Strange question

[Brahmajoe]

If you give your gladiator gas in park does the Jeep shift more then your average vehicle or could I need motor mounts? Felt like the whole Jeep tilted. Strange question I know but i did it today and I felt like it was a little unusual.

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[Jefe1018]

If the torque isn’t going to the transmission down the axles and to the tires, it still has to go somewhere. Could it be the motor mounts? Maybe. If you think it is that much of an issue, maybe pop the hood, give it the gas and record it with your phone to see how much the engine moves. Another thing you can try or ask yourself is whether or not you can hear loud bangs when you shift into reverse or drive especially if you’re shifting while in 4Lo.

 

[Brahmajoe]

If the torque isn’t going to the transmission down the axles and to the tires, it still has to go somewhere. Could it be the motor mounts? Maybe. If you think it is that much of an issue, maybe pop the hood, give it the gas and record it with your phone to see how much the engine moves. Another thing you can try or ask yourself is whether or not you can hear loud bangs when you shift into reverse or drive especially if you’re shifting while in 4Lo.

I’ll try the shifting in 4low tomorrow. What would that indicate if I heard the bangs?

 

[Jefe1018]

I’ll try the shifting in 4low tomorrow. What would that indicate if I heard the bangs?

Motor mounts, trans mounts, possibilities could be endlesss. Curious why you’re revving in park through?

 

[ShadowsPapa]

It shouldn't move much unless you are really punching it. Bad mounts would let the engine move but not the rest of the truck. If the mounts are good, the engine will move the whole truck if you punch it hard enough.
people equate truck movement with bad mounts when it's really the opposite. A bad mount will let the engine jump while the truck sits still - because it's not firmly mounted or connected.

So the whole vehicle moving means mounts GOOD.
Engine moving excessively means mounts BAD.

 

[Dryfly24]

My old Nova back in HS had a broken motor mount and when I would give it gas in park the motor would jump and the whole car would lurch and twist.

it’s not hard to figure out. Pretty easy to tell if you just have someone rev it while you look at the engine. If the engine is moving you probably broke a mount.

 

[ShadowsPapa]

My old Nova back in HS had a broken motor mount and when I would give it gas in park the motor would jump and the whole car would lurch and twist.

it’s not hard to figure out. Pretty easy to tell if you just have someone rev it while you look at the engine. If the engine is moving you probably broke a mount.

It shouldn't have done that unless other factors were in play - watch drag racing and the guys with solid mounts compared to factory mounts. Factory mounts flex, preventing body twist unless the mount's SAFETY caught and twisted things or the transmission/bell housing came up against the tunnel.
There's also no reason for the chassis to twist if it's in park - the engine isn't loading anything up. It's simply revving and as the crankshaft tries to turn one direction, the block wants to turn the other. Mounts should flex and prevent that but some of that twist will transmit to the chassis.
If a mount is broken, one side of the engine can raise up, letting the body stay put.
A broken mount usually lets the engine move independent of the body.
Good mounts tie the two together, and in a unibody car if your engine has enough torque, you can literally crack things - thus, subframe connectors.

In park, the engine can rev without resistance. Crank wants to spin one way but due to the mass and inertia of the rotating mass, the block ends up trying to go the other direction - opposite reaction. If it's tied down, it takes the chassis with it. If the mount is broken, the block twists, body should stay at rest.

Mounts allow the engine to twist and vibrate and not transmit any of that motion to the body or chassis.

Safety catches were put into motor mounts somewhere in the late 60s because if a mount broke, the engine would shift and twist independent of the body and bind the throttle linkage. Then they went to a throttle cable around 1970 or so, so that if a motor mount broke, safety or not, the engine could not lift in the chassis and bind the throttle open. So a broken mount meant the engine moved, lifted, body did not.

Anything is possible, but a broken mount on these should be very rare indeed. Worth checking - but odds are against it. It takes a lot of torque to bust 'em and that means torque applied IN GEAR, not sitting revving it in park because all you are doing is spinning the flywheel, there's no load on it, no reason to stress a mount. Stress is being in gear, generating maximum torque from the engine with a load on it.

 

[Dryfly24]

It shouldn't have done that unless other factors were in play - watch drag racing and the guys with solid mounts compared to factory mounts. Factory mounts flex, preventing body twist unless the mount's SAFETY caught and twisted things or the transmission/bell housing came up against the tunnel.
There's also no reason for the chassis to twist if it's in park - the engine isn't loading anything up. It's simply revving and as the crankshaft tries to turn one direction, the block wants to turn the other. Mounts should flex and prevent that but some of that twist will transmit to the chassis.
If a mount is broken, one side of the engine can raise up, letting the body stay put.
A broken mount usually lets the engine move independent of the body.
Good mounts tie the two together, and in a unibody car if your engine has enough torque, you can literally crack things - thus, subframe connectors.

In park, the engine can rev without resistance. Crank wants to spin one way but due to the mass and inertia of the rotating mass, the block ends up trying to go the other direction - opposite reaction. If it's tied down, it takes the chassis with it. If the mount is broken, the block twists, body should stay at rest.

Mounts allow the engine to twist and vibrate and not transmit any of that motion to the body or chassis.

Safety catches were put into motor mounts somewhere in the late 60s because if a mount broke, the engine would shift and twist independent of the body and bind the throttle linkage. Then they went to a throttle cable around 1970 or so, so that if a motor mount broke, safety or not, the engine could not lift in the chassis and bind the throttle open. So a broken mount meant the engine moved, lifted, body did not.

Anything is possible, but a broken mount on these should be very rare indeed. Worth checking - but odds are against it. It takes a lot of torque to bust 'em and that means torque applied IN GEAR, not sitting revving it in park because all you are doing is spinning the flywheel, there's no load on it, no reason to stress a mount. Stress is being in gear, generating maximum torque from the engine with a load on it.

Mount on the passenger side of the engine was broken which in turn made the motor lurch up and make the whole car jump. Just as if a heavy person was to jump up and down on the passenger seat, one side of the car would move up and down. It’s really pretty simple.

I don’t know if it shoud have done that or not. Just reporting what occurred.

 

[Gvsukids]

If you give your gladiator gas in park does the Jeep shift more then your average vehicle or could I need motor mounts? Felt like the whole Jeep tilted. Strange question I know but i did it today and I felt like it was a little unusual.

Take a video.

 

[sharpsicle]

If you give your gladiator gas in park does the Jeep shift more then your average vehicle or could I need motor mounts? Felt like the whole Jeep tilted. Strange question I know but i did it today and I felt like it was a little unusual.

Shifting of the vehicle when revved isn't an indicator of bad motor mounts. That's fairly normal. What is an indication is shifting of the motor inside the engine bay when revved.

I don't know what you consider your "average vehicle" so it's hard to say if it is or isn't more than that.

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