The factory dogbone in my V6 was junk so I put in an adjustable RD dogbone intending to put all poly on the motor and tranny. Question: When I took the old dogbone out the motor rocked forward about 1/2" or 3/4". Should I put that preload back into the motor mounts or should I adjust the dogbone to fit the motor where it rests? For now it is adjusted to fit the motor as it rests but the drivetrain still feels like it is moving a little too much when I shift.

The reason it moved is that your engine/tranny mounts are sagging. Adjust it to the length of the factory dog-bone and replace the worn mounts.

Gotcha, guess I'll be ordering the rest of the poly mounts.

I see WCF and RD poly driveline mounts cost pretty much the same. I thing the WCF transmission mounts look better but I would rather buy from Rodney. What would you do?

quote Originally posted by FieroBrad87: I see WCF and RD poly driveline mounts cost pretty much the same. I thing the WCF transmission mounts look better but I would rather buy from Rodney. What would you do?

Rodneys mounts are great ...

That's probably what I'll do. I'm going to put poly cradle mounts in it while I'm there.

I always had to pull the engine back to get my stock dogbone in place. After replacing all the mounts I didn't have to move the engine much at all. On the auto, one of the trans mounts is easy, the other is a PITA to replace. The engine mount is very easy.

Well I've got a 4 speed muncie...

Did you replace the mounts with poly? That may be a dumb question I'm not sure.

[This message has been edited by FieroBrad87 (edited 04-22-2008).]

I would buy the mounts from Rodney. They have a much better chance of actually fitting. See this thread for details.

quote Originally posted by FieroBrad87: The factory dogbone in my V6 was junk so I put in an adjustable RD dogbone intending to put all poly on the motor and tranny. Question: When I took the old dogbone out the motor rocked forward about 1/2" or 3/4". Should I put that preload back into the motor mounts or should I adjust the dogbone to fit the motor where it rests? For now it is adjusted to fit the motor as it rests but the drivetrain still feels like it is moving a little too much when I shift.

yes - preload it. but 3/4" is to much - 1/4" to 1/2" with rubber, 1/8" to 1/4" with poly.
it will actually cause bucking if the preload is to much

Stock V6 Fieros don't have driveline absorbers, do they?

[This message has been edited by FieroBrad87 (edited 04-23-2008).]

quote Originally posted by FieroBrad87: Stock V6 Fieros don't have driveline absorbers, do they?

Pretty sure my 87GT has one.

quote Originally posted by Electrathon: The reason it moved is that your engine/tranny mounts are sagging. Adjust it to the length of the factory dog-bone and replace the worn mounts.

Exactly what I thought. I replaced all my mounts and still had the dogbone out by about 1/4". I did not want to preload the dogbone by forcing it in to place. I noted that the engine side mount for the dogbone did not olt directly to the block. It bolted to another steel piece that then bolted to the block. I made a 1/4" spacer to go between the two pieces (see pic). This forced the mount to line up. I don't like that I had to do it, but could not think of anything else.

quote Originally posted by sjmaye: Exactly what I thought. I replaced all my mounts and still had the dogbone out by about 1/4". I did not want to preload the dogbone by forcing it in to place. I noted that the engine side mount for the dogbone did not olt directly to the block. It bolted to another steel piece that then bolted to the block. I made a 1/4" spacer to go between the two pieces (see pic). This forced the mount to line up. I don't like that I had to do it, but could not think of anything else.

Once I put the poly mounts under the motor and transmission and I suppose a new driveline absorber I will set the adjustable dogbone to wherever it is comfortable.

In a sense that is what I did. I like the adjustable dogbones, but was afraid of the potential for vibration associated with poly. I wanted to use rubber. Not having an adjustable rubber-mount dogbone this is the best I could think of at the time.

[This message has been edited by sjmaye (edited 04-25-2008).]