Basic Info on 7.5 Ford (Rear end in v6 mustangs) Stock Gear Ratio: 2.73, 3.27 Splines: 28 Oval cover 10 Holes Open Carrier
Ok everyone suggest gears as a mod, of course its a great one to suggest. By gears people mean the rear end gears. A Lower gear ratio will really help your acceleration, but hurt your top speed. Stock for the 7.5 Ford in the mustangs is 2.73(94-98) and 3.27(99-04), 28 splines. People. By the term "Lower gear ratio" people mean a 4:10 to 3.73, 4:10 is lower. The average gear ratio upgrades are 3.73 and 4:10. There are many different options tho such as 3.45, 3.73, 4.10, 4.56, 5.13. Anything above 4:10's are not street friendly. Going to a lower gear ratio will hurt your gas mileage, but nothing noticeable, it will also hurt your top speed, prolly 130 with 4:10s. The gains will be even greater. They really help out your acceleration and you will have the "Grin Factor" For a week. There is nothing wrong with buying used gears, just check for any chipped teeth or wear.
To help get your power to the wheels you should also invest in a posi unit. The most simple and easiest is a Ford T-Lock. T-Locks are stock in Mustang GT 8.8s. They have clutches inside that can wear out over time. T-Locks are recommended for cars with less Power. If you plan on using any kind of power adder, or going with allot of upgrades A Auburn or Det Truetrac is for you. A locker will do as the name implies, it locks both rear tires for best traction. There are two types, a Locker, and limited slip.
Gears are a very good modification that most people overlook. It doesn't add HP, but it gets you up and going.
A Girdle is recommended for higher powered cars, it gives that added support needed. It also adds to the fluid capacity so your fluids will not run as hot.
With this new found power you will also need to correct your speedometer. If you have a 94-98 all you need is a little plastic recalibrator, for 99-04 you will need a tuner. A Gear and Locker Installed will run you Gears(Used) $50 Gears(New) $175 Locker $250-$510 Installation $300
nice info. a good upgrade for a v6 would be a stock mach 1 rear end. they come with 3.55 gears and the 8.8 tlok. if you could find one for a good price it would be a nice upgrade
hey i put my own gears in. and when i put them in i noticed on the retainers (that hold the bearings and shims in) that there is little arrows, do they face in or out towards the axles? - thanks
Avoid buying your gears from National Drivetrain. Their gears don't fit in our stangs and it cost me $100 for shipping and my stang hanging in the lift for 5 days because their MotiveGear3.73 dont fit! Refund is a pain in the a## charging me $100 bucks for shipping as if it's my fault why I bought my gears through them. BADDD customer service so beware!
I was wondering how far will my 98 be off from the actual speed if I were to put in 3.73's? I know that the 28 tooth or whatever speedo gear isn't made for those, but like 3.23's or something, but its the biggest one they make, so how much % will I be off? I could always make up part of the differencer by getting slihghtly larger tires, but how far off would it be with stock tires?
I may get a TLOK and gears (or help buying them) for christmas/birthday, and I think that would be a great mod for the first one (possibly only, who knows).
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Black 98 Mustang V6 5MT
Throttle Cable Tightened Lowered Wiper Arms Intake Silencer Removed Bumper Cutouts Removed Smoked Headlights and Corners K&N Air Filter Black Front Pony
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7.5 Ford Rear end Info - 
