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    Bad PCM?

    You have two grounds to the engine. Should definitely NOT be 10 or 20 ohms! ..should be close to 0. Big ground on passenger side to motor mount stud/bolt; small strap ground behind driver's side head to body at front cowl area. Make sure they are snug and clean.
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    Should I stay away from 2005 to 2008 (spark plugs)?

    Don't let old spark plug design issues scare you away! Even if the original two-piece design is in there, they will come out without breaking, if done carefully and slowly. Putting too much reverse-pressure on them while removing is what causes them to break. There's ways to do it. And, worse...
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    2006 Mustang GT Manual Convertible FBO Dyno Results

    373's are a reasonable option for both highway and 'fun improvement'. But, if you are wanting optimal MPG (with th bolt-ons, that's probably not the case), sticking with stock gears is your best option. 355's are another alternative, but not as big of a difference. I like and use 373's in my...
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    2006 Mustang GT Manual Convertible FBO Dyno Results

    yeah, but that's a slippery slope: once you do, you'll never go back to n/a! Good n/a numbers there, nice t/b, too :) @MustangMark not a bad result, though. You know how different the car feels. Don't get obsessed by the actual numbers, enjoy the car as it is, or as you tweak it. I've been...
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    Another differential whine post

    Pinion is usually growling/grinding, whine is usually backlash (differential)..from installation variances.
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    Another differential whine post

    Whine from improper backlash is usually related to certain speed ranges. If it's there, always, you have some other bearing/race issue. Could be pinion inner or outer, differential, or wheel bearings. A properly-installed set of gears will be quiet.
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    05 Mustang gt driver side axle not going in far enough

    +1, they should be different length axles; they might not be. Got to get them in on the proper side. Hopefully the other axle works out for you. Since you're there and there was some noise and problems on that one side, consider replacing the outer wheel bearings and seals. That might take care...
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    SUSPENSION REBUILD

    A few things you don't really need to replace: - upper panhard rod support brace: it's all metal OEM, no rubber bushings, no real need to replace it unless it's bent. - the sway bars can have the links/bushings replaced, but if you want to replace with new, that's up to you. Workmanship-wise...
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    Coolant smell

    Add a little coolant leak dye, run it, use a UV light at night to easily find the leak. If there is a serious leak, the coolant level will drop, so keep an eye on that. The alum t-stat housing shouldn't be leaking, but if you reused all the hoses and spring-clamps, it's possible there is a seep...
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    6R80 in my 05

    No need to "sell everything", lol. One thing I found helpful was to make sure the proper Torque Converter Type is selected (as shown in the second picture above); I had a different issue, and after speaking with tech support, went in and set the type that was appopriate for my setup. You can...
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    Ground Wire, O2 sensor, or Fuel Filter

    Good point there. Check the voltage with engine running (and off), and see. If engine off voltage is over 13 volts, it could be a battery problem. If voltage is over 14.5 volts when running, especially if over 15, the alternator is overcharging/over-voltage and that can cause all kinds of...
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    Ground Wire, O2 sensor, or Fuel Filter

    All of those are not going to go "bad" at the same time! A ground or voltage supply issue is more likely. If there was recent work such as removing the transmission or headers installed, there is probably engine harness damage and a subsequent fuse is blown. I would measure voltage at various...
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    Bushing removal and installation.

    Same as others, I've used a hole saw drill bit, or even a longer 1/4" drill bit, and drilled around the center bushing to break away the rubber area. Knock out the center with a hammer. Once out, clean out the remaining rubber; a good stiff drill-mounted wire brush bit works good. Once the inner...
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    5R55s Replacement Advice

    For a stock V6, stick with the 5r55s. A 4R70 is meant for a v8 block/modular V8, and the bellhousing is different in the 4.0L you have. Not to mention all the other changes to make one work. FWIW for those with a V8, a 6R80 is the more common and preferred upgrade now, espcially if you need to...
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    Power Steering question

    Another factor can be the type of fluid. The suggestion to replace the fluid is a good one (empty the reservoir), and fill with mercon v transmission fluid (that's right, mercon V is what the specs call for using). But, it does sound like the pump is on its way out.
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    Wiring help with 05 to 07 c110 connector gt harness auto

    It's a lot more complicated than just that one connector, and you are going to run into issues if you just swap a '07 harness into your '05, even if you replace that connector or use the '07 harness as-is. There are roughly a dozen "circuit changes" between the 2006 and 2007 transition; that one...
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    4.0-4.6 Swap

    In case you haven't seen my writeup (there's also a link in here somewhere), details on all what is needed. Getting all the parts is the biggest challenge. Finding a complete donor car is optimal, but sounds like you have a good lead on a lot of the parts already. It's pretty easy to do the...
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    Need a 2005 Mustang ECU Part #5R3Z-12A650-AFBRM

    You can also use one from a 2006. Any 2005 or 2006 manual PCM will work. You will need to have PATS programmed in it so your car will start with your keys.
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    New throw out bearing with whole new clutch kit, Rattles

    If it was the trans shaft, it should have started before changing the clutch. Did you use a clutch alignment tool when installing? Otherwise and more likely, a small shim is needed to prevent the rattle. Similar issues exist when using a larger/modular transmission with adapter plate, it can...
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    That won't work without major modifications! I know what changes are needed to get the car to...

    That won't work without major modifications! I know what changes are needed to get the car to start and everything to work; 6-10 wiring and pin changes. I converterd a '06 pcm and harness to work in an '07. For plug-and-play, you really need a '07-09 manual pcm and harness. But it can be made to...
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    Sounds like incompatible and different years of harnesses and PCM. Need more details.

    Sounds like incompatible and different years of harnesses and PCM. Need more details.
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    Weird sounds from behind AC/heater controls

    +1. One of the blend door motors is broken inside. If the noise is there upon turning on the key, it's probably the defrost or the vent/floor control. If it only does it upon temperature change, it's the blend door on lower passenger side (easist to get to). If it does it when turning...
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    Trying to remove engine, not coming off even after all bolts are out.

    A week old, but: - did you remove the top 2 bolts behind the intake manifold? - if automatic, did you remove the torque converter nuts (through the starter hole)? - are both mid-motor mount nuts removed or mounts taken out? - are both ground straps disconnected (driver side and large on on...
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    05 to 05 motor swap

    You would need to change the ring around the ignition and use a key from the car the PCM/ECU came from; of course replacing the PCM, too. At least you have a 05 to 05, no wiring issues otherwise. Another option is to change the PCM and reprogram PATS in it to recognize the keys that fit the...
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    Window wont go up

    Simple reset before replacing anything... with key-on, hold down the window switch, let window roll all the way down, holding down the button for another 3 seconds, then release button. Roll window up, holding the button; hold button 3 seconds after window has rolled all the way up, then release...

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