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Old 06-11-2010, 05:59 AM   #1 (permalink)
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Default HARD down shifts "thud"

I have a CTR tranny in my ek coupe. I installed the tranny maybe 5000 miles ago and its been great until recently. Now when normal everyday driving (not agressive) like slowing to turn while downshifting its like i just dump the clutch no matter how easy i let out on the clutch. The only way around it is by rev matching on the downshift. Also I have a deep rattling sound at idle that will go away when I push in the clutch.... I'm assuming its the throw out bearing. Like a fool, I reused the old one. it only had ~5000 miles on it as well. Could it also be "hanging" or binding on the input shaft and causing the sudden engagement of the clutch? Or is this a sign of a deeper issue?
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Old 06-11-2010, 06:13 AM   #2 (permalink)
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complete stab in the dark,,, but check the rear engine mount, grab the engine n give it a good rockin back n forth, see it if moves, (from front of car to back)

was drivin an ctr a while ago, n on every downshift the engine would knock against the mount unless i revmatched,

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Old 06-11-2010, 07:15 AM   #3 (permalink)
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Could be, but I think if the mounts where that bad i'd be feeling the shifter moving. I'll check it though.
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Old 06-11-2010, 07:44 AM   #4 (permalink)
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Worn bearings, ISB and other(s) the "clunk" is your input and counter shafts trying to "run away from eachother" under load. Tear down and inspect, then replace.


Wait for bone's confirmation of course
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Old 06-11-2010, 09:08 AM   #5 (permalink)
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i would suspect the rear mount, because with a B you lose the front two.
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Old 06-12-2010, 01:14 AM   #6 (permalink)
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ISB and shitty EK mounts...........
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Old 06-12-2010, 07:28 PM   #7 (permalink)
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ISB and shitty EK mounts...........
I'm gonna start searching now on the ins and outs of replacing the isb. Any links or advise would be greatly appreciated. This will be my first transmission adventure.
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Old 06-14-2010, 10:15 AM   #8 (permalink)
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its simple but easy to fuck up if you are new.

just mark the upward face of everything so you dont put it in upside down.

dont force anything

keep a how-to open on your screen. haha
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Old 06-14-2010, 10:18 AM   #9 (permalink)
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I have to rev-match when downshifting on my Comp STG V clutch...otherwise I get a good amount of chatter. But I don't get any odd noises like you do. I would also suggest looking over your motor mounts.
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Old 06-15-2010, 05:51 AM   #10 (permalink)
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I filled the oem mounts with window weld when I put the ctr tranny in. I've been driving the car for a couple months now with no problems. Its just started all of the sudden. I looked at the sticky about replacing the isb..... I'm nervous lol. What else do I need to look for while this thing is apart? What would be involved if I wanted to swap in a ls 5th gear while its apart?
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Old 06-15-2010, 09:42 AM   #11 (permalink)
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replace the ISB seal as well

and any other parts that show excessive wear.

its usually a good idea to disassemble the shafts and clear them out with compressed air and brake clean. or any other way you can manage to get the debris out.
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Old 10-11-2010, 08:02 AM   #12 (permalink)
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Back from the dead.... Anybody have the ISB P/N for a ctr tranny? Searching now but all I'm finding is d-series.
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Old 10-11-2010, 02:49 PM   #13 (permalink)
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Same as any other hydro B trans.

If you're not comfortable doing it yourself with a Helms I'm not far from KY.
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