Thread: 727 or turbo 400

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Nice to see another old HEMI guy.

Both are good heavy duty transmissions in stock form and well supported by the aftermarket with HD parts. I've had good luck with both.

A couple of considerations that you might look at.

Though not much different, I believe the main body of the 727 might be a little smaller than the TH400 which might make it a little easier to get under the floor boards of the car.

Depending on the mods to the tranny, the TH 400 usually requires a vacuum source for the modulator, where the 727 does not use a modulator. (Which might be a consideration in a blown application).

Shift points on the 727 are controlled by the kick down linkage and it is critical to have it properly adjusted to prevent flaring between shifts and burning the tranny up.

If length is a concern with the 727, there was a version (usually found in motor homes) with a very short tail shaft (I believe it cut well over a foot off the length of the tranny). I've only seen these units in the BB case, however as the SB and BB 727 use the same internals the short output shaft and housing can be bolted into the SB unit.