C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ZF tranny question.....sort of.......

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Old Oct 23, 2002 | 05:58 PM
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Default ZF tranny question.....sort of.......

With my car's shifter in a low gear, like maybe 3rd, (where I have lots of torque) I can feel the shifter move slightly in my hand as the engine/tranny torques when I accelerate hard (slam the pedal :D ). It moves sort of side-to-side, but only very very slightly. You can feel it move but probably would have a hard time seeing it move (if at all).

Other than this it feels solid & shifts smoothy into & out of all gears.

So, is this normal or should I have my mechanic looking for tranny mount issues, etc.???

If it matters, the car is a '96 LT4 with 56,000 miles & is stock.


Thanks guys,
David


[Modified by DCP, 5:01 PM 10/23/2002]
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Old Oct 23, 2002 | 06:17 PM
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Default Re: ZF tranny question.....sort of....... (DCP)

I don't think you need to worry, as mine does the same thing. All my standard cars did it, I'm thinking it's alright. :seeya
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Old Oct 23, 2002 | 06:42 PM
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Default Re: ZF tranny question.....sort of....... (93TorchRedC4)

Hmmm, you may consider finding another late model zf6 owner and ask him if its ok to ride along and see how the shift mechanism feels during various torque applications. Then you could compare.

Merely speculation but I would evaluate my motor mounts, transmission bell housing bolts, shift mechanism, etc with a visual inspection. Make sure everything is tight, all bolts/nuts present. I don't recall that much torque feel on my 90's shifter, but pretty subjective so can't really say.

Check and make sure.

dlmeyers 90 coupe zf6 3 speed shocks
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Old Oct 23, 2002 | 07:57 PM
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Default Re: ZF tranny question.....sort of....... (DCP)

If it is a very slight side-to-side, I think you are fine. This is likely a result of the motor mounts flexing.

You may want to check the torque-arm bolts that fasten the back-bone to the ZF and at the rear to the diff. Make sure all 4 are VERY tight & torqued to the proper specs. As these loosen, you'll notice a distinct up/down movement of the shifter as you accelerate. This is the warning sign that they need some attention.
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Old Oct 23, 2002 | 07:59 PM
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Default Re: ZF tranny question.....sort of....... (Joe90)

ditto the torque arm bolts...I've heard several stories about them being loose.
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Old Oct 24, 2002 | 12:31 AM
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Default Re: ZF tranny question.....sort of....... (DCP)

Thanks guys!! I'll check out your suggestions.

Man, you guys are a wealth of knowledge!!! :cheers:


David
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Old Oct 25, 2002 | 05:30 PM
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Default Re: ZF tranny question.....sort of....... (DCP)

it's very common for the c beam torque arm bolts to get lose.

if side to side movement becomes excessive, also check for broken motor and transmission mounts.

the bolts on the c beam tend to "dig into" the alum and lose torque.

the c beam plates fix that problem and make mounting the c beam easier.

email me if you'd like a set.
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