Anyone break the updated non clamshell motor mounts?
 

Posting this here for discussion and traffic.

I noticed that the trans tower was moving around alot so I checked the trans mount while I was under the truck. It was broken so I replaced it and the problem persisted. So yesterday I pulled the drivers side motor mount and it was busted right at the threaded nut for the frame bolt. This is the new style non separating old style mount. I ripped the metal plate in two horizontally across the entire mount! OOPS. New mount works great but I never saw a mount that ripped the steels apart. It looked to be around 1/16" steel. Possibly thicker. Oddly the motor passed the rev test for visually checking the mount and looked good until raising the motor. Anyone else have this happen?

Re: Anyone break the updated non clamshell motor mounts?
 

It would be great to see pictures of what you are talking about.

Re: Anyone break the updated non clamshell motor mounts?
 

I never posted pics on here. I think I got it figured out so I will snap a picture tomorrow.

Re: Anyone break the updated non clamshell motor mounts?
 

It's a little hard to see but that crack is through a steel plate with a rubberized coating.

Re: Anyone break the updated non clamshell motor mounts?
 

Second pic

Re: Anyone break the updated non clamshell motor mounts?
 

I use to have motor mounts like that, then i burned all the rubber out to them, cut and fabricated 1" metal bars to fit in place of the rubber, welded it all together
and now i have solid motor mounts. That was 5 years ago and haven't had a problem since.

Re: Anyone break the updated non clamshell motor mounts?
 

I originally did a 30 day rebuild on this truck about 8 years ago and went back with these mounts. I was on vacation at the time. Next time I will update to clamshells but that is another few years away when she gets the frame off.

Has anyone else had this happen to this style mount? I have seen some come apart at the end but not actually rip apart like this.

Re: Anyone break the updated non clamshell motor mounts?
 

No one else has a comment on the way these broke? I know that some of you have run these for a long time. It seems like a wierd failure to me.

Re: Anyone break the updated non clamshell motor mounts?
 

It was pretty common on the farm trucks (or race cars) torque seems to tear them up. Probably cheaper build of the replacements don't help either. I have done one set on a daily, but I did tend to repave the road with black strips off the rear tires too. :rolleyes: The last couple folks I know with work trucks took them out and made solid mounts like explained above.

The older 67-72 style mounts were even worse. GM even added a torque cable to keep it from jamming the throttle linkage wide open.

Re: Anyone break the updated non clamshell motor mounts?
 

Thanks palf,
I know of the failure of the original designs and only seen them rip apart at the ends for the redesign. I have also seen the ones with a stud pull out. Just never ones that ripped the steel in two like this. This truck is a high HP toy that is also a work truck around the property. Heck the 4.10s are about to come out for 5.14s. Waiting on the new brake shoes (14 bolt upgrade). Once I am done hauling water to the reclaimed field she goes under the knife. Be detroit rear with a spartan front. Should be a beast then.

Re: Anyone break the updated non clamshell motor mounts?
 

I went old school with mine, chained the motor to the frame.

Re: Anyone break the updated non clamshell motor mounts?
 

Those '63-'72 mounts are just not a good design. They last a little better when you have a manual trans with the crossmember mounted bellhousing. I have heard that the urethane version of those hold up better, but I have no personal experience with them.

Re: Anyone break the updated non clamshell