AAR T/A 4 speed

[cudasteve72]

Is there anything different in a aar or t/a 4 speed than a regular non hemi 4 speed?

[ShelbyDogg]

The gears were all closer and evenly spaced out to each other, than the regular 4 speeds for road racing. But it looks like everything after 71 had the same gears, except for 318s.  Might have to look for case part numbers to tell them apart. Don't ask me for those. If you had to, you could probably put a clutch disk on the splines, a yoke on the tail, and count revolutions in each gear, so you don't have to open the side cover.

My book shows gear ratios:
                   for 1970 an earlier as.............     2.66, 1.91, 1.39, 1.00
For 1970 Trans-Am-AAR AND 1971-1974 .......... 2.47, 1.77, 1.34, 1.00
for 1965 6-cyl and 1974-1975 318 ..........         3.09, 1.92, 1.40, 1.00
1975-1980 Overdrive..............                        3.09, 1.67, 1.00, .73

These were for SMALL SPLINE, fine pitch gear trannies

Rob

[cudasteve72]

Which would you say is the best.  I am planing on having like 450 horse and may bring it to the track.  what would the differences feel like

[ShelbyDogg]

The 3rd one down has the lowest 1st gear for launching and getting out of the hole, but 2nd gear is spaced farther away than the first 2 on the list. I guess having evenly spaced gears like number 2 would be good for keeping you in the power band with every gear change.  Stay away from the OD for racing. It's sometime like shifting from 1st- 2nd- 4rth  and not good for racing but great for cruising.

Rob