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Messages - Smirdok

2
Engine Tech / Would love some advice on a potential Turbo T-bird
Hello to all! I would be forever grateful if I could get some advice on a T-bird Turbo Coupe for sale. I currently own an 87' 5.0L SO as my daily driver (couldn't afford any mods due to being in college) so I know very little (as in next to nothing) about the turbo coupes. Through local online listings I found this TC and would love any advice/tips/tricks to properly test the car and ensure it is working properly as well as to get the forum's opinions/thoughts (I don't have a lot of $ but am really excited to start my first project). I messaged the current owner and was asking the general questions about it and to quote him...
             
Quote
"The car drives fine and handles pretty well. Transmission works great. Valve cover gasket is leaking some but I just keep a check on the oil and add to it when needed. Only glitch I've ever noticed was on a long drive the car shut its self off but I pushed the clutch and turned the key and it started straight back up. I'm not a mechanic so I have no idea why it done that and only done it on the long trip. I daily drive it in town and never have had a problem.  Turbo spools up fine, boosts 18lbs and has safety shut off switches in case you over boost the turbo which is pretty much impossible. I can't tell much on the car it's the first 4 cylinder I've ever owned and if it wasn't turbo'd I would have never got it. But for what I use it for which is to just get around town or what not it does great and is really comfortable"[/I]

 As with any used car, I assumed it's always a good idea to get the VIN, get a carfax, see the car, drive the car, etc but rather unsure of anything else. Any help would be greatly appreciated! Thank you all so much for the wealth of knowledge on this forum!
3
Drivetrain Tech / Trying to figure speedometer issue out
Quote from: Aerocoupe;435971
There should be a tag on the AOD that will identify what it is but if that is missing then it becomes a bit more of a pain.  This is a good write up on the history of the AOD:

http://www.lincolnsonline.com/tech/00080.html

This guy is an AOD genius:

http://www.silverfoxtrans.com/silverfoxtrans.com/Home.html

Another good speedo gear calculator:

http://www.tciauto.com/tc/speedometer-gear-calculator/

You need to reduce the number of the teeth on the driven gear (the plastic gear on the speed sensor - http://www.latemodelrestoration.com/item/LRS-9731B/83-93-Mustang-Speed-Sensor) by about two teeth to get it to speed up 10 mph.  General rule of thumb is one tooth on the driven gear is equal to about 5 mph.

My guess is that the original trans that was in your car had an 8 tooth drive gear and the trans you have now has a 7 tooth drive gear.  The drive gear on the AOD's is cut into the output shaft and the only way to change them is to replace the output shaft.  The T-5 have a plastic drive gear that slides on the output shaft and is clipped into place.  A much nicer setup as you can just pull the tail housing and change the plastic gear on the T-5's.

Anyhow, good luck with the correction.

Darren

Thanks everyone for the responses! Aerocoupe, would it be best if I just left things as they lie and deal with the speedometer issue for the time being or could it cause further issues since it could be difficult to switch out the gears?
4
Drivetrain Tech / Trying to figure speedometer issue out
Hello to all! This is my first post so please forgive me if I sound like a complete idiot. For the past couple weeks I have been trying to read on the board on the many issues my T-Bird has been having and trying to slowly knock each problem out. First things first. I acquired my 87' T-Bird 5.0L AOD a couple years ago knowing absolutely nothing about them (just needed something that ran to get to college). Now that I have graduated and became quite fond of this car, I would like to get it running as well as I can for (more or less) a daily driver.

First question: My speedometer is about 9-10 mph slow. (Ex. when I get on the interstate I set the cruise at 60-61mph to keep up w/ traffic going 70mph)  From what I read on the forum this can be from changes in the rear end, transmissions,differences in speedo gears, etc.  The info that I have is that the tranny was changed at one time w/ an AOD from a mustang (dunno the year). The rear axle is still stock as far as I know (2.73).What should I do next? Any help on this would be so appreciated! Also, is there any differences in the AOD transmissions from T-Bird to Mustang and if so, is there anything I should do/alter/modify to make it last?  Thanks again everyone and so glad I found this forum!!!



Smirdok - 1987 T-Bird 5.0L w/ AOD (stock as far as I know except transmission)