1965 Auto Transmission Swap
I have a 360 stroked/ported etc. to a 410. I was told the early Dak tranny would be a better for mileage withe the added 4th gear.
that will depend on your cam. A long-period cam will not be efficient at low rpm, and you might end up spending a lotta money with poor results.
For me with a stock stroke 367, the changeover happened going from a 223* cam to a 230*.
The 223 did well to under 1800 rpm.
the 230 is lousy at 2200.
Because you have a "big" engine, and a Convertor, there is no good reason to run race gears. And therefore, no good reason to run an overdrive.
If this is a streeter, I would just get a good TC and run 3.23s or less. The stall will depend mostly on two things; the engine's cylinder pressure, and the amount of tirespin you want,lol.
In a streeter, you can't run second gear out to the top,without speeding,anyway; and with a lightweight-A, finding traction will be the biggest challenge. So nothing wrong with running 3.23s
3.23s will get you 65=2880@zero slip, with a 77" rollout or 24.5" tires and a regular 904/727. The Mopar overdrives would knock that down to .69, or ~2000rpm.
A 230* or bigger cam, is not gonna like 2000; 2500 maybe; And that points to: 2.76s for 65=2460, or 2.94s for 65=2620
Of course that will soften your off-the-line hit, and so require a higher stall to solve.
IMO, a better solution is an A999/A998; these can be had with lock-ups and gears of 2.74-1.54-1.00 which your stroker can easily pull.
Say you run the
2.94s. and 65=2620 in loc-up. Your new starter gear is 2.74/2.45= about 12% better, making the 2.94s feel like 3.29s. And 1.54 second will hit 65 at 4040/ zero-slip;say 4300 to 4400 at WOT.
To run the overdrive at the same 65~2620, you would need 4.30s for 65=2650, or 4.10s for 65=2530. Say you went with the 4.10s. With the A500 this would get you the 2.74 low so a starter of 11.78. This is a race-starter. Second would be 6.31 and
65~6000 at WOT. Very nice with the right camshaft.
With the A518, you get the standard gears of 2.45-1.45-1.00, and so a starter of 10.05, and
65=5800 at the top of second at WOT.
In either case with 4.10 x.69 cruiser gear,
65=2530 in loc-up.
In any case;
with the A500/A518/727, you will have to cut the floor apart and reposition the tail higher, to get a decent shot at correcting your driveshaft U-Joint angles.
And all the things in Post #2 still apply. Plus
"small" bucket seats will be required, and
just try stuffing headers in that Early-A, lordy, lordy.....
You might be able to talk me into trading your 65 for my 68 ........
But there is another option,namely; the GVod. This little gem bolts onto your A904, after you replace the rear extension. This will allow you to leave the front pan alone, but you might have to make a lil room between the buckets, for the unit; my 68 only needed a couple of whacks. And I needed to raise the back of the trans to get a decent U-joint angle.
This unit has a .78 overdrive ratio. So to run about 65~2620 you would need 3.73s for 65=2590 at zero slip, could be 100 to 150 higher depending on terrain.
Top of second with 3.73s is 65~5300@WOT, Looks pretty good. Your starter is 9.14,very nice for a streeter.
Your stroker should not need 3.73s;
3.55s would reduce all your rpms by about 9%. But 3.73s finish up second gear pretty nice with say a 220/225 cam.