you know that a 360, basically, is just a stroked 340, right, with lighter-weight pistons.
For a STREETER
If it's gunna be a DD, the factory340 cam is a pretty thirsty item.
If it's gunna be a DD, you'll likely want to run 2.94s or less.
A 340 with a factory cam, and with an A904 with a factory 318 convertor, and 2.94s; is gunna be a lil pokey to get moving. I would totally trade that 340 away, for a 360 with a near-stock cam. The 360 will be way more fun to drive, especially with a ThermoQuad. and even more fun with a lil more stall. and you won't be forced to memorize the locations of every gas-station in town.
The factory340 makes about the same, or less torque, than an Early 318, at low rpm. So, a 904 built for a 318, will easily endure whatever a factory 340 can dish out..
I have to keep saying streeter and factory in order to not incur the wrath of the resident gurus, who seem to just be out for my blood these days.
BTW
Of all the Mopar small-block transmissions I ever ran, the ones out of the 71 Demons, I loved the most. I was so enamored of those, I took one out, stripped it down, and made THREE copies. I put one of the copies back in and drove that car until it was too rusty, too ugly, and too tired, to keep on trucking. I stripped it out and kept the copy. I put one of the copies in my old 73 Dart, and drove it to death. Not sure if I kept the copy, but I think I did. One copy is currently in my Son's D100, and he loves it.
The original, was reconditioned back in ~77/78, kept as my reference, and hasn't ever turned a mile since
If I remember right the 904 will take the same driveshaft, as both the 904 and 4 speed are shorter than 727.
Maybe but the 904 has the smaller diameter output shaft/slip-joint/and 7260 joint; whereas
the A727 and A833 share the larger splines, yokes, and 7290 joints.
And so, the driveshafts are all over the place.
The yokes on the driveshafts are usually the same at both ends, but you can't mix joints; it's one or the other.
Pinion yokes have to match what's on the Driveshaft. and
The yokes also have to match the number of splines on the pinions.
If you make a mistake in parts selection anywhere, you could end up having to procure a custom driveshaft.
The only exception is the slanty-4-speed which had the smaller, A904-sized slip-yoke, a matching 7260 U-joint driveshaft, and the same-sized Joint/and pinion-yoke, on the back.
Therefore, my best guess when going from an A833 NON-overdrive, to an A904, you will need to change everything from the back of the trans, to at least the rear U-joint, on account of you can buy an adapter U-joint with one pair of each sized cups.
HOWEVER; IDK anybody that can predict which factory driveshaft will fit.
Is this a big deal to OP?
Well that depends on what yur timeframe is. Otherwise, it's just finding the parts.
