1985 Dodge Truck swap

  • 1985 DODGE TRUCK
  • 150,000 MILES
I have a 318 motor 727 trans. Swapping for a 360 motor same trans. Besides harmonic balancer and torque converter both with added weights supposedly. What else do I have to do for a clean swap. Its a 4x4.
Do you
have the same problem?
Wednesday, July 31st, 2013 AT 4:41 PM

1 Reply

There aren't many people around who remember that the 340 and 360 are externally balanced and need those weights on the vibration damper and torque converter. The 360 may have come with a larger radiator but as far as the engine installation anything you read will tell you a different front cross member is needed because the mounting ears cast onto the left side of the block are different. The 273 / 318 use one cross member and the 340 / 360 use a different one. I did this swap many years ago but I dumped in a 340 in place of a 318. All I had to do was reposition the left engine mount bracket. As I recall the metal bracket sat in front of the three ears on the block and I moved it to the back of the ears. That moved the rubber mount back about 3/4" and it dropped right into the hole in the pedestal on the cross member.

The right engine mount is the same so be sure to bolt the bracket to the block the same way as on the 318.

Most 318s came with the 904 automatic transmission. You can put in the much more desirable and beefy 727 but it has to be for a small block engine. Everything will mount and connect identically, but I don't know what to tell you with a transfer case. In the cars you just need a 4" shorter drive shaft.
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Wednesday, July 31st, 2013 AT 8:02 PM

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