That’s because there was no such bulletin. I have taken apart a number of original 300 transmissions, and none ever had a 5 disc clutch. If you leave parts out of the drum, you will get a harsh engagement, and the lower plate will be so far down, it will not be splined to the hub, so you would get no advantage anyway. I have pretty much all of the factory service bulletins, and have never seen any reference to this.
Long ago I had a conversation with George Rihel. He said Chrysler had a bulletin that 300 cast iron TF should have front clutch converted to 5 discs. You need to remove the cushion spring and top plate and install standard plate, (no tabs) and add the fifth disc. I have not seen that bulletin.
The trans is identified as a 466, not 488.
There is no such thing as a 5 disc clutch in a 300 torqueflite. The only time they had a 5 disc was 56, and that one had no torque multiplication in the apply levers. It was changed in 57 to the 4 disc.
The 300 F trans has a higher line pressure than standard units, a low tension spring in the rear clutch, a higher ratio kick down lever, and a high speed governor package. The line pressure is about 10 pounds more than a standard unit. You should be fine as long as the shift cable and kick down linkage are adjusted right.
Hi all 300es
Posted by: <dverity@xxxxxxxxxxx>
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