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post #1 of 47 (permalink) Old 02-25-2013, 09:19 PM Thread Starter
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Need recomendations

I'm thinking about 3.73s. I think 4.10s may be a bit much. This is a 97 Thunderbird, street driven mostly. Daily driven in the city and some highway/interstate driving. I just want a little more low end grunt. From my research it seem that 3.73s are the most promising. Just wanted to here from those who have them on a daily driver.

On a side note. I was also curious if anyone had any recommendations for a stall size if any for street vehicle. But if necessary I could start another thread for that in the proper section. I just didn't want to be the annoying newb thread whore.
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post #2 of 47 (permalink) Old 02-25-2013, 09:47 PM
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3.73s are great I just installed them in my bird a couple months ago. Breaks the tires very easy now, doesn't struggle as much to get the heavy a$$ boat moving. You won't regret them!! I really want some 4.10s but unfortunately I do too much highway driving right now :/. (over the summer 1 hr to work, 1.5 hrs from work - all highway driving) BUT I still don't regret doing it!!

Stall depends; a lot of guys like the upgraded mark viii converter that stalls around 2800 rpm. Personally I am thinking about going with a real converter, prob 3500 rpm. But the mark viii converter will be the best bang for the buck as the real converters are NOT cheap.

Where in TN are ya?

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post #3 of 47 (permalink) Old 02-25-2013, 09:55 PM Thread Starter
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Awesome. Next question. I'm looking into an LSD set up. I don't like the lockers. Or rather, wheel hop. Any brands better than others? I've only had experience with auburn gears.

And as far as the stall goes. 3500 seems a little high if there is any potential to run into stop and go traffic.
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post #4 of 47 (permalink) Old 02-25-2013, 10:28 PM
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For a frequently street driven car I would suggest 3.73s the 2800 stall and a jmod. Those 3 alone will make your much more fun without even touching the motor. A tune isn't an absolute necessity, but it will run 10x better with one.

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post #5 of 47 (permalink) Old 02-26-2013, 06:26 AM Thread Starter
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Originally Posted by modularbird View Post
For a frequently street driven car I would suggest 3.73s the 2800 stall and a jmod. Those 3 alone will make your much more fun without even touching the motor. A tune isn't an absolute necessity, but it will run 10x better with one.
That's pretty much exactly where I was going. I need to learn to tune myself or fins someone close. One last thing. Is the stall spline count and rear end spline count 28 spline? And where is a good place to buy? I usually stick with the classic jegs or summit.

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post #6 of 47 (permalink) Old 02-27-2013, 08:22 PM Thread Starter
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Originally Posted by Tbird1997 View Post
3.73s are great I just installed them in my bird a couple months ago. Breaks the tires very easy now, doesn't struggle as much to get the heavy a$$ boat moving. You won't regret them!! I really want some 4.10s but unfortunately I do too much highway driving right now :/. (over the summer 1 hr to work, 1.5 hrs from work - all highway driving) BUT I still don't regret doing it!!

Stall depends; a lot of guys like the upgraded mark viii converter that stalls around 2800 rpm. Personally I am thinking about going with a real converter, prob 3500 rpm. But the mark viii converter will be the best bang for the buck as the real converters are NOT cheap.

Where in TN are ya?
Sorry, I missed that last question. I'm in the Knoxville area in the eastern part of TN.
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post #7 of 47 (permalink) Old 02-27-2013, 08:27 PM
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Sorry, I missed that last question. I'm in the Knoxville area in the eastern part of TN.
Not to butt in but I miss TN!! VA sucks!

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post #8 of 47 (permalink) Old 02-27-2013, 09:10 PM Thread Starter
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Not to butt in but I miss TN!! VA sucks!
Well then come back. I would not want to leave TN either but I do have this weird drawing to NC.
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post #9 of 47 (permalink) Old 02-28-2013, 12:17 AM
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You might want to research torque converters a little more before you decide. Almost everyone that gets the mark 8 (26-2800 stall) TC ends up getting a 35-3800 stall eventually. There's a really good thread somewhere that talks about it, I think the tread is called 'how much stall' or something similar. But I mean to each there own for some people high stall bugs the crap out of them others not as much.

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post #10 of 47 (permalink) Old 02-28-2013, 06:52 AM
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Well then come back. I would not want to leave TN either but I do have this weird drawing to NC.
Well if the Navy would give me orders to Nashville I would gladly accept them

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post #11 of 47 (permalink) Old 02-28-2013, 09:49 AM
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The rear end spline count is 28, correct.

As far as stall... 2600-2800 with 3.73s is a good combo for a street/highway driven car. 3500 stall is a little high for street use IMO unless you find a good tuner who will lock the converter after shifting into 2nd. Perhaps after I finish tuning my engine and the weather clears I can make a short video of how the car behaves with 3500 stall and 3.73s locking after the 1-2.

Look up Precision Industries or Circle D for your converter if you want an aftermarket unit rather than a Marauder or Mark VIII/Mustang GT converter (I cannot recommend DirtyDog's services, unfortunately). Also be aware that you need the small bolt pattern flex plate to use most (if not all) of those converters.

-Brandon
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post #12 of 47 (permalink) Old 02-28-2013, 10:12 AM
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Another place to look at for torque converters would be Dirty Dog Performance. Alan is here on the forums from time to time.

