3.55 Rear end gears, awaiting purchase - Forums at Modded Mustangs
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post #1 of 22 Old November 9th, 2011, 05:13 PM Thread Starter
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3.55 Rear end gears, awaiting purchase

I have stumbled upon 3.55 gears from a 2001 cobra. Will the go in my 94 gt?

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post #2 of 22 Old November 9th, 2011, 05:25 PM
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Yup.

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post #3 of 22 Old November 9th, 2011, 05:31 PM Thread Starter
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Talked him down to $40. Brand new. Score.

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post #4 of 22 Old November 9th, 2011, 05:41 PM
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Originally Posted by Sinatra View Post
Talked him down to $40. Brand new. Score.
That's an awesome price. I have 3:55 brand new still in the box that I bought 10 years ago a still haven't put them in. Lol

I'm thinking about selling them. But there's no way in hell I'd let them go for 40 bucks. I'm thinking about going with 3:73 now. Not sure yet what I'm going to do


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Last edited by ryanw; November 9th, 2011 at 09:01 PM.
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post #5 of 22 Old November 9th, 2011, 08:47 PM Thread Starter
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That's an awesome price. I have 3:55 brand new still in the box that I bought 10 years ago a still haven't put them in. Lol

I'm thinking about selling them. But there's no way in he'll I'd let them go for 40 bucks. I'm thinking about going with 3:73 now. Not sure yet what I'm going to do
I wanted 3.73 but this was too good to pass up. 3.55 should be totally sufficient. Have been keeping my eyes pealed to craigslist since I got the car.

I just remembered that I changed the rear gasket, all new fluids when I got it. What a waste that was lol

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post #6 of 22 Old November 10th, 2011, 10:48 AM
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Originally Posted by ryanw View Post
That's an awesome price. I have 3:55 brand new still in the box that I bought 10 years ago a still haven't put them in. Lol

I'm thinking about selling them. But there's no way in hell I'd let them go for 40 bucks. I'm thinking about going with 3:73 now. Not sure yet what I'm going to do
Yeah, the set of 3.73s I just got in had been sitting in my garage for about 7 years, hahaha.

If you've already got 3.27s (per your sig), I don't think the jump to 3.55s would be worth it from a seat-of-the-pants perspective. Now, if you've done the math for the quarter, and know that 3.73s would add a shift, 3.55s would be a better choice, but that's about the only situation in which I think you're better off with the higher gears.

Basically 3.55s are only getting you a 8.5% increase, where 3.73s get you 14%.

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post #7 of 22 Old November 10th, 2011, 11:54 AM
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Are you installing them yourself? If not...

3.55 gears, $40. Install, $300-400 depending on your area, total cost. $440
New 3.73 gear, $180, $300-400 depending on your area, total cost. $580, only $140 more.

You already have a 3.27, 3.55 is not a big jump at all, 200 rpm cruising, 300 at shift point. If you are tweaking your track end rpm and tire swaps can't make up the difference and the 3.55 gets you where you want to be then go for it, other than that, a waste.

Buy the good deal on the 3.55's, assume they are in good shape, resell them for the average going rate on Corral and then buy some 3.73 or 4.10's.


Last edited by nolife; November 10th, 2011 at 12:00 PM.
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post #8 of 22 Old November 10th, 2011, 04:20 PM Thread Starter
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Are you installing them yourself? If not...

3.55 gears, $40. Install, $300-400 depending on your area, total cost. $440
New 3.73 gear, $180, $300-400 depending on your area, total cost. $580, only $140 more.

You already have a 3.27, 3.55 is not a big jump at all, 200 rpm cruising, 300 at shift point. If you are tweaking your track end rpm and tire swaps can't make up the difference and the 3.55 gets you where you want to be then go for it, other than that, a waste.

Buy the good deal on the 3.55's, assume they are in good shape, resell them for the average going rate on Corral and then buy some 3.73 or 4.10's.
Installing myself . I'm going from stock to 3.55s...should be a nice difference.

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post #9 of 22 Old November 10th, 2011, 04:29 PM
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Originally Posted by ReverendDexter View Post
Now, if you've done the math for the quarter, and know that 3.73s would add a shift, 3.55s would be a better choice, but that's about the only situation in which I think you're better off with the higher gears.

Basically 3.55s are only getting you a 8.5% increase, where 3.73s get you 14%.
You've got to look at that in a different perspective. Acceleration is what gets you through the 1/4 faster and 3.73's will accelerate the car faster than 3.55's will. Just because you will have to add a shift doesn't mean that you'll go slower, quite the opposite. Ideally, you want to be at the top of 4th gear in a 5 speed car when you cross the traps. Depending on engine, trans, and tire size that may or may not make 3.73's a better choice, but usually lower power cars benefit from more gear in the 1/4 and get you closer to the top of 4th at the traps.
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post #10 of 22 Old November 10th, 2011, 04:30 PM
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Installing myself . I'm going from stock to 3.55s...should be a nice difference.
What is your stock ratio? If it's 3.27, you're going to be disappointed like nolife suggested.
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post #11 of 22 Old November 10th, 2011, 05:59 PM
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I think every one is getting me and Sinatra confused. I'm not sure what his stock gear is. But I'm the one that has the 3:27 in my car now. And I also have 3:55 new still in the box. I was thinking of getting rid of the 3:55 and getting some 3:73. Would I be better off throughing in the 3:55, or would I be better off getting the 3:73.


I have a 5 speed, and I'm will end up supercharging it wary next year. The car will not see that much track time. Knowing all this, what do you think


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3:27 gears

Last edited by ryanw; November 10th, 2011 at 07:45 PM.
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post #12 of 22 Old November 11th, 2011, 11:27 AM Thread Starter
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What is your stock ratio? If it's 3.27, you're going to be disappointed like nolife suggested.
I'm pretty sure stock 5.0gt are 2.73 gears.

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post #13 of 22 Old November 11th, 2011, 11:35 AM
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I'm pretty sure stock 5.0gt are 2.73 gears.
stock 5.0 with 5spd is 3.08

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post #14 of 22 Old November 11th, 2011, 11:51 AM
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stock 5.0 with 5spd is 3.08
Not exactly. 3.08s were a factory option, but the stock gears were 2.73s.

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post #15 of 22 Old November 11th, 2011, 12:47 PM
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perhaps 3:08's came w stick. my lx coupe is a 5 spd and came w 3:08. i swapped in a whole other rear from a 92 lx auto vert and it was a 2.73.

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old 5.0's are like a box of chocolates.......... never know what your gonna get
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post #16 of 22 Old November 11th, 2011, 01:03 PM
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i bought my car all stock and the original owner got the factory option 3.27 gears

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post #17 of 22 Old November 11th, 2011, 01:11 PM
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At least with foxbodies, 3.27s were a factory option, but only behind automatics. Guess that changed with SN95s.

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post #18 of 22 Old November 11th, 2011, 02:44 PM
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or it could be a gt vs lx thing.

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old 5.0's are like a box of chocolates.......... never know what your gonna get
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post #19 of 22 Old November 11th, 2011, 03:15 PM
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or it could be a gt vs lx thing.
Huh? No. For foxbodies (at least aero cars), 2.73s were stock, 3.08s were a factory option, and 3.27s were a factory option behind automatics. GT vs LX had nothing to do with it.

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post #20 of 22 Old November 11th, 2011, 06:37 PM
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That's an awesome price. I have 3:55 brand new still in the box that I bought 10 years ago a still haven't put them in. Lol

I'm thinking about selling them. But there's no way in hell I'd let them go for 40 bucks. I'm thinking about going with 3:73 now. Not sure yet what I'm going to do
swap me out your 327 rear for my 373 rear, bam! done

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