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R & R OF THE AOD TRANSMISSION
Submitted by SilverFox / 05-02-05

  

Pretty straight forward!
You can deal with draining it, or not. Draining can make a mess and if you slip up, you have to wallow around in tranny fluid for the next hour. At least remove what you can from the pan.



Exhaust

This is a good time to get aftermarket midpipe - you will be thoroughly disappointed when faced with putting the OEM stuff back IMHO. This is the most frustrating and time-consuming part of the R&R.
  1. Disconnect from tail section.
  2. Remove O2 sensors (if you will be replacing these - use a hammer and break them in half - much easier than trying to remove them. You can pull the guts after you remove the midpipe.
  3. Remove collector nuts (pretty tough, need extensions and small hands). The O2 sensor will be in your way.
  4. Hack the smog stuff out of your way; replace it with high heat rubber.
Tranny Removal
  1. 12 point 12mm wrench on driveline bolts (pull it) tape off ext housing to prevent fluid leakage if you haven't drained it all the way. Mark the driveline at the pinion so when you go to re-install it, you put it back exactly in the same holes - this will decrease the chances of having any driveline vibration. Technically, it shouldn't make a bit of difference but through experience I have found that it does (although I couldn't tell you why).
  2. Starter/flywheel shield/torque converter nuts (4).
  3. Reverse/park sensor/speedo gear.
  4. TV cable/shifter/tranny coolant lines.
  5. Dip stick tube (attached above with mount bolt).
Get all that crap out of your way; get it down to BARE tranny. There are 6 large bolts now holding the bell to the engine, and often some small bolts.
  1. Take the bottom ones out and the cross member bolts that hold the tranny.
  2. Use jack to support pan, remove cross member from car.
  3. Lower jack (pivot the motor/tranny down).
  4. Remove the top bolts.
  5. Jack back up to flat position. NOW the hard part - have a strong dude hold the tranny up while you remove the last 2 bolts in the middle. Once they are out, just yank - AOD is removed - but crushing your friend. I use a forklift or at best rig up a good mount on the top of your floor jack to hold the tranny instead of your friend. Weight balance is about 3" back from the front of the pan.
Make sure and use a new torque converter or have the old one flushed – they can hide a lot of crud that will destroy a new tranny. Also, clean the cooler out - same deal here. Use gallon size carburetor cleaner and a hand pump - pump into the TOP line, drain out of the bottom line.

Put the TC back on the new/rebuilt AOD - make sure there are 3 clunks - three shafts to engage. You will know when you hit the last one (tough one). The torque converter bolt lands will be 1" from the outer bell for double measure.

While the tranny is out:
  • Remove the flex plate and replace the rear main seal while you can
  • Torque the flex plate bolts properly and use lock-tite. Try to mark how the flex plate installs, so it will be easy to install it - it only goes on ONE way, so don't force any bolts
Installation

To install things is a little different - but not much.
  1. Line it up and shove it on the flywheel. The motor may be leaning forward or backward, it is only sitting on the mounts so it is easy for your assistant(s) to move.
  2. Once the torque converter bolts are through, put the middle tranny mount bolts in, tighten them snugly and put the cross member back in.
  3. NOW (or after a few more bolts) - pull and push on the TC studs and make sure the TC is LOOSE in the flywheel - you should be able to WITH EASE clunk the TC in and out against the flywheel. This is a must, and tells you that the TC is installed correctly and not bound up. If it does not do this you may not have the TC seated properly - and will destroy the front pump with one key turn.
  4. The rest is just reversal.....

TV pressure setting. I recommend 5psi at 1000 RPM, that is how to set it; there is no other way. Use any oil pressure gauge, or tranny pressure gauge. I used a mechanical oil pressure gauge out of a Nova once to check it.



I'm sure I skipped something, but you get the gist of it!



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