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Sledgehammer bang shifting hard out of 1st gear

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Old 11-03-01, 05:50 PM
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Unhappy Sledgehammer bang shifting hard out of 1st gear

Whenever I wind the car out in 1st and shift second hard, something in the rear bangs like I just got hit with a sledgehammer or got rear-ended. The car has a lot of slop off and on the gas in the drivetrain. Other than that, I don't have any problems driving the car. No trans syncro issues, and I replaced a leaking RR shock with 4 new Tokico's. What could it be? Did I blow the rear differential mounts?
Old 11-04-01, 11:14 AM
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No one has any ideas? Maybe I cracked the Power Plant Frame?
Old 11-04-01, 08:30 PM
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?
Old 11-05-01, 06:51 AM
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Does sound more like the PPF than the diff mounts. Easy to check though, once you get underneath the car.....
Old 11-05-01, 10:20 AM
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BACKFIRE! BOOM!

How does it sound like? Metal on metal contact? Or just a loud shoutgun sound?
Old 11-05-01, 11:03 AM
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Same Noise

I have the same noise, when I shift. Sounds like a huge clunk.
Is there and after market PPF that would be stronger? Can you weld or strengthen the stock one?
Old 11-05-01, 01:05 PM
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Not a backfire, just a feeling like I was just rear-ended. I get a little bit of popping from the exhaust, but that is only at low rpm.

If it is the PPF, I'll probably get the MazdaSpeed one from:

http://www.rx7.com/cgi-local/3catalog.cgi?cat=2&part=7

Does anyone have it cheaper?
Old 11-08-01, 12:21 AM
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Try Jason above at RX-7 store. Alot cheaper!
Old 11-08-01, 06:54 AM
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Yeh, I contacted him. His price was much cheaper. Just wish I'd have time to get under this thing and figure out what it is. I already know the toe links are bad, but I doubt this is the problem.
Old 11-10-01, 06:36 PM
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I can't figure out what is wrong with this thing. The only thing I can find is that the toe links are bad and there is a lot of play in the ring-and-pinion. I see that I have a sub frame connector(pipe) from the rear subframe to just fore the u-joint. Is there supposed to be a matching one on the right side? Looks to have the same bolt holes for it.
Old 01-17-02, 11:33 AM
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Just curious if you ever found the problem. I have the exact same symptoms and was searching for answers. Haven't crawled under the car yet to look for anything since I haven't had the car long and don't even know what to look for!

If it turns out to be the diff mounts, should they be replaced with stock ones? I know there's tougher ones out there, and even heard of solid ones, but it seems like Mazda made them soft for a reason. Is it to protect things like the gears and u-joints, or just to smooth out rough shifts, or they were cheaper, or what?

Thanks for any advice...
Old 01-17-02, 12:02 PM
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what kind of clutch do you have?

since the first day i got a racing clutch (3 puck) in my FD, the same noise started. almost everytime i shift, CLUNK!!! it will sound like its comming from LSD area.

as fellow members mentioned already, it could be your PPF. just check visually.

just FYI, i regret that ive got 3-puck clutch. it is just too harsh too drive on the street. (not impossible though ) im planning to replace it with ACT SS clutch when i get my tranny rebuilt.
Old 01-17-02, 12:47 PM
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Actually my clutch is worn out and just started slipping (plan on fixing in the next week or so). As far as I know, it's stock.

I've been trying to do research on what clutch to get. I'm about to settle on the SR ACT street/strip/Al flywheel combo. Sound reasonable for a daily driver? I'm used to a light flywheel, but I don't want the clutch to be TOO binary.

How do you check the PPF? I'll search around for that now.....
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