MiltonV Posted March 21, 2023 Report Share Posted March 21, 2023 Hi, I got a J63 transmission and disassembled it to rebuild, so I took the time to count the teeth and figure out the relation of each compared to a ordinary F4w63 J63: 36 15 30 21 27 29 20 33 F4W63: 36 14 31 20 26 27 20 33 As I can see 4th are the same but the rest vary so, what you guys think? What advantage shows one over the other? Quote Link to comment
datzenmike Posted March 21, 2023 Report Share Posted March 21, 2023 There are no gears involved with 4th. Fourth is a straight connection between clutch and drive shaft. 33/20 are the first gears on the mainshaft and the countershaft below it. 33/20 is 1.65 and applied to all forward gears (with the exception of 4th) 36/15 is most likely 1st gear so 2.4 X 1.65 (the input gears that are common to all forward gear) making first a 3.96 ratio 30/21 = 1.42 X 1.65 = 2.35 2nd 27/29 = 0.93 X 1.65 = 1.53 3rd Fourth gear is always 1 to 1 or 1.00 1st... 3.96 2nd.. 2.35 3rd... 1.53 4th... 1.00 First gear in the J13/L16 powered 521 is 3.657, same as the 510 wagon. The sedan is 3.382* first. * This is accomplished by varying the 33/20 gear set at the front of the transmission. Quote Link to comment
MiltonV Posted March 21, 2023 Author Report Share Posted March 21, 2023 10 minutes ago, datzenmike said: There are no gears involved with 4th. Fourth is a straight connection between clutch and drive shaft. 33/20 are the first gears on the mainshaft and the countershaft below it. 33/20 is 1.65 and applied to all forward gears (with the exception of 4th) 36/15 is most likely 1st gear so 2.4 X 1.65 (the input gears that are common to all forward gear) making first a 3.96 ratio 30/21 = 1.42 X 1.65 = 2.35 2nd 27/29 = 0.93 X 1.65 = 1.53 3rd Fourth gear is always 1 to 1 or 1.00 1st... 3.96 2nd.. 2.35 3rd... 1.53 4th... 1.00 First gear in the J13/L16 powered 521 is 3.657, same as the 510 wagon. The sedan is 3.382 first. But compared to the f4w looks like 1st 2nd and 3rd are faster in the 63L? Quote Link to comment
datzenmike Posted March 21, 2023 Report Share Posted March 21, 2023 The higher the number the more revs at the same speed. A 3.96 first will accelerate faster than the 3.382 from a 510 sedan. Up to a point. 1 Quote Link to comment
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