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SN95 Cobras
Pinion Seal
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<blockquote data-quote="SNAKEYE" data-source="post: 3198852" data-attributes="member: 22534"><p>Mine leaked after having 4.10's installed. I swear the guy who installed the gears didn't replace the original seal. I didn't own the car then, just inherited the problem! Why else would a new seal leak? I did a replacement awhile back. You are going to need a large deepwell socket to fit the pinion nut, 1/2" drive, and a nice, long breaker bar. After dropping the driveshaft (easy, just four bolts), removing the pinion nut and pulling the yoke, I carefully pried the old seal out of the housing with a screwdriver tip. Then came installing the new seal (about $12 from Ford). Without a tool to press the new seal in I had to become inventive. I made a ring out of #12 solid copper wire. The diameter of the ring was equal to the OD of the seal flange minus (1) wire diameter. I taped the wire ring to the front surface of the flange of the seal, slipped it on the shaft of the yoke, slipped the yoke onto the pinion shaft, and pressed the seal into place by tightening the nut until the seal flange seated on the housing. Then I backed off the nut and removed the wire ring, and tightened the nut. I have no idea how much torgue I applied, just all I could while lying beneath the car. That was about 28K miles ago and there hasn't been a drip since. If you think you've lost any amount of gear oil top it up thru the plug in the left front of the housing. If you think you lost a lot of gear oil you may have to add the friction modifier ($5) to keep the rear from chattering. There ta go, not surprises, just grunt work!</p></blockquote><p></p>
[QUOTE="SNAKEYE, post: 3198852, member: 22534"] Mine leaked after having 4.10's installed. I swear the guy who installed the gears didn't replace the original seal. I didn't own the car then, just inherited the problem! Why else would a new seal leak? I did a replacement awhile back. You are going to need a large deepwell socket to fit the pinion nut, 1/2" drive, and a nice, long breaker bar. After dropping the driveshaft (easy, just four bolts), removing the pinion nut and pulling the yoke, I carefully pried the old seal out of the housing with a screwdriver tip. Then came installing the new seal (about $12 from Ford). Without a tool to press the new seal in I had to become inventive. I made a ring out of #12 solid copper wire. The diameter of the ring was equal to the OD of the seal flange minus (1) wire diameter. I taped the wire ring to the front surface of the flange of the seal, slipped it on the shaft of the yoke, slipped the yoke onto the pinion shaft, and pressed the seal into place by tightening the nut until the seal flange seated on the housing. Then I backed off the nut and removed the wire ring, and tightened the nut. I have no idea how much torgue I applied, just all I could while lying beneath the car. That was about 28K miles ago and there hasn't been a drip since. If you think you've lost any amount of gear oil top it up thru the plug in the left front of the housing. If you think you lost a lot of gear oil you may have to add the friction modifier ($5) to keep the rear from chattering. There ta go, not surprises, just grunt work! [/QUOTE]
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