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55blacktie · 03-01-2022, 12:59 PM

My 55 Tbird/w 2.72 gears is not back on the road yet. However, my 1988 Mustang 5.0/w AOD had 2.73 gears. Although it could barely break the tires loose/w limited slip and stock 225/60R15 tires, it had no trouble breaking out. As far as my Tbird is concerned, a C4 transmission/w Dynamic Racing Transmission's C4 wide-ratio gear set is replacing the Fordomatic. The gear set has 2.90 1st, and 1.60 2nd. The 2.90 1st/w 2.72 rear gears is equivalent to a Fordomatic's 1st/w 3.29 rear gears. The original Tbird Dana 44 ratio is 3.31, behind the Fordomatic. I have 215/70R15 tires. The calculated RPM at 65 mph/w 2.72 gears and 215/70R15 tires is approximately 2200.

03-01-2022, 12:59 PM	#20
55blacktie BANNED Join Date: Aug 2020 Posts: 529	Re: Dana 44 2.72:1 ring & pinion My 55 Tbird/w 2.72 gears is not back on the road yet. However, my 1988 Mustang 5.0/w AOD had 2.73 gears. Although it could barely break the tires loose/w limited slip and stock 225/60R15 tires, it had no trouble breaking out. As far as my Tbird is concerned, a C4 transmission/w Dynamic Racing Transmission's C4 wide-ratio gear set is replacing the Fordomatic. The gear set has 2.90 1st, and 1.60 2nd. The 2.90 1st/w 2.72 rear gears is equivalent to a Fordomatic's 1st/w 3.29 rear gears. The original Tbird Dana 44 ratio is 3.31, behind the Fordomatic. I have 215/70R15 tires. The calculated RPM at 65 mph/w 2.72 gears and 215/70R15 tires is approximately 2200.