I was talking to a chap from Oregon asking him about the required trans / torque converter upgrades for the 425 over the existing 307 in my 86 brougham d`elegance .Below ,verbatum , is his reply


"you will need to check to see if you can mount that 425 to the 2004r also i am not sure the pilot on a 2004r converter will go into a 425
you will need to do some research to make sure it will work"


Can someone please explain ? I can`t see why the 425 and th200 4r would be incompatible
cheers
mike

 

Should bolt right up. It won't last long unless you throw some money at it first though.

 

svnt442 ,

tx buddy n yes I guess the reason for contacting the trans guy was to beef it up a bit
cheers mike

 

Make sure you have the metric bolts for TQ converter & check to make sure there are flywheel holes in the right place to accept the TQ. I have this distant thought there might not be a correct set of holes. Then again I might be hallucinating. Make sure that trans is either in good shape & from a performance model - preferrably a GN or alternatively a 442, Monte SS, etc. Even those units will be on borrowed time w/ a 425, but the lesser units will be toast in short order if you use your right foot much. At least put a shift kit and a HD second gear servo to give yourself a chance.

 

The correct response is WILL bolt right up...

Note that the 425 (and all 64-67 motors) have a different crank flange bolt pattern than the 68-90 motors. You will need the correct flexplate for the 425.

 

Joe, tx yes thats the answer and fortunately I do have the flex plate that came with the 425

BTW
The trans will ofcourse be getting a complete upgrade to handle the torque . Even my blissful ignorance has this one covered.
mike

 

What about a 4160e ...

With the electronic shift could you hook up paddle shifters ..?

 

The 4L60E has the same problems as the 700R4 on which it is based - no BOP bellhousing and not strong enough in stock form to survive behind a BBO.

Personally I don't see the attraction of paddle shifters anyway. Give me a dual gate, or better, a manual trans, but of course that's just my preference.

 

I sure agree on the paddle shifter. Not worht the hype. I like the ratchet shifters for Auto trans. Used a B&M Quicksilver for years and years. Beat it to death and wore it out, called B&M and they happily sent me a rebuild kit for FREE and took me about 20 minutes to put in the new parts, and never wore it out after that and ended up selling that ride with the shifter included.

 

I thought the ease of mounting would be nice and a clean hump with no shifter or console would be very declasse ...

 

So you are trying to bring back the old push button automatic Dodge idea, using paddles instead. Might be a nice idea to at least try.

 

months after I sold my Polara I would paw at the dash trying to shift ...