A-5 Gear Kit 1985-93 Mustang 5

A-5 Gear Kit 1985-93 Mustang 5.0L


A-5 Gear Kit for 1985-93 Ford Mustang 5.0L

Out of stock

Product Description

New Upgraded A-5 Gear Kit for 1985-93 Ford Mustang 5.0L T-5 World Class 5 Speed Transmission.

-9310 Upgraded Alloy 1st thru 4th Gear Kit
-Can be built with Additional Upgraded Components to Support 600HP in Stock T-5 Casing
-Installation of just the 1st thru 4th A-5 Gear Kit into Stock Casing supports 485 Torque
-Reduced Helix Pitch allows for Widest/Thickest Tooth Profiles of any Synchronized T-5 Gear Kit
-26 Spline Input Shaft that is 1 1/8" thick for the clutch disc to ride on
-2.95 "Close Ratio" 1st Gear
-All of the 1985-93 Ford Mustang 5.0L T-5's had a .68 Overdrive (5th). Reusing 5th with our A-5 1st thru 4th Set will provide for the Most Fuel Efficient 5th Set, .59 Overdrive.


-Must be installed into a World Class T-5 from a 1985-93 Ford Mustang 5.0L
-1st/2nd Shift Fork has to be modified or the larger diameter 1st Mainshaft Gear supplied will touch/rub it
-Installation of a Reverse Idler Bushing, included with A-5 Gear Kit, is a MUST USE to replace the 0-ring that spaces the reverse idler away from cluster 2nd gear
-1 Qt. of Transmission Fluid (Additive) is included with every A-5 Gear Kit Purchase..Must use Additive in conjunction with approximately 1.75 Qts. of Dexron V
-Pre-Loading of Bearings on Cluster as well as the input bearing by means of Shims is very important


The A-5 Gear Kit has proven to be more of a Seasonal Product for us over the past 11 Years of its existence. So you will see the product being "not available" on our website.  With this being said we run two batches of gear kits a year.  Usually we sell and stock the Gear Kits between February and July/August.  Thereafter or Before, we only sell replacement components for those A-5's already out in circulation. During the time period of us not having the A-5 Gear Kits, we start a "List of Potential Orders" from end Users. If you are interested in getting on this "List" please email sales@astroperformance.com . Please Include your complete name, address (billing and shipping if different), phone number, and that you would like to be notified and/or make a deposit towards the next release of the Upgraded A-5 Gear Kit.  Any customers that do decide to purchase the Gear Kit off the Website that is marked "Not Available" will have the opportunity to be refunded or be put on the other List we create "A-5 Sales".

Additional Information

Weight 27 lbs
Dimensions 13 x 10 x 12 in




Car Year

1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993


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