3.23 posi how much lower? - TCCoA Forums
 
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post #1 of 12 (permalink) Old 03-05-2004, 09:59 AM Thread Starter
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Question 3.23 posi how much lower?

Well I have factory 3.23 posi in my 97 LX. I know you can add almosty any gears but too much and you will need a computer chip to make the corrections properly. Id like to swap to 3.73 gear set or 4.11s. I am sure 4.11s I would have to get a computer and to buy the gears for 100+ dollars and a 300$ chip at the same time I don;t think I want to do. I read somewhere i thought that 3.73 gear upgrade only requires a differnet speedo gear? Or am I wrong? i plan on racing my car and just getting more performance out of it. Gears are cheap but the other expenses might add up fast. Any words of advice? 4.11s? 3.73? 3.90s? neither?

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post #2 of 12 (permalink) Old 03-05-2004, 11:41 AM
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do they even make 3.90s or 4.11s for our 8.8 rear ends?...i thought all we could do is 3.27, 3.55, 3.73 or 4.10 for our 8.8 rear ends unless you u swap the rear axle...

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post #3 of 12 (permalink) Old 03-05-2004, 01:31 PM
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3.23 is not a Ford factory ratio niether is 4.11. The EEC can compensate for a two step in gears. This has been discussed indepth...check out the search button.

3.08 - 3.55 EEC should read right
3.27 - 3.73 EEC should read right
3.08 - 3.73 EEC needs new programming
3.27 - 4.10 EEC needs new programming.

FYI, 3.23 and 4.11 are both GM ratios.

joseph




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post #4 of 12 (permalink) Old 03-05-2004, 02:12 PM
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the tbird gear ratios out of the factory that I can think of are.

2.73 - fivespeed supercoupes
3.08 - most lx's
3.27 - lx option
3.31- supercoupe option automatic


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post #5 of 12 (permalink) Old 03-05-2004, 02:16 PM Thread Starter
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Exclamation more gears

I thought I saw 3.23 ok so my rear end ration must be 3.27 posi. I know it is posi and what ic an tell by the codes. If I got to 3.73 the ECC shoul dbe OK right? I assume 4.10s would be too much without the computer to be reprogramed. thanks
Regg

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post #6 of 12 (permalink) Old 03-05-2004, 04:29 PM
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one of the aftermarket companies makes 3.90 gears, can't remember the name for sure, but I think its Motive.
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post #7 of 12 (permalink) Old 03-05-2004, 05:22 PM
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Quote:
Originally posted by Chlorine
one of the aftermarket companies makes 3.90 gears, can't remember the name for sure, but I think its Motive.
3.90 gear ratio, and a whole lot more ...
Obtaining a speedometer gear that will keep eveyrthing accurate would be a challenge.

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post #8 of 12 (permalink) Old 03-05-2004, 09:55 PM
 
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Quote:
Originally posted by The Great Obucina
FYI, 3.23 and 4.11 are both GM ratios.
Say WHAT? The ratio isn't what makes it a Ford or GM. What makes it Ford or GM, is what type of differential it's designed to bolt on to. Having many different ratios to choose from, allows racers to fine tune their cars.

Oh, & just for the record. A "Posi" (short for Positive Traction), is a GM limited slip differential. I guarantee that nobody here has a GM differential in their Ford rear end! It's a common inaccuracy, but that doesn't make it correct.

68COUGAR

Last edited by 68COUGAR; 03-05-2004 at 10:00 PM.
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post #9 of 12 (permalink) Old 03-06-2004, 10:51 AM
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Quote:
Originally posted by 68COUGAR

Say WHAT? The ratio isn't what makes it a Ford or GM. What makes it Ford or GM, is what type of differential it's designed to bolt on to. Having many different ratios to choose from, allows racers to fine tune their cars.

Oh, & just for the record. A "Posi" (short for Positive Traction), is a GM limited slip differential. I guarantee that nobody here has a GM differential in their Ford rear end! It's a common inaccuracy, but that doesn't make it correct.

68COUGAR
niether 3.23 or 4.11 are listed as an 8.8 ratio gear offered by Ford. My friends Z28 has a 3.23 ratio from the factory and GM offers a 4.11 gear for its 8.5 diff.

joseph




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post #10 of 12 (permalink) Old 03-06-2004, 10:35 PM
 
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Quote:
Originally posted by The Great Obucina
niether 3.23 or 4.11 are listed as an 8.8 ratio gear offered by Ford.
What's your point? Are you saying that only OEM per/year spec. are the only gear ratios that "according to YOU", are Ford?

If an aftermarket vendor makes a 3:23 gear for a Ford 8.8" rear end, is that NOT for a Ford?

There are NO Ford or GM "EXCLUSIVE" gear ratios!!!!!!!

Buy a P.A.W. or JEGS catalog, & check it out for youself!!!!

68COUGAR
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post #11 of 12 (permalink) Old 03-07-2004, 09:51 AM
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Quote:
Originally posted by 68COUGAR

What's your point? Are you saying that only OEM per/year spec. are the only gear ratios that "according to YOU", are Ford?

If an aftermarket vendor makes a 3:23 gear for a Ford 8.8" rear end, is that NOT for a Ford?

There are NO Ford or GM "EXCLUSIVE" gear ratios!!!!!!!

Buy a P.A.W. or JEGS catalog, & check it out for youself!!!!

68COUGAR
or the listed available 8.8 ratios manufactured at Ford's Sterling Gear Lab offered by FRPP. I am quite aware of aftermarket manufacturer such as Motive gear who makes a 4.11 for the 8.8....BTW, F'n A....did you bother to read everything, he said he had a factory 3.23 POSI...How many posts would you like to discuss this in? His question was answered.

joseph




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post #12 of 12 (permalink) Old 03-07-2004, 04:26 PM
 
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I thought all EEC's for the Thunderbird LX automatics were programmed for 3.08 gears and they did compensate for two gear steps up. Wouldn't the 2nd gear step up really be 3.55's then? If you had factory 3.27's then wouldn't you already have used up one of your steps up? i also remember reading that if you had done the J-mod it would also help the transmission to shift "more correctly" if you do a gear change.
Correct me if i'm wrong, but i seem to remember reading this?

3.08
3.27
3.55?
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