Motor mounts 383? What’s the deal ?

[Purepony]

So on my challenger I remember the motor mount went out every 90 days until I added two counter shrunk bolts to sandwich and keep everything together. It was suggested at the e body forum and worked

So this got me thinking since my car seems like I needs a Trans mount but since on the subject how are the motor mounts in these things ? 70 satellite 383

Is it the same 90 day junk glued together like my challenger 1970 small block ?

 

[Jerry Hall]

Before I restored my Superbird, I would have to replace a left side motor mount every time I launched the car hard. I did the same on my motor mount and eliminated the problem. I blamed it on somewhat sticky tires and the 2.76 rear axle. I haven't had problems with transmission mounts. They just seem to get old and compressed. I have gotten junk transmission mounts that require a metric nut. I refuse to use those.

 

[493 Mike]

Chinese rubber is NOT a good quality like OEM. Just install a restraint.
Mike

 

[Purepony]

So same problem it seems like ? Damn I’m gonna have to replace it

how hard is it ?

 

[Purepony]

Before I restored my Superbird, I would have to replace a left side motor mount every time I launched the car hard. I did the same on my motor mount and eliminated the problem. I blamed it on somewhat sticky tires and the 2.76 rear axle. I haven't had problems with transmission mounts. They just seem to get old and compressed. I have gotten junk transmission mounts that require a metric nut. I refuse to use those.

Thanks Jerry I’m starting to think ThTs my problem the mount

 

[multimopes]

I think that Shumacker or some similar in name made inexpensive strap systems to mount on the drivers side. They were available for up to and including 72 model year. Of course, my 73 with the big rubber donuts at the K frame are out of luck. I did however try to contact them and I think they went out of business due to Covid or something, not sure. I broke mine on my old 70 Challenger RT as well and used a home made torque chain for a while.

 

[Dave6T4]

I used to break left side motor mounts on my one-of-none 1967 Coronet R/T station wagon. I built it with a 440/4-speed and 3.55 gears on a Suregrip 8 3/4". The combination of my heavy right foot, heavy launches, and a heavy car resulted in a few broken mounts. I tried a solid mount on that side, but could not accept the vibration and loose screws and bolts it produced. I found that Year One sold a mount that had floating tabs encased in the rubber mount that would lock together when under torque to prevent ripping the mount in half. Mancini Racing has the same type of mount in their catalogue called Polyloc. They are sold as pairs for less than $200.00. I think I was able to buy only the single mount that I needed at the time (thirty years ago) from Year One. After changing it, I never had another failure. The mounts are not too bad to change. Unbolt one side at a time and either lift or jack that side of engine up to get engine bracket and rubber mount out. Change the rubber mount on the steel bracket and reverse the process. You might be able to get away with changing only the left hand side, as the right side is always under compression.

 

[oldbee]

Chinese rubber is NOT a good quality like OEM. Just install a restraint.
Mike

Chinese rubber,yes. No problem with mine--- Moroso steel mounts on engine since early 70's. Hey, it's not a Cad/Buick/ Olds.

 

[multimopes]

By the way, that Challenger RT was the first car I ever had that had a fan shroud! When the motor mount broke, the fan hit the shroud and made a nice "lathe chewing" sound. It got my attention pretty quick! I had to feather the throttle all the way home. I was lucky the fan wasn't bent!

 

[Nevada dan]

ya , I've bent the hood and the air cleaner on my old super Bee , my dads 70 Imperial had a short cable going from the mount bolts to the block bolts , I stole it off there and put it on mine , he didn't drive it hard enough to do any damage

 

[multimopes]

You know, this brings to mind a story from way back when; sometime in the late 60's. It is relating to motor mount failures on Chevy's and maybe other GM cars. It was about a huge recall on a shitload of vehicles because the motor mount would break and when the motor lifted, it pulled the throttle wide open and jammed the steering shaft causing catastrophe (lot's of accidents). I'm pretty sure about this, not just senility!

 

[GOLDMYN]

You know, this brings to mind a story from way back when; sometime in the late 60's. It is relating to motor mount failures on Chevy's and maybe other GM cars. It was about a huge recall on a shitload of vehicles because the motor mount would break and when the motor lifted, it pulled the throttle wide open and jammed the steering shaft causing catastrophe (lot's of accidents). I'm pretty sure about this, not just senility!

Yeah, I've seen the toque cable on a few GM cars

 

[Durandal25]

I used to break left side motor mounts on my one-of-none 1967 Coronet R/T station wagon. I built it with a 440/4-speed and 3.55 gears on a Suregrip 8 3/4". The combination of my heavy right foot, heavy launches, and a heavy car resulted in a few broken mounts. I tried a solid mount on that side, but could not accept the vibration and loose screws and bolts it produced. I found that Year One sold a mount that had floating tabs encased in the rubber mount that would lock together when under torque to prevent ripping the mount in half. Mancini Racing has the same type of mount in their catalogue called Polyloc. They are sold as pairs for less than $200.00. I think I was able to buy only the single mount that I needed at the time (thirty years ago) from Year One. After changing it, I never had another failure. The mounts are not too bad to change. Unbolt one side at a time and either lift or jack that side of engine up to get engine bracket and rubber mount out. Change the rubber mount on the steel bracket and reverse the process. You might be able to get away with changing only the left hand side, as the right side is always under compression.

View attachment 1097257 View attachment 1097258 View attachment 1097259

....your ride is awesome. I really dig it.

 

[71gtx471]

Back in the late 90s a friend of mine picked up a really clean 66 Caprice 396 4dr.that an old man had,the motor mount broke & the throttle went wide open,scared the poop out of the old guy & he sold the car.