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post #13 of 47 (permalink) Old 02-28-2013, 10:14 AM
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I'm thinking of going with 4.10s and only drive in the city, so it sounds like a modded M8/Marauder converter would be what I should get, eh?

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post #14 of 47 (permalink) Old 02-28-2013, 11:33 AM
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The 11.25" unit will give more punch but still retain good driveability without having to make drastic changes elsewhere (in the tune). Anything higher than 2800 and you start really noticing how loose the converter is.

-Brandon
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post #15 of 47 (permalink) Old 03-01-2013, 06:20 AM Thread Starter
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I think the video would be great. I would love to see how it responds. I see a lot of stop and go traffic on my way home from work. I understand that the car will move under 3500 rpms. But I have very little experience with aftermarket converters.
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post #16 of 47 (permalink) Old 03-01-2013, 11:02 AM
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http://m.youtube.com/#/watch?v=AWiZM...%3DAWiZMCeDWZg

Skip to about 2 mins in or it will make you sick. He has a 4200 stall which is probably a little much for you but you get the idea.

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post #17 of 47 (permalink) Old 03-01-2013, 10:42 PM Thread Starter
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Not bad. I like this video as well. From the way it looks you could probably do casual and city driving with pretty much any stall.
http://www.youtube.com/watch?client=...ted&nomobile=1
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post #18 of 47 (permalink) Old 03-18-2013, 10:37 AM
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With the DOHC I know people say 4.10's are the way to go. What about with a daily driver seeing about an hour total of highway driving a day? Should I step down to 3.90's or even 3.73's? Lookin to buy gears right now but dont know what to go with. It's got an 03 GT converter in it which is i think a 2300 stall? Also what speedo gear would I need with an 02 Gran Marquis trans having the different toothed tailshaft gear? Thanks guys.

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post #19 of 47 (permalink) Old 03-18-2013, 08:20 PM
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You wont be disappointed with 3.73s. But I think you will like the 4.10s better

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post #20 of 47 (permalink) Old 03-18-2013, 08:32 PM
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How big are your tires?

With an 8 tooth output shaft you need a speedcal if you run anything shorter than a 3.55 and a 27" tire. With that combo you'd need a 21 tooth gear. Anything with more teeth is known to break and send chunks of plastic through the tranny.

With a 4.10 and a 26.5" tire, you'd theoretically need a 25 tooth gear, which doesn't exist.

If you'd rather avoid the speedcal, you can swap an MN12 or FN10 4R70W 7 tooth output shaft onto the 2002 transmission. Then with a 27" tire and 4.10 you will be right where you need to be with a 21 tooth speedo gear.

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post #21 of 47 (permalink) Old 03-18-2013, 08:50 PM
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275/40/17 in the rear. I think it comes up to 25.7 inches tall. So there IS a way to avoid a speedcal?

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post #22 of 47 (permalink) Old 03-18-2013, 11:53 PM
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i ran 4.10's through college with 275/60r15 rear tires. 21mpg on the highway. just make sure you have a good driveshaft and lube mod for the transmission.
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post #23 of 47 (permalink) Old 03-19-2013, 06:21 AM
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With such a short tire, the most gear you can run before you need a speedcal IF you swap to the 7 tooth output shaft is a 3.90. That would be with a 21 tooth gear.

-Brandon
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post #24 of 47 (permalink) Old 03-19-2013, 10:18 AM
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I'd say 3.73 is a good choice, especially if you do any decent amount of highway cruising.

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post #25 of 47 (permalink) Old 03-19-2013, 08:09 PM
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That 7 tooth output gear and 3.90's sounds like a plan then. Thanks Term.

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post #26 of 47 (permalink) Old 03-20-2013, 08:32 PM Thread Starter
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So wait....With stock tires and 3.73 you'll need a speedcal? Or am I reading this wrong. I was under the impression that 3.73's was the highest you could go with out a speed cal on stock wheels/tires. Correct me if I'm wrong.
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post #27 of 47 (permalink) Old 03-20-2013, 08:38 PM
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You need to switch the speedo gear if you have a 7 spline output shaft. Newer transmissions have an 8 spline which requires a speedo gear that ford doesn't make and isn't very durable. I know when I upgrade mine to 3.73 and an 02 trans I will need a speed cal.

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post #28 of 47 (permalink) Old 03-20-2013, 08:53 PM Thread Starter
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I have a 97. So do I have a 7 or 8? Because when you say newer I know you may not be talking about thunderbird trannys in particular. So, long story short, I have to change my speedo gear?
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post #29 of 47 (permalink) Old 03-20-2013, 09:47 PM
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MN12 and FN10s with a 4R70W got a 7 tooth output shaft. All other 4R70Ws have 8.

It's much easier to swap the output shaft of the stock transmission onto the newer transmission than it is to buy and install a speedcal. That's how my 2004 trans is set up.

What size tire are you running? With stock sized tires (26.5" height), a 7 tooth output shaft and a 3.73 rear end you'd need a 20 tooth speedo gear.

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post #30 of 47 (permalink) Old 03-21-2013, 06:16 AM Thread Starter
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Yes I'll be on stock tire/wheel set up with 3.73s. So where so do you buy these speedo gears at?

P.S. also stock transmission
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