Magnum/727 in a early A body.

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Cuda416

Cuda416

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As I understand it, a 904 will bolt right in behind a magnum, without needing to change the driveshaft etc. If I'm not worried about the drive shaft, will a 727 fit without having to modify the tunnel?
 
Given this option, what's the best option for a replacement driveshaft. Have the existing one shortened?
 
727 in a early A body without modification? Better do some homework. I don't think so Tim.
 
Well..... maybe. If by early A, you mean 66 and earlier, then "almost" would be my answer. We put a 727 behind the 360/408 in Jake's 65. We had to flatten the seam where the firewall meets the front of the tunnel. Also had to hammer clearance the side of the tunnel just a little to clear the shifter linkage movement. Wasn't that bad. The fun part was, and maybe because of manufacturing tolerances?, we ended up splitting the top of the tunnel from the factory console mount the the firewall seam and then jacked the trans into place. It pushed the split open and we basically did a mini-tub job on the center of the tunnel to clear the back of the bell. Others have not had to do that. Good luck.
 
ragtopfury said:
Well..... maybe. If by early A, you mean 66 and earlier, then "almost" would be my answer. We put a 727 behind the 360/408 in Jake's 65. We had to flatten the seam where the firewall meets the front of the tunnel. Also had to hammer clearance the side of the tunnel just a little to clear the shifter linkage movement. Wasn't that bad. The fun part was, and maybe because of manufacturing tolerances?, we ended up splitting the top of the tunnel from the factory console mount the the firewall seam and then jacked the trans into place. It pushed the split open and we basically did a mini-tub job on the center of the tunnel to clear the back of the bell. Others have not had to do that. Good luck.
Click to expand...

Ah, ok. I appreciate the clarification. What did you do for a drive shaft?
 
ragtopfury said:
Well..... maybe. If by early A, you mean 66 and earlier, then "almost" would be my answer. We put a 727 behind the 360/408 in Jake's 65. We had to flatten the seam where the firewall meets the front of the tunnel. Also had to hammer clearance the side of the tunnel just a little to clear the shifter linkage movement. Wasn't that bad. The fun part was, and maybe because of manufacturing tolerances?, we ended up splitting the top of the tunnel from the factory console mount the the firewall seam and then jacked the trans into place. It pushed the split open and we basically did a mini-tub job on the center of the tunnel to clear the back of the bell. Others have not had to do that. Good luck.
Click to expand...

And yes, it's a 65 Valiant.
 
Cuda416 said:
Ah, ok. I appreciate the clarification. What did you do for a drive shaft?
Click to expand...

Just happened to have one the right length in the shed. No idea what it came out of. Had I not, I have a few longer ones from B and C bodies that I was going to shorten.
 
Got the old /6 and 3 speed out. Three speed and drive shaft are the flange type ball and trunnion units.

We are installing a 5.9 magnum backed by a 904 and keeping the original 7-1/4 rear for now, with plans on installing a 8.8 later. Can I just install a drive shaft from a 66 abody with a slip yoke and call it a day?
 
So, looking at the drive shaft length chart from above and this diagram...

https://www.forabodiesonly.com/mopar/attachments/rearaxledims-jpg.1714835254/

It looks like the difference in length from an 8.75 and a 7.25 rear end is 2.26". A drive shaft from a 66 valiant with a 904, in front of an 8.75 is 49.58". Looks like the final dimension would then be 51.74.

How critical is drive shaft length. If I get a drive shaft from any of these...

2533192 1967-69 2.75 51.43 904/833 7-1/4 225 273 318 Barracuda Valiant
2852161 1968-69 3.00 51.50 727/833 8-3/4 383 426 440 Belvedere
2852212 1967-69 3.00 51.53 833 8-3/4 273 318 340 383 Dart
2996137 1973-76 3.25 51.89 904/833/230 8-1/4 225 318 340 360 Duster Dart Sport
2883758 1972 3.00 51.96 904/230 8-3/4 225 318 340 Dart

which would be the best to use with our 65, 904 in front of a 7.25? I'm hoping the first one will work since I have a 69 Dart /6+7.25 car back 'round the shed'.

I'm asking here without actually measuring it because the new motor isn't in yet and if I need to go hunting for a DS, then I'd like to have it on hand when we install everything.

Any opinions?
 
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