Since I'm building a new motor for my truck I will be needing née motor mounts to. I was considering getting solid motor mounts. What are the pros and cons of using them? Can I use solid tranny mounts to? What would happen if I used solid tranny mounts and solid motor mounts? Pros? Cons? Will it make the whole truck shake at idle since it will be solid?

 

Your drivetrain needs to be able to flex.

Solid mounts would transmit engine noise and transmission noise to the frame.

Bad idea, I think.

 

You can put solid motor mounts, but I would leave the transmission soft. If not, if the chassis flexes too far you will break the transmission tailhousing/mount/etc.


If anything, just put polyurethane motor mounts. Will give you a bit better support, but won't be solid. Leave transmission stock. Still will transmit a good amount of shake to the truck.

 

I don't want to crack my transmission so I'm gonna leave the stock rubber tranny mount. I want the truck to shake and is there a big difference between polyurethane mounts and solid?

 

You do NOT want solid motor mounts. They are rubber for a reason.

Steve can I ask how old you are?

 

15... why?

 

That explains the want for the truck to shake.

 

How's that?

 

You actually DON'T want to do that, your truck ain't gonna shake like you think it will. You've probably ridden in something with a nice built motor and felt how it shook at idle. I can guarantee you whatever you were riding in had rubber or poly motor mounts... they will transmit vibrations just fine if the motor has any to give.

What you'll get if you go with solid mounts ain't gonna be like that, but rather it'll likely be a high frequency, extremely annoying resonance type of vibration as the engine rattles the cab and frame at it's resonant frequency.

You know how some exhaust systems drone in the cab? Well think of that, except with vibrations instead of sound.

When and if you start making enough power to snap flexible mounts then you can consider solid ones, although most people just chain the driver side of the motor to the frame at that point, and still run poly or rubber mounts as the main support.

 

Because of what I just said. The guys are saying you're too young and inexperienced to know any better, and I agree. You don't want solid mounts... it will drive you nuts and nobody will want to ride with you.

 

Are the poly mounts better than the stock ones? I need new motor mounts so that's the reason I'm not sure which kind to get. But I garuantee I won't be making enough power to snap flexible mounts

 

And yes I am young and inexperienced that's why I ask a bunch of questions before I go buying parts that aren't good

 

Sure, poly is an upgrade to rubber because they don't break down as fast over time. There's also a bit harder than rubber while still being flexible.

 

Should I get poly transmission mounts to? Or just leave those rubber?

 

You want rubber mounts unless you have some sort of all out track truck.

And what makes you think you need motor mounts anyway? They are not that common to go bad.