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Discussion Starter #1
I am getting a 03 mach1 tranny next week somtime and was wondering what the difference is that makes them stronger then my stock tranny or even a GT tranny...

PS I am wondering what the best TC to go with would be?? somthing around 3000 stall?
 

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The 03+ trannies have the same upgraded parts that the 5.4L trannies get. The gearsets are much stronger, among other things.

The TC you choose depends on the engine it's behind. A 3000 stall on a near stock engine won't be the best choice. A maurauder/mach1 TC would be a good choice for that IMO.
 

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my 03 trans came out of a stang also. It does NOT have a VSS, or the gears on the output shaft to turn it. Other than that it's just ducky.













GO BIG OR GO HOME!!!
 

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I know for a fact that the 2003 converters are better than any previous year. They became furnace brazed, bearing on thrust surface, and they have the larger sprag assembly.
Alan
 

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It will be quickest with about 4k stall. As said already it likely does not have teeth to drive the VSS. To replace the output shaft will require a full teardown, it's the last part to come out of the case. Might as well get a 7 tooth shaft to avoid the speedcal if you are keeping the gears you have. If you are going to a more manly gear, you'll need the speedcal anyway, so either 7 or 8 toth will be fine.
 

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DMcBrideBoston said:


Kris, What determines how much of a stall you should have; Is there a table or articles I could find somewhere to help myself and others choose the correct stall?

Thanks

Dave
My old rule of thumb is stupid simple. The typical engine makes good power in about a 2000 rpm range. Based on what he has for an engine, we know it runs out of steam at about 6000. So about 4000 would be optimal. This has always worked for me in any type of vehicle I have ever owned.
 

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Discussion Starter #8
so i have to tear this tranny down completely to change the teeth?
 

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KrAzyT said:
so i have to tear this tranny down completely to change the teeth?
Yes all the way to a bare case really.
 

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Unless somebody has come up with a way to utilize the OSS to get the signal for the speedo, you'll have to swap shafts. In my situation, I said screw it until further notice.:D




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So, if you find a '03 tranny out of a Mustang, with the "same" internal goodies as a 5.4, you have to pretty much tear it down to replace the shaft. In that case, would it almost be better to find a 5.4 tranny, and just install it?

if I had to tear a '03 tranny down to the bare case just to have a speedo, I would either say screw it, or tear down my old one, and replace all the "not up to 5.4 spec" parts...probably cost the same in the long run, no?

I say go drive the car now...find out what RPM you are at when traveling the speed limit(test 65mph, 45 mph, and 35 mph-make mental note of them), and then just install it with no VSS. When you want to go one of the popular 3 speed limits, just plant the tach at the proper rpm.

My 98 Mustang tranny uses a different speedo gear than my 94 mark VIII had. I havent figured out yet which gear to install, so for now I use my tach as my speedo!
:D

p.s. I have a Mach 1 TC:D

while on the subject, since a stock 98 Mustang GT with a A/T came with 3.27 gears, and my mark VIII came with 3.08's, if I installed 3.27's, would my speedo instantly correct itself? I ask because I have no concept on how the electronic speedo's work. I am used to cables, gears, and noisy speedo's on ice-cold mornings!(old school).
I am not about to go through the effort of buying 3.27 gears just to get my speedo right. If i was gonna do a gear swap, I would 3.73 or 4.10 the car. But I am curious.

Ok, you can have your thread back;)
 

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Discussion Starter #12
so the GT tranny would be a direct swap so to say? i can get one with around 5k on it for 375
 

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will a speedcal take care of the VSS problem. Also I do have the 3.73 gears I know with a 8 tooth shaft i will need a speedcal (if I use a 99+ GT tranny). Also what is the OSS?
 

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Ashish said:
will a speedcal take care of the VSS problem. Also I do have the 3.73 gears I know with a 8 tooth shaft i will need a speedcal (if I use a 99+ GT tranny). Also what is the OSS?
Speedcal is fine as long as the output shaft actually has a gear on it, many of the new ones don't.
 

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Im sure someone will eventually make a mod to use the OSS signal to drive an older VSS signal..

Note: the OSS is a Square wave, as the VSS is a Sine Wave.
 

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it's easy to spend over $1,000 on new parts when you're doing a quality "rebuild" on one of our trannies.

also to pull apart an 03' tranny and swap in an output shaft with vss teeth, all you need for tools is a front pump puller, socket set, and snap ring pliers. to fully "rebuild" one, you need some other specialty tools.

Blackicelsc said:
if I had to tear a '03 tranny down to the bare case just to have a speedo, I would either say screw it, or tear down my old one, and replace all the "not up to 5.4 spec" parts...probably cost the same in the long run, no?
 

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I cant see any reason you cannot use the OSS for the Speedo singnal at all,, a Speed-cal might be needed to match the singnal to the speedo. Like it was said above the ford EEC just looks for a HIGH/LOW condition to calculate speed so whether or not its a Square or Sign wave should not matter. BTW where did the info come from that its different? I would believe both the VSS and OSS were of the same type of output device.

I've never opened up a new 4R70W,, Does the OSS ride on the output shaft threw a gear like the VSS did? for 96/97 guys might be able to change out there OSS gear to match the orig unit (if they were in fact different ones avail)

Brad M
 

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When you pull out the OSS, you can see that it's a magnetic pick-up type sensor. That means there's a probably some sort of "toothed" trigger on whatever it takes it signal from. Kinda like the crankshaft position, or cam position sensors.
Or it's a hall-effect type trigger. But there are no gears on the OSS to drive it.






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