A simple matter of clarification. - TCCoA Forums
 
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post #1 of 7 (permalink) Old 01-08-2012, 01:24 AM Thread Starter
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A simple matter of clarification.

Hello, gang.

I am looking at a 1997 4.6 (non-sport) that I might possibly buy shortly (I need to get another daily driver....I'm trying to get my wife's Honda torn apart to repair it, but can't get the free time to do so....).

Here's the issue: I obviously cannot leave anything bone-stock.

I have a fresh 3.73 TL (8-clutch modded with a F150 4x4 spring) pumpkin here that I'd like to toss into the car, or even go with a set of 4.10's....however, I'm already seeing some issues with doing this. Yes, I know this has been rehashed quite a few times....however, if I'm going to spend money on something like this, I'd like to have as much information as possible before I plunk down cash for something.

1. Is a replacement driveshaft needed? I'd rather know ahead of time, and if anyone has an approximate cost....I'm not in a hurry to replicate the most recent round of 2011-up V6 Mustang driveshaft explosions....

2. To correct the speedo input....http://www.dallasmustang.com/product.php?productid=7626 (and an instruction sheet: http://www.dallasmustang.com/pages.php?pageid=37)....is this what I'm needing?

3. I've seen some mentions about a 'rear lube mod'....could someone elaborate as to what that specifically entails?

4. Would it be a good idea to get a tuner from someone if I'm going to do all of this? (this will lead to another question in the 4.6 forum room later on, of course)

Sorry to be annoying, I'd just like to make it a one-stop shopping trip....and I didn't want to annoy Allan again.

Thank you all for any advice you might have.
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post #2 of 7 (permalink) Old 01-08-2012, 01:51 AM
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1. it's not needed, but you will want to change the driveshaft. the stock one vibrates pretty good in the higher speeds. one piece mark 8 units go for about 100 bucks, and the dynotech 3 1/2 inch shaft is closer to 400 bucks
2. to correct the speedometer you can just get the speedo gear you need. i'm pretty sure you will need the purple one
3. info on cooling or forced lube mod, http://www.tccoa.com/articles/tranny...n/page12.shtml
4. yes

the most recent post on this topic here http://forums.tccoa.com/showthread.php?t=138012

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post #3 of 7 (permalink) Old 01-08-2012, 01:53 PM Thread Starter
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Quote:
Originally Posted by modularbird View Post
1. it's not needed, but you will want to change the driveshaft. the stock one vibrates pretty good in the higher speeds. one piece mark 8 units go for about 100 bucks, and the dynotech 3 1/2 inch shaft is closer to 400 bucks
2. to correct the speedometer you can just get the speedo gear you need. i'm pretty sure you will need the purple one
3. info on cooling or forced lube mod, http://www.tccoa.com/articles/tranny...n/page12.shtml
4. yes

the most recent post on this topic here http://forums.tccoa.com/showthread.php?t=138012
Is the MK8 unit aluminum?

I haven't seen anywhere else in here where there is a dependable route for a speedo gear if I use 4.10 gears....?
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post #4 of 7 (permalink) Old 01-08-2012, 02:12 PM
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Quote:
Originally Posted by EvilMooseofDoom View Post
Is the MK8 unit aluminum?

I haven't seen anywhere else in here where there is a dependable route for a speedo gear if I use 4.10 gears....?
There isn't, unless you DO use a speedcal.

Me? I've got on my list of ThingsToDo to see what it would take to pick off the ABS tone rings and use those for speedo. Need to count the number of teeth and figure out how many revs the half shafts make for 1 mile on "standard" (215/70/15 or 225/60/16) tires.

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post #5 of 7 (permalink) Old 01-08-2012, 03:15 PM
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Quote:
Originally Posted by EvilMooseofDoom View Post
Is the MK8 unit aluminum?

I haven't seen anywhere else in here where there is a dependable route for a speedo gear if I use 4.10 gears....?
Yes, the Mk 8 shaft is aluminum.

The most dependable route to have correct speedo readings with 4.10's and up is to use the stock speedometer gear and a Speed Cal or similar device that alters the signal from the vehicle speed sensor. Using a speedometer gear for 4.10 + gears will only last a few months, at best because the gear will wear out by then. Fortunately, using 3.73 gears does not have this problem.

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.
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post #6 of 7 (permalink) Old 01-08-2012, 03:27 PM Thread Starter
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Originally Posted by Mgino96tbird46 View Post
Yes, the Mk 8 shaft is aluminum.

The most dependable route to have correct speedo readings with 4.10's and up is to use the stock speedometer gear and a Speed Cal or similar device that alters the signal from the vehicle speed sensor. Using a speedometer gear for 4.10 + gears will only last a few months, at best because the gear will wear out by then. Fortunately, using 3.73 gears does not have this problem.
Is there that big of an advantage to using 4.10's over 3.73's? I already have a fresh 3.73TL pumpkin ready to go....
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post #7 of 7 (permalink) Old 01-08-2012, 04:00 PM
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Slightly more acceleration. It all depends on what you intend to use this mn12 for. I decided to use 3.73's because I do quite a bit of highway driving and this is my daily driver. As it is, the engine is spinning at 2500 RPM to do roughly 70 mph, if I recall correctly. If you plan to use this car the same way I use mine, I recommend you go with the 3.73 TL pumpkin. Especially if you already have it, and it's ready to go.

Also, don't be surprised if you use a Mark 8 drive shaft, you still have vibrations. They are better than stock, but not by much. I plan to replace mine when I can afford to.

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.
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