Doing motor mounts this weekend and thought it was a good idea to check on the Tranny Mount also.

Judging from these pics, is this Tranny Mount still good, or needs replacement?

 

Cheap insurance to replace the tranny mount at the same time as the motor mounts. If your tranny mount is bad it will wear out your new motor mounts and vice versa. Always want to replace them as a set.

Very simple to replace.

 

Agreed. Head to napa and get their drive tech mounts. Love mine.

 

is it worth buying an upgrade over stock? browndog brand?

 

You'll want to match your motor and tranny mount.

If running rubber motor mounts run a rubber tranny mount, poly motor mounts, poly tranny mount.

I've been running rubber insert brown dog motor mounts with a stock style rubber tranny mount with no issues.

 

That one looks like it's cracked pretty bad but not collapsed. Even so, you might as well change it, because you're supposed to loosen it anyway when you replace the motor mounts. If you have to put a wrench on it anyway, might as well just go ahead and swap it while you're under there.

I would just go with an OEM-style transmission mount. I haven't found anything that really explained any advantage of the aftermarket designs.

Brown Dog motor mounts and brackets are really well made. I have the full BD bracket and mount kit on mine, with an OEM style transmission mount. People complain about the vibration, but I don't mind it at all. And that motor is not going to move.

Certain years of 4.0L motors didn't have the holes drilled deep enough in the block for the motor mount bracket bolts. As a result, the bolt torques against the bottom of the hole rather than against the engine mount bracket, allowing it to vibrate. Over time, that vibration will break the bolt heads right off, causing the engine to suddenly drop on that side, sending the fan into the radiator and twisting your gear shift to the right.

If yours is one of the years affected, you really ought to get the whole Brown Dog bracket kit. It's thicker, so the bolts are torquing against the bracket instead of the hole. It also mounts with additional bolts in extra holes that were tapped in the block but not used. If you're not going to replace the brackets, at a minimum inspect the brackets and bolts while you're under there and consider shimming the bolts so that they're holding the bracket tight.

Keep in mind that BD gives a 10% discount for forum members. That's about $30 off the full bracket and mount kit.

I've been told the exact opposite, that if you're running poly motor mounts, you should run a rubber transmission mount, or vice versa. The reasoning was that the harder poly mounts need a softer point in the triangle to decrease stress on the frame and allow an escape point for vibration.

 

The rubber mount in a poly setup is going to be the weak link. You want the connection between the motor and trans to move (or not move) together. Mixing and matching will destroy whatever rubber mounts you're running.

 

But if you have all three poly and get any kind of twist in the uniframe or torque in the drive line, wouldn't having a poly transmission mount put more stress on the transmission and possibly break the housing? If you want the motor and transmission to move together, you would want one of your mounts to be weaker to reduce stress on the bell housing.

 

I've been running a daystar poly trans mount with the original stock motor mounts for years with zero issues. The motor mounts are still in excellent shape with no signs of excessive wear. I noticed a bit more idling vibration in the cabin from the poly trans mount but nothing I wasn't expecting.

 

I got the motor mounts all done. I used the Energy Suspension 2 1104-G Poly's:

http://www.energysuspensionparts.com/2.1104

And have yet to install the Power Torque

Power Torque AT Trans Mount

They are: Material: Steel, Rubber

If it is bad practice to mix-n-match ploy and rubber, what is a good Poly Trans mount to get?