Billy, How did your install go? Did you have to modify the trans tunnel and did you use a kit with the offset shifter?
I think a 3.23 with the 2.87 1st gear would be a nice combo for you, nearly the same as a 3.73 with a 2.43 1st gear of the BW.
If your Radial T/A's are more than a couple of years old, they get hard and don't hook well at all, especially with your current combo of 3.90 x 2.87.
Btw, how would you rate the Tremec?
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'79 T/A 6.6 4-sp, 3.23 , 463" E-heads, 252/262 hyd roller, TII, Holley 830, 8.384 @ 93.86 - 1/8, 12.5 @ 116 - 1/4, 2.035 60', 3800 lbs. w/o driver
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