3:73 TL, Mark Viii DS, F150 S-clip - TCCoA Forums
 
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post #1 of 6 (permalink) Old 12-22-2010, 10:08 AM Thread Starter
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3:73 TL, Mark Viii DS, F150 S-clip

I have a 95 4.6 t bird with a factory TL diff. This summer I added Richmond 3:73 gears, a 93 Mark Viii driveshaft, forced lube kit and the F150 S clip. Ever since then I've been chasing around a "thunk" from the rear of the car that you can hear and feel and I can't find it. It does it when you come to a stop and it downshifts into first or when I'm going thru a parking lot under light throttle. It's also started something else. When I turn a corner from a stop, it will make a louder rumble, kind of "slipping" noise from the rear. Maybe clutch noise? I've taken it to the shop where I had everything put in, he used to work at the Ford dealership and went solo, and he checked the backlash and inspected everything and said it was ok. I just replaced the front diff bushings with poly from SCP and replaced the rear diff mount bracket and no help. It's back at the shop again so the mechanic can drive it and see what it's doing. Has anyone else had these issues with these mods on their cars? If so, did you get it figured out? It's driving me nuts!

Thanks
Mike
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post #2 of 6 (permalink) Old 12-22-2010, 07:06 PM
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Did you add the trac-lok additive? I've read and heard from people that the GM posi additive is far superior to any of the others. A common misconception is that the additive is used to make the clutches grab, when in fact, the opposite is true. Without the additive, your clutches "jerk" when they slip; the additive LOWERS the friction making it slip smoother (same with the additive in transmissions - go figure).

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post #3 of 6 (permalink) Old 12-22-2010, 07:27 PM
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I am wondering if it isnt TL clutch chatter too. That will make the popping/thumping sound while in turns. I always just use 80w90 with a quart of lucas oil stabilizer for friction modifier.

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post #4 of 6 (permalink) Old 12-23-2010, 10:39 AM Thread Starter
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That's what I was thinking, it's the clutches. I'm assuming the mechanic put gear oil with additive back in it when he put the gears and S-spring in for me. When I told him about it, he was thinking it might need a different additive. Also it only thunks when I come to a stop or driving parking lot speed under light throttle. He still has my car so I'm calling today to see what he found out.

Mike
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post #5 of 6 (permalink) Old 12-23-2010, 02:15 PM
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Quote:
Originally Posted by mh68 View Post
I have a 95 4.6 t bird with a factory TL diff. This summer I added Richmond 3:73 gears, a 93 Mark Viii driveshaft, forced lube kit and the F150 S clip. Ever since then I've been chasing around a "thunk" from the rear of the car that you can hear and feel and I can't find it. It does it when you come to a stop and it downshifts into first or when I'm going thru a parking lot under light throttle. It's also started something else. When I turn a corner from a stop, it will make a louder rumble, kind of "slipping" noise from the rear. Maybe clutch noise? I've taken it to the shop where I had everything put in, he used to work at the Ford dealership and went solo, and he checked the backlash and inspected everything and said it was ok. I just replaced the front diff bushings with poly from SCP and replaced the rear diff mount bracket and no help. It's back at the shop again so the mechanic can drive it and see what it's doing. Has anyone else had these issues with these mods on their cars? If so, did you get it figured out? It's driving me nuts!

Thanks
Mike

I had that clunk , it is the Differential , most likely the pinion is loose or the bearings are shot.

I replaced that diff with my stocker and no more clunk .

Thanks

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post #6 of 6 (permalink) Old 12-24-2010, 02:59 PM
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Take out that F-150 S Spring and use a regular one. Most of the time those just won't fit or even if you do get it in it's distorted. the S spring is only there for low traction surfaces like snow / ice. In high load situations like hard acceleration on dry pavement the spring doesn't do much. The spider gears are jammed tight forcing the side gears outward tightening the clutch packs in which case the spring is just there for the ride.



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