Engine build on the brain
The car is 3200 with me in it(guessing), 4spd(may go to o/d) ,any gear needed, 30" rear tire
Finally,if considering an overdrive, absolutely forget about the Mopar box. The rpm drops between gears, at speed are waaaay too wide for a combo like yours. I tried it with two cams; the smaller was a 270/276/110 cam, and the slightly larger 276/286/110; and nearly every gear from 2.76 to 4.88, and it was just terrible; there was no way to keep the engine on the power band of a performance 110 cam. I left it in the smaller combo for about a year , but that was that.
The ratios are 3.09-1.67-1.00-.73od and the splits are 54%-60% and 73%. meaning;
that at whatever rpm you shift out of, the rpm will fall to those %s. So shifting at say 6000rpm, the Rs will fall to 3240 on the 1-2 and to 3600 on the 2-3. With 4.30s and 30s, the 1-2 would be at 47mph. At the drop to 3240 your engine better have a chitload of torque, to get back up on the cam. The 2-3 shift would come at 6000/75 mph, and your street run is already done...... so at this point nobody cares about the 2-3 drop. But at the track, your Rs would fall to 3600 on the 2-3 shift... so again, yur a solid 800rpm off the powerband. IMO, this really sucked. So I was done with it. Not to mention I blew three of them up, trying to make it work.
I hate to sound cliched but trust me, you don't want that A833 od box.
And 4.30s are probably not nearly enough rear gear with the 30s.
