Trans Knocking.

[QuickTop]

My 4L60E makes a pretty hard thud noise right under the console when i accelerate hard or it shifts hard, im thinking its a trans mount. Has anyone had any experience with the energy suspension mounts. I've heard they are super tough but give too much vibration. I can handle a little vibrating but not earthquakes.

[hoogiesngrinderz]

Get a stocker, you aren't making enough power to need a poly. Good rule to follow: The trans mount should never be harder than the motor mounts.

[QuickTop]

will a stock mount be able to hold up to a mildly built trans?

[meissen]

While I understand what Mike is saying, I disagree -- instead of going with a stock mount, I'd take the time to put poly mounts on the engine and trans at the same time.

[hoogiesngrinderz]

While I understand what Mike is saying, I disagree -- instead of going with a stock mount, I'd take the time to put poly mounts on the engine and trans at the same time.

Which is what I said (in a way )

I wouldn't bother with the extra cost involved on a stock LT1. Just my opinion though.

[hoogiesngrinderz]

will a stock mount be able to hold up to a mildly built trans?

Yes.

[QuickTop]

Yes.

Well then im all set, thanks guys!

[TrickyTransAm]

Before I would do anything....I would pull the inspection cover off and check your torque converter bolts.

A loose converter bolt will sound like a rod knock when starting, as well as when idling etc.

[killa89trans]

I agree id check torque converter bolts, and also check mount make sure not broken/rubber splitting/or tearing.

[QuickTop]

Before I would do anything....I would pull the inspection cover off and check your torque converter bolts.

A loose converter bolt will sound like a rod knock when starting, as well as when idling etc.

I'm pretty confident the only knocking ive got is from my alternator or somewhere in my
belts. Ill check those bolts while I'm under there. But will a loose bolt cause big, hard thuds upon acceleration and hard shifts?

I agree id check torque converter bolts, and also check mount make sure not broken/rubber splitting/or tearing.

i checked mount on the tail of the trans and I looks pretty cracked out and dry.

[c0ncEpT]

Change your trans mount with a stock mount. There is pretty much no reason to go with a poly trans mount. Unless your girl likes the vibrations...

[JoeliusZ28]

Or you have an M6 and you prefer your transmission not jumping through your console

[c0ncEpT]

If your motor mounts were strong enough your trans wouldn't be jumping through your console. The trans can only move as much as the motor.

You can break bellhousings when your trans mount is stronger than your motor mount.

[JoeliusZ28]

Eh, i dont see it that way personally. Engine mounts handle rotational torque of the engine and mine still do fine at that because my headers have many opportunities to hit in various places if they didnt. What im not seeing is, Why would you control the vertical motion of a trans from an engine mount where you have no leverage? What purpose does the trans mount serv if not holding the trans vertically? By the sheer appearance of it, it obviously doesnt have much rotational leverage.

Also, Its a different ball game with an M6. (so sorry for the hijack) The trans weighs a lot more, there is also no converter to absorb driveline shock that causes it jump in the first place, and the shifter is direct to the trans so what is already amplified is now in your face. I dont doubt that people have broken bellhousings, but theyre also probably launching on stickies at 5k rpm where youre asking to find a weak link somewhere anyway (and nor would my stock engine mounts be sufficient). I dont see my poly mount putting enough strain on my bellhousing to make it break. And in the 9 years ive owned my car it hasnt. I fear much less for my bellhousing than everything else that gets put under stress when wheel hop starts happening from the torque arm moving around with the trans.

For the OP, i see no need for anything more than a stock mount with an auto

[killa89trans]

id probably replace it if its cracked and dry rotted out