How to Weld an S13 Differential
Welding the differential on an S13 chunk will tie up the axles, causing both rather than one to turn during acceleration. The S13 rear end, often found small 4 and 6 cylinder racing cars, is designed so that only one axle will turn at a time. However, welding the differential gears will create a racing rear end where both axles turn. You can weld S13 differential in two to four hours, depending on your level of experience.
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Instructions
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1
Remove the rear plate from the rear end, and allow the dope to drain into a pan. Flush out the differential with a gasoline to remove the dope from the differential gears. Use a gasoline siphoning pump to circulate fuel into the differential case.
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2
Allow the differential to fully drain and dry before proceeding. Blow out the gears with compressed air to remove remaining fuel from the gears. Clean the gears of the differential with a wire brush to remove dirt and grime. Rotate the gears as you clean them to ensure that they are fully cleaned.
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3
Clamp your welding lead to the axle casing connected to the differential housing. Weld the gears connecting the differential to the axles with 1- to 2-inch wide beads 4 inches long. Weld several passes to ensure that the gears are fully bonded, brushing each pass with a wire brush to ensure proper welding adhesion.
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4
Spin the gears, which will also turn both axles, and weld the opposite side of the gears. Weld the differential in four spots around the differential gears to ensure full attachment of the gears.
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5
Replace the rear end plate, covering the differential gears. Place a new gasket behind the plate prior to reattachment rather than using the old gasket. Fill the chunk with rear end dope, and test the drive gently prior to full use.
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Tips & Warnings
Wear rubber gloved when adding dope to the rear end.
References
- "Collector Car Restoration Bible: Practical Techniques for Professional Results"; Matt Joseph; 2005
- "How to Plan & Build a Fast Road Car"; Daniel Stapleton; 2005
- "1001 High Performance Tech Tips"; Wayne Scraba; 1995
