Progress Thread My first fox. 88 vert

nashville

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Jan 4, 2019
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Hi!

I bought this for my self for a wedding present. Searched ALL over for a coupe (of course) and even a hatch and couldn’t find one at all. This convertible caught my eye and I pulled the trigger. I feel like I over-paid, but whatever. I’m happy.

I ran the vin and it said it was and AOD car. But now it’s a 5 speed so the previous owner swapped it.

What does that mean for my rear end? Is it a 2.73? 8.8? Any help would be appreciated.

It needs paint. Bad.

The photos are attached in order of how I got it and to how it sits today.
 

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BlakeusMaximus

Still got to try a little lube on my speedo head
Jul 12, 2017
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Nice car man. I love the color and the wheels. 17 inch ponies right? I had a vert the same color, that was also my first mustang. My vert was also an 88. Bought it in 99. Looks good!
 
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Mstng93SSP

You have a nice rear end there Dave.
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Nice looking car. The 2:73 is the gear ratio of the rear end gears. 2:73 came stock in an AOD car usually. People usually swap gears to a higher ratio for better acceleration. 3:73s are a common swap. All v8 cars came with the 8.8 rear end.
 
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Mustang5L5

i'm familiar with penetration
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Feb 18, 2001
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AOD cars could have had 3.27s. Rare, but it was an option.


I have 3.73s in my fox and if I could do it again, I'd do 3.55s
 
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90sickfox

I didn't really have an issue with the stink...
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The easiest way to tell what is in the rear is to put it on a lift ( in neutral ) and spin the wheels by hand. Mark the driveshaft and one of the wheels and count. Three and a half turns to spin driveshaft one complete turn is 3.55....three times 3.08...less than three 2.73...three and 3/4 turns 3.73....four turns 4.10.

You may already have 3.73 gears. Also, if both wheels spin same direction when turned by hand then it's good posi rear. If only one spins ( or other wheel turns opposite direction ) it's an open rear or the clutches in the rear need to be rebuilt.
 
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BlakeusMaximus

Still got to try a little lube on my speedo head
Jul 12, 2017
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I just might get the 17 inch pony’s. The more I see them, the more I like em.
 

John Dirks Jr

there is enough sticking out to grab on to
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Since you get to pick the new gear ratio, I recommend 3.55. If you ever mod the engine to put out decent power, 3.55 is plenty of gear.

With my 400 hp at the wheels, I think 3.73 that I have is too much.
 
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John Dirks Jr

there is enough sticking out to grab on to
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Id say 300hp or under go with 3.73. Over 300, I recommend 3.55.

With my 92, I get great action all through 3rd and 4th and no traction problems. Forget 1st and 2nd I have to nurse or else its wheel spin. So I think my overall setup would be more usable with 3.55. I would be able to give more throttle without traction problems with 3.55. Maybe I'll change out the 3.73's someday
 
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hrspwrjunkie

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Dec 15, 2004
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As far as gearing goes, it's a design/engineering choice.

What are your intentions?

The factory 5.0 is geared to run the quarter mile perfectly at the top of third gear with a 5-speed and 3.08:1 gears.

If you want to optimize for a quarter mile run in either 3rd or 4th, you'll need to know the specific weight of the car as it will run down the track with driver and gas, dyno the engine on a chassis dyno to get both the output and the power band, then calculate the proper gear ratio and test to be sure you are correct and change gears if necessary.

If you are trying to run on a road course, it'll depend on the length of the longest straight and how fast it can go on it.

If you're running on the street and don't care about any of the above, I would gear for the most comfortable first gear driving. So, consider wrap up (that is, how quickly you want to shift from first to second) and how easily the car accelerates in first (that is how hard it pulls vs ease of tire spin). Then I would consider factors such as ease of driving while in gear (total acceleration response to throttle input) and how readily the car stays in the meat of the power band when driving and shifting. Finally, I would consider gas mileage. No single factor is necessarily more important than another. That's a personal call.

Those are just some over generalized considerations I make when choosing gearing.

As a concrete example, I can say that when I ran my first '87 Mustang (which was powered by a 347 stroker) in its first configuration, it LOVED 3.08s on the street. In its final configuration, I had it running 3.55s and it HATED them and it wasn't the right gear on the drag strip, either. I never tested it on any road courses, but it had too much bottom end for a stock T-5 with the 3.35:1 first and 3.55:1 gears out back. It both wrapped up too quickly in first for the street and made a mess of the 275s if I so much as held my tongue wrong while launching. It didn't really like any gear either with the 3.55s — it simply put it too high in the power band under full acceleration. When I sold it to my cousin, he put a GT-40 powered 5.0 in it and we carefully worked out the gearing choice and went with 3.27s outback and it drove great — especially with a change to a Tremec and its different gearing.
 
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JimZim

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AOD cars could have had 3.27s. Rare, but it was an option.


I have 3.73s in my fox and if I could do it again, I'd do 3.55s
I like the 3.55's with stock height rubber becase the engine is just shy of my power peak a few hundred r.p.m. in 4th going through the traps on a good run at trap speeds around 105 to 106.
 

nashville

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this is going to sound very strange or maybe even a little ricey, but i want to be able to roll in first gear - hammer the gas, and have the tires break loose. im not doing any racing, just want a fun car.
 
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