INSTALLING A 340 AND A 904 TRANNY HELP!!!

[4THECHALLENGE]

so im finally getting ready to install my tranny and motor. what parts would i need. so far i have a tranny, a torque converter, the motor and the car. i have a crossmember coming in .id just like to get the motor in and then worry about starting it later. but i need it to be installed ready to wire. i dont have time to remove replace and remove and replace again
thanks and sorry im loose just my firsts mopar and im a bit lost ..more like alot   

[tactransman]

............ and you don't want to put a 727 in it?

[hemiken]

  Fits in the exact same position as the 904 but a 727 is a h3ll of a lot stronger gearbox to start with.

[asm74]

My impression was that if built right, a 904 can definitely withstand a tweaked 340 and draw less HP from the crank. 

[asm74]

To stay on topic I would make sure you have the following:

Motor mounts, bolted to the engine
Towels, blankets, furniture pads to protect body and paint
A 2 ton or better engine Hoist
Adjustable leveler arm.  This is crucial to an easy install.
A good friend

The trans crossmember should be bolted to one side of the frame only, if at all, so you can slide the transmission tail shaft  through the tunnel without damaging anything.  Also, you should cover that output shaft with a rag and some tape so it doesn't scrape against anything.  Preventing damage should be the top priority, if you can't get the engine in without damaging something, get some experienced help.


 

[4THECHALLENGE]

^^^^^thanks dude that what i needed. my 904 is completely rebuilt so unless i sell it or trade even for a 727 than it wouflnt be worth it. what about flywheels i think i dont have one yet. i have the hoist and have swapped motors before ( ive done 2 chevy motors) first mopar i think i get nervous because everything looks different.
thanks guys for the input, by the way anyone in 818 or near ? and thanks asm 74

[asm74]

Flywheels are for manual trannies, you need a flexplate.  I used the B&M flex plate for small block chryslers.

It's much easier to assemble the engine-flexplate-torque coverter-tranny outside the car and maneuver the whole thing in as a single unit unless you're in a real auto shop.  Put the thing in dry too, dont put in any fluids in the engine or trans.  besides making a huge mess, it will make the whole thing a lot heavier.

If you're putting headers on this engine, you should hang them from the inner fender walls, drop the engine in over them, and then bolt them up.  You cant really maneuver the rig if the headers are bolted to the block, and putting them on after the engine is in, requires lifting the block anyways.

[4THECHALLENGE]

thanks for the points ^^^^^ ok so im gonna go buy a stock flex plate and install it then connect to the motor and drop. while headers are in already also i have the crossmember coming in from out of state do i need it now?? can i call you sith some questions asm ?? thanks man

[422STROKER]

What year is the 340?  If it is a later 340 then you will need a special flexplate for it.

I have a 904 behind my 422 right now and it seems to be holding well.  I put in a huge tranny cooler though.lol

I installed the tranny first then the engine, and depending on the headers you may need to jack up the motor, the Doug's headers didn't require that.

Leave the motor mount bolts a bit loose so you can manuver the engine in and then tighten them before you bolt up the headers(ask me how I know LOL).

The leveler makes it an easy job, I put mine in by myself with no scratches.

Take yout time, I also installed the accessories(Alternator, Pwr Steering pump, brackets etc) much easier than in the Engine Bay.

Tom

[4THECHALLENGE]

i dont know what year 340 i have. should i get the cast numbers? i have a tranny cooler and some olde headers im trying to get the car running then later i can get new headers

[422STROKER]

If it is a 72-up 340 with the Cast Crank Damper on the front you will need a special flexplate for a 904 tranny(727 for that matter) if you plan on using a nuetral balance converter.  let us know, I have a 904 flexplate from B+M that I never used if you need one. 

Tom

The Balancer will say right on it to use with cast crank, or something similar.   or it could have an aftermarket balancer with weights on it.

[4THECHALLENGE]

if i take pics and post will that help u determine what i need?
thanks

[tactransman]

If it is a cast crank 340 and you use a stock flexplate and converter,no one will show a converter for a 904/340 since they didn't come behind 340's from the factory.

This is what a stock converter for a cast 340/727 would look like as far as balance weights on the converter.

( a 904 would have to be the same weights )

[4THECHALLENGE]

the guy that rebuilt the tranny mentioned something about taking a weight off, does that mean anything??

[Jacksboys]

I would not worry about the strength of your 904 as long as you do not plan to put slicks on and go racing.  I have a 904 behind my 360 and have not had any issues.