wherein the roll angle at D is at the outer diameter of the gear tooth, and wherein said outer gear teeth have a pitch diameter of 7.87 centimeters (3.10 inches) with a tolerance of +/-.025 centimeters (.01 inch), wherein there are 62 of said outer gear teeth, and wherein there are eight spline teeth within a bore in said boss; wherein said outer gear teeth have a maximum form diameter of 7.62 centimeters (3.00 inches) with a tolerance of +/-.025 centimeters (.01 inch). wherein said outer gear teeth have a pitch diameter of 7.87 centimeters (3.10 inches) with a tolerance of +/-.025 centimeters (.01 inch), wherein there are 62 of said outer gear teeth, and wherein there are eight spline teeth within a bore in said boss; wherein said outer gear teeth have a maximum form diameter of 7.62 centimeters (3.00 inches) with a tolerance of +/-.025 centimeters (.01 inch).