Conversion:318/904 to 340/727

Posted By: cudagerry

Conversion:318/904 to 340/727 - 01/04/10 06:48 PM

I do not have a flex plate or torque converter for the 340/727.

Will the ones from the 318/904 work? (This is a fairly mild 340 build.)

Oh, and what about the trans shifter linkages, are they the same?

Posted By: 540challenger

Re: Conversion:318/904 to 340/727 - 01/04/10 07:57 PM

Quote:

I do not have a flex plate or torque converter for the 340/727.

Will the ones from the 318/904 work? (This is a fairly mild 340 build.)

Oh, and what about the trans shifter linkages, are they the same?

The flexplate will bolt on the motor.

But the bolt pattern on the convetor might be different

The B/M flexplate is a nice fix for that. uit has both bolt patterens on it.

The convertor won't 904 and 727 use have different amount of splines on the input shafts.

Also what year 340? some were internal others were enternally balanced.

the shift linkage will work on both 904/727

also the drive shaft will nned a new yoke and to be cut down. The 727 is longer and has a different spline.

Posted By: Reggie

Re: Conversion:318/904 to 340/727 - 01/04/10 08:03 PM

Driver's side block mounting lugs are a bit closer together on a 340 but they can be adapted to the 318 bracket with either a spacer or washers.

Posted By: DragDart360

Re: Conversion:318/904 to 340/727 - 01/04/10 10:41 PM

Why not just use the 904 and existing parts and you have a bolt in assembly? The 904 will easily handle most street driven 340's.

904 Equipped

Posted By: cudagerry

Re: Conversion:318/904 to 340/727 - 01/05/10 01:17 AM

Now that's a thought. I have a rebuilt 727, I guess I could just refresh the 904, it was working fine other than the typical leak(s).

Then, if I wanted, I could put in the 8 3/4 rear and the 727 at the same time.

It's for a 70 Barracuda, I guess I just always had it in my mind that the 727 and 8 3/4 was the way to go for the higher performance applications.

Say, doesn't the 904 have a shorter 1st gear ratio also?

Posted By: scratchnfotraction

Re: Conversion:318/904 to 340/727 - 01/05/10 02:52 AM

yes it does...takes less HP to turn the 904 also

wouldnt use a lopo lock up 904 for a performance rig though

A999 from a truck/van/cop car/5th ave would be a heavy duty unit