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Rear Differential Upgrade - Project Silver Stealth Stang

Project Stealth Stang Pinion Gear
Just like the diff bearings,... 
   
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Project Stealth Stang Pinion Gear
Just like the diff bearings, the pinion gear bearing was pressed on as well.
Project Stealth Stang Grease Housing And Bearings
Don't forget to add grease... 
   
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Project Stealth Stang Grease Housing And Bearings
Don't forget to add grease to the housing and the bearings when replacing the axle bearings.
Project Stealth Stang Tap Bearing
Tap the bearing into place.... 
   
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Project Stealth Stang Tap Bearing
Tap the bearing into place. When installing the companion flange and pinion gear with crush collar, do not use the impact gun to seat it.
Project Stealth Stang Backside
The backside is ready to receive... 
   
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Project Stealth Stang Backside
The backside is ready to receive the guts.
Project Stealth Stang Install Differential
Install the differential along... 
   
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Project Stealth Stang Install Differential
Install the differential along with the axle bearings and shims.
Project Stealth Stang Carrier Bearing Caps
The carrier bearing caps are... 
   
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Project Stealth Stang Carrier Bearing Caps
The carrier bearing caps are torqued down at 85 lb-ft.
Project Stealth Stang Lpw Cover
The LPW cover is bolted back... 
   
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Project Stealth Stang Lpw Cover
The LPW cover is bolted back on and the rear filled with fluid. The Silver Stealth Stang was ready for action. These two modifications enabled the car to run a best of 13.62 at 99.93 mph.
Project Stealth Stang Comparison Units
A comparison of the two units... 
   
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Project Stealth Stang Comparison Units
A comparison of the two units shows the size difference. Internally, P.P.C. modified the guts to be stronger and custom tailored the fins to let the engine rev through converter slippage before it grabs and transfers the most power.
Project Stealth Stang Swap Torque Converter
After we tested the larger... 
   
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Project Stealth Stang Swap Torque Converter
After we tested the larger gears and lighter driveshaft, we decided to swap to a looser torque converter. We went back to Radical Racing and they had the transmission removed rather quickly.
Project Stealth Stang Torque Converter
We got a torque converter... 
   
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Project Stealth Stang Torque Converter
We got a torque converter from Pat's Performance Converters. It is a 10-inch unit, but still retained the lock up functions, helping with fuel mileage at highway cruising speeds. We went with a 2,800 rpm stall speed to help move this 3,460 pound Mustang quicker down the track.
Project Stealth Stang Stock Unit
Here is the stock unit, a... 
   
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Project Stealth Stang Stock Unit
Here is the stock unit, a 12-inch torque converter that had a stall speed of only 2,000 rpm. It was far too tight to get the engine into its powerband. The larger rear gears helped, but a higher stall speed goes a long way in automatic-performance.
Project Stealth Stang Input Shaft
The input shaft sticks out... 
   
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Project Stealth Stang Input Shaft
The input shaft sticks out of the transmission pump, the center portion of the transmission in this photo. This is where the torque converter slides.
Project Stealth Stang Ppc Torque Converter
The P.P.C. torque converter... 
   
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Project Stealth Stang Ppc Torque Converter
The P.P.C. torque converter slides into place, and it was rotated to make sure it engaged the pump properly. Be sure the converter is slid into place properly and fully engaged. The tabs sticking out from the converter are where it bolts to the flexplate, otherwise known as the flywheel in stickshift applications.
Project Stealth Stang Mustang
Unfortunately, we are going... 
   
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Project Stealth Stang Mustang
Unfortunately, we are going to have to wait for a clear day to get some results. The weather was cold and rainy at press time, preventing us from testing at any dragstrips in the Northeast. Our expert opinion is this car will go 13.40s, maybe even 13.30s--if we get the tires to hook decently.
Project Stealth Stang Transmission
The transmission is bolted... 
   
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Project Stealth Stang Transmission
The transmission is bolted back into place and the torque converter is bolted onto the flexplate. Radical Racing's staff then bolted on the Axle Exchange driveshaft and reinstalled the Bassani x-pipe. It was time to hit the track.
Axle Exchange
22 Commerce Rd., Unit 1
Fairfield
NJ  07004
Pat's Performance Converters
101 Swarthmore Ave
Folsom
PA  19033
Downs Ford Motorsport
360 Route 37 East
Toms River
NJ  08753
Radical Racing
687 Jackson Rd.
Atco
NJ  08004

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