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Old 10-16-2011, 03:55 PM   #1
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Thumb

Well new prob. I was on the highway yesterday and I went to get around a car. So I downshift and went around but as I was going I heard a loud thumbing sound from my trans area. Wat could it be
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2001 gt, 5speed. 70mm throttle body with stackracing plenum. bbk intake, 4.10 eaton posi, short shifter, o/r side exhuast.
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Old 10-16-2011, 11:40 PM   #2
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Clutch, flywheel, driveshaft, tranny itself. Downshifting is very hard on your clutch
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Old 10-16-2011, 11:52 PM   #3
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As I was giving it more gas it did it. Them went away them did wen I sped up. Idk. Could it be the u joints
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Old 10-18-2011, 07:29 PM   #4
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U joints would make the car vibrate a lot at higher speeds. Might be some teeth on your synchros shot or could be your clutch. Ive seen a Mach 1 do a down shift and blow up the whole clutch into pieces. The Mach 's have a lot of power to that area.
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Old 10-18-2011, 11:40 PM   #5
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It only did it twice. I'll stat in 4 th and speed up then it would do it then go away. Then I'll let off the gas and then cruise and it would do it. But nvr did it again.
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Old 10-21-2011, 03:08 PM   #6
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Re: Thumb

I had that while ago check you tranny and motor mounts the stock ones blow out real easy
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Old 10-21-2011, 03:37 PM   #7
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Well my tranny mount is new. My motor mounts r stock rubber the trannys not.
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Old 10-21-2011, 03:56 PM   #8
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Re: Thumb

I did the same thing the tranny mount was replaced on mine first at that time the motor mounts were fine not long after that they blew out you cant really tell how bad they are till you take them out. I used a jack on the transmission bell gave it one pump and the engine lifted and the car body didn't move that is how i discovered mine where gone
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Old 10-21-2011, 04:02 PM   #9
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Really. Well my trans mount is urethane and the motor ones r rubber should I use urethane mounts too
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Old 10-21-2011, 04:18 PM   #10
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Re: Thumb

I put an energy suspension tranny on and then went with prothane for the motor they were in stock at the time I think they are both of equal quality
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Old 10-21-2011, 08:19 PM   #11
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How hard is it to replace the motor mounts.
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Old 10-21-2011, 08:57 PM   #12
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Re: Thumb

I replaced the k member with a UPR tubular one when I did it so they just dropped out but you can get away with taking off the starter and pulling them out towards the back of the car there are some really detailed instructions on google if memory serves me a bit of a pain in the neck really also the haines manual helps too good luck hope all goes well
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Old 10-21-2011, 09:37 PM   #13
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Thx.
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