aod trans problems

[4cfed]

ok bair with me im going to try and post ever bit of info i can on my problem and explan it the best i can...last night and today it seems that the trans is slipping but shifting extremely hard hard enough that my 191k mile aod would melt slicks hitting second gear(no stall converter no shift kit nothing all stock) like i said it seems that its slipping but not when it shift car goes like hell for about 1/2-1 second after shifting still shifting extremely hard.
Last rsd i ran 15.1 @92 mph just shifting to 3rd about 50-70 feet from the trap....this rsd no other mods done except for the gears and clutch packs in rear rebuilt ran 14.7 @ 92 mph crossing line at 5k rpms in 3rd....something is definatly wrong here same mph but 4 tenths faster

NEXT what do i need to convert to a c4?? or is it bolt in and go?? i can get a good c4 for cheap will i have enough gear with the c4 and 4.10s if i actualy make some good hp??

[Wicked]

as far as AOD's go, well I can offer my opinion. THEY SUCK BALLS. Well at least in stock form.

Going to a C4 is an awesome thing to do. The trans itself weighs alot lighter and is MUCH more efficient. The only problems I see are:

1) you will need a custom speedo box from a speedo shop ( $200+ ) to make your speedo work.
2) with the 3rd gear ratio and 4.10's your engine RPM's at 65 MPH will be close to 2800-3000 RPM.
3) you will need an aftermarket shifter such as a B&M.



Other then that you could expect a small reduction in 1/4 mile times and maybe an increase in trap speed. Shoot em a PM, I have a few parts laying around I could donate to your project to make you a tad faster.

[4cfed]

well on the cruising speed im spinning about 2500-2600 at about 55 mph right now with the speedo reading 90 ish lol.....

thanks for the info....but like i said something has to be wrong with my trans for the e/t its runing ...i cant even hang with stock mustangs

as far as the speedo not working it realy doesnt matter to me..it wouldnt be the first thing iv ownes that he spedo dont work
do i need a diff driveshaft?? or are the c4 and oad driveshafts the same?

[Wicked]

the driveshaft should work. I used the stock driveshaft from a Lincoln Mark 7 when I went with a C4 and it worked perfectly.

[4cfed]

as long as my drive shaft works fine thats great..... nothing else needed..just bolt it in and go??? well shifter of course

[Wicked]

get the flywheel with the C4 and make sure its the 50oz balance one.

[4cfed]

so mine wont work??? and how do i tell if its the 50 oz balance one?? sorry im new to all this mustang stuff......what about starter? mine wil work right?

[Slow Ride]

if this is your only daily driver I'd rethink the 3 speed

[4cfed]

well from everything iv read and been told it should be stronger then the aod and im figuring it should be fine with 28-29 inch tall tires on it..but i will investagate more before i do it..im almost thinking it would just be easyer for sake of down time to toss a good aod in it with a small stall

[Wicked]

whatever floats your boat. A c4 with a 28" tall tire woudl be just fine. I drove 1200 freeway miles in a 10.80 mustang with 4.10's and a C4.. why would he rethink it as a daily driver?

[1SLO5.0]

The speedo will work fine with a C4 and your flex plate will work too. The starter should work just fine. Driveshaft will work. Do not go to a 28" tire. The car will slow down. Run the smallest tire you can hook. A 26x8.5 slick or 26x10.5 ET street is plenty. If you are concerned about gas mileage then you need to find an economy car. You can't have your cake and eat it too. I honestly wouldn't waste the time on swapping transmissions until you break your AOD. There are plenty of guys going fast with AODs. I don't think anything is wrong with your trans. You are out of the power range of the stock 5 liter going thru the lights which is why you are not gaining any mph. If you gained anything with a C4 it would be due to the fact that it takes less horsepower to operate than an AOD, not because your AOD is junk. Also, if you just throw a junk yard C4 in the car you won't be any further ahead than you are now. You will have about $500 in the trans assuming you rebuild it yourself and you will have another $400 or more in a torque converter and then another $130 or so in a shifter. For that money, you'd be better off buying a set of heads.


Jeepers, that was a Mustang driveshaft you used. The Lincoln driveshaft is about 6 inches longer. I think I gave you a Mustang driveshaft with that car by mistake.

[brommosauto]

stay with the aod

[Wicked]

Jeepers, that was a Mustang driveshaft you used. The Lincoln driveshaft is about 6 inches longer. I think I gave you a Mustang driveshaft with that car by mistake.

well thank you for that :hello:

4cfed, listen to Darrell, he has learned everythign the hard way and knows what works and what doesn't. Without his help over the phone on multiple occasions, I woudl not have had the results that I did with my mustang

[4cfed]

oh i know i dont doubt darrel one bit beleave me hes told me enough so far to get me where i need i took kraus (new build) for a ride tonight he said something about a solinoid for the trans might be junk ...and we think possibly my converter is on its way out....the car has alot of use and abuse on it but shes still running strong..im just tryign to figure out why its not where alot of other mustangs with the same stuff are..theres got to be someting thats not doing what it is suposto or doing it right

[1SLO5.0]

Your converter is not bad. There are no electronic shift soleniods on that trans either. It is an AOD not an AODE. Forget about the trans. If it isn't slipping chances are there is nothing wrong with it. Address the problem at hand. At 5000 rpm the motor has fallen on its face. Stock E7 castings flow like a pencil. At least put some GT40p heads on with a good valve job and a set of springs to match the cam you choose. A better bet would be to find a set used Trick Flow twisted wedge heads. You should be able to find a used set for aroun $700. They will make loads more power than GT40p heads and have room to grow as well.

And quit calling those tires slicks damn it! They are Yokohama drag radials (and very small ones at that) not slicks. Drag radials and slicks are two very different tires. That can be very misleading when you say slicks and you want someone to diagnose a problem.

[Wicked]

I can vouch for the twisted wedge heads. On the dyno alone, they can me 68 HP over a set of fully ported 54cc iron heads that they replaced. without any other changes. Of course I had a a non roller block with aftermarket pistons and a comp cam .512/.512 282 cam.

[Wicked]

Darrell, do you remeber my first Mustang? The red on with two black stripes? That was mostly stock with 3.73 gears, full flowmaster off road exhaust, extrude honed upper and lower intake and a cold air intake. The best I could EVER run with the stock AOD was 14.9's over and over again.. it was frustrating and slow. Once i got my art carr trans ( still using the stock convertor ) I ran 13.9's consistantly back to back with no other changes to the car.

Stock AOD's just blow monkey ass. Honestly, I also think a good set of aftermarket heads, a matched cam and a good tune would get you solidly into the 13's and the car woudl wake right up!

[4cfed]

i seriously wish my car was a 5 speed..i found a clean 89 lx 5.0 5 speed with exhaust and 4.10s for 2500..it makes me almost wish i would have just waited to buy something..but ether way i will work with what i have untell i get pissed off and give up on it ...this car is suposto be buget build and im having a feeling that its not going to stay under my $$ amont i set to do it with

[1SLO5.0]

Darrell, do you remeber my first Mustang? The red on with two black stripes? That was mostly stock with 3.73 gears, full flowmaster off road exhaust, extrude honed upper and lower intake and a cold air intake. The best I could EVER run with the stock AOD was 14.9's over and over again.. it was frustrating and slow. Once i got my art carr trans ( still using the stock convertor ) I ran 13.9's consistantly back to back with no other changes to the car.

Stock AOD's just blow monkey ass. Honestly, I also think a good set of aftermarket heads, a matched cam and a good tune would get you solidly into the 13's and the car woudl wake right up!


I wonder if your trans was slipping in that car from the get go. My buddy Keith went 14.90s spitting and sputtering all the way down the track with a bad mass air sensor and that car was bone stock right down to the factory tires. Bud Van Buren's car went 14.2s with 3.55 gears and exhaust on street radials with a stock AOD. That's some goofy shit.

[4cfed]

see point proven everyone elses cars are going faster then mine with less gear and more weight

[Wicked]

I wonder if your trans was slipping in that car from the get go. My buddy Keith went 14.90s spitting and sputtering all the way down the track with a bad mass air sensor and that car was bone stock right down to the factory tires. Bud Van Buren's car went 14.2s with 3.55 gears and exhaust on street radials with a stock AOD. That's some goofy shit.

That could have been the case.. who knows. I am done with Mustangs for awhile, I think the next car will be a nice Camaro or maybe a Dodge duster...

[brommosauto]

if your worried check the cable end on the throttle body theres a grommet that holds the cable common for that grommet to take a crap