Hey guys, I'm hoping for some opinions about my issue. I have a vibration/ jerking feeling while driving when I hit about 1900 rpm. It doesn't matter what gear I'm in, it is not related to speed. I have a manual transmission and can feel it most list it's coming from the transmission or engine.
I have good motor mounts.
I have a consistent idle.
New U-joints

I felt the transmission mount today and I can push the transmision back and forth about 1/2" to 3/4". Is that too much?
I also feel a clunk when I let off the gas in gear.

Thanks for the help!

 

Change the mount.

 

Yeah, double check motor and transmission mounts

 

Ok, that's what I'll do.
I am looking at a Crown one, because all the other brands have reviews that say they are trash. Any recommendations?

 

I just installed this one from DEA
I also used TRQ pile mounts
Both identical to the OEM ones they replaced.

 

I saw the DEA Mount, but it was the cheapest option on rock auto at $10 and I didn’t trust it. I got the crown automotive one.

I’ll let everyone know the quality of it when it arrives. Seems like it’s kind of a challenge to find a quality replacement now that the Mopar part is no longer available.

 

Well, as I mentioned, it's identical to the factory one I removed, probably came off the same tooling as the OEM one.

 

So, I replaced the transmission mount. The Crown mount turned out to be very nice. It did not fix the issue. I still have a jerking vibration at about 2000 rpm. It is usually under load like going up a hill, and sometimes if I am really steady with the pedal can I can get it above 2000rpm without feeling it. What should I try next. I did notice that my slip yoke seems to have a bit of play. Not in and out like it's designed to do, but I can wiggle it up and down quite a bit in the spline. Is this normal? Do you guys have any other ideas?

Here is the Crown mount next to the original.

 

Is this lifted? Also if there's run out on the slip yoke, this can be problematic, if you checked wheel balance, then the yoke, or drive shaft is out of balance

 

It is not lifted. What is "run out on the slip yoke". My driveshaft does have a few dents but it has been fine in the past. Maybe it was slightly out of balance and over time wore out the slip yoke and u-joints?

 

run out being the amount of movement up and down on the splines of the yoke.

Dents? Did you knock the balancing weight off?

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No, I didn't knock anything off. It has dents in it like it took a few hits off road. I know a dented driveshaft is a big no-no, but I haven't had issues before. It seems like it has gotten worse over time.

 

If you were closer I'd give you my long snout housing, shaft, bearing and drive shaft

 

I really need help if anyone is willing to offer ideas. I don't know why I was thinking slip yoke, because the slip yoke is connected to the driveshaft. It can't be the cause of a vibration that is not relative to speed.
What else causes engine vibration? It is a jerking feeling. Where should I be looking? Is the issue ignition? CPS? Coil?

 

I'm replacing the CPS today. I tested it and was getting .2 v rather than the .5-.8 I am supposed to get. With a selection of extensions, I was able to remove it in about ten minutes. Bought a replacement at napa, so hopefully it's ok.