71 up 2.47 to1 and 2.66 to 1
My self I always liked the 247 close ratio as a good trans to play with on the street. Also the 72 lower HP 340 cars really took advantage of the close ratio. The 70 TA and AAR's proved the better ratio spread and it was use from then on. Even the Hemi boxes were changed to 244 in 71. Mopar new they were on to something.
We used this same knowledge when racing the dirt track nationals with ATV's. We would install Dirt bike trans gears which were higher ratios then in the ATV. Instead of a hole shot in secomd as everyone did so not to shift almost instantly we would leave in the higher 1st of the dirt bike trans. The ratio change was so close it would just constantly pulled through gear changes. This is just my input from what we tried racing and street driving for many many years.
This is seat of the pants info not from paper.
Info from Brewers site.
My self I always liked the 247 close ratio as a good trans to play with on the street. Also the 72 lower HP 340 cars really took advantage of the close ratio. The 70 TA and AAR's proved the better ratio spread and it was use from then on. Even the Hemi boxes were changed to 244 in 71. Mopar new they were on to something.
We used this same knowledge when racing the dirt track nationals with ATV's. We would install Dirt bike trans gears which were higher ratios then in the ATV. Instead of a hole shot in secomd as everyone did so not to shift almost instantly we would leave in the higher 1st of the dirt bike trans. The ratio change was so close it would just constantly pulled through gear changes. This is just my input from what we tried racing and street driving for many many years.
This is seat of the pants info not from paper.
Info from Brewers site.