72 Dart Hemi swap

[mrploww]

I am helping my sister try to gather up what all would be needed to do a 5.7 or 6.4 swap into her 72 Dart. Currently a 318/904 with an 8 3/4 rear. Transmission is a big question. Yes, can go with a 727, but would be really nice to have OD. We would also like to keep from modifying the tunnel, so that might keep our options low. Gear Vendors on a 727? Or GM 4L60? Do those fit without modification? If we keep the stock front suspension, can you run headers or is clearance an issue? I know there are kits with unlocked computer and harness. I will take any advice you all can give so we can get a rough idea of cost.
Thank you so much for guidance!

 

[408 swinger]

I have no experience with the overdrive options. You can use the 904 or a 727. The stock suspension with headers is tight. You'll be limited to stock manual steering box with the big tube tti. A Borgeson may clear with smaller tube(1 3/4), maybe someone can chine in on that one. As for electronics, do you want infinite adjustment, or just something to plug and play and go? For the plug and play, I have had fantastic experience with hotwireauto.com.

 

[DionR]

Pretty sure a 200R4 can be made to work without much surgery. I think still some but the smallest I know of outside of an A833OD swap.

I haven't read the thread but maybe this would a useful read? 200R4 vs A518 vs Keisler A41 fitment

Or maybe this one? Any companies selling complete small block overdrive transmission assembles?

Even the GV needs an bump out in the driveshaft tunnel.

 

[RSM]

The driver side header is a tight fit on my 71 Demon. I went with the 1 3/4" Tti headers on the 5.7 and I actually have to remove the torsion bar to get that header in/out. The passenger side fits great with no issues. I have a built 727 and was going to do an overdrive swap but didn't want to mess with the tunnel mods. From what I understand, the Gear Vendors only require a little hammer work in the tunnel for clearance. I would like to do a GV but they aren't cheap and the driveline will need to be shortened. Currently I have 4.10 gears in the car with a 26" tall tire and the rpm's are 3400 @ 65 mph. I plan on going to a 285/70-15 tire which will drop the rpm to about 2900 and with a GV it would drop to about 2300 rpm @ 65.

 

[racerjoe]

I am helping my sister try to gather up what all would be needed to do a 5.7 or 6.4 swap into her 72 Dart. Currently a 318/904 with an 8 3/4 rear. Transmission is a big question. Yes, can go with a 727, but would be really nice to have OD. We would also like to keep from modifying the tunnel, so that might keep our options low. Gear Vendors on a 727? Or GM 4L60? Do those fit without modification? If we keep the stock front suspension, can you run headers or is clearance an issue? I know there are kits with unlocked computer and harness. I will take any advice you all can give so we can get a rough idea of cost.
Thank you so much for guidance!

If you don't want to modify the tunnel, just run a 2.76 or 3.23 rear gear with a 727 or 904. That's the cheapest option.

 

[DionR]

If you don't want to modify the tunnel, just run a 2.76 or 3.23 rear gear with a 727 or 904. That's the cheapest option.

And a 999 with a 2.74 first gear and a 2.76 would feel like a standard 904/727 with a 3.23 out of the hole while 60mph with a 26' tire would be like 2200 rpm. Not a bad option for a cruiser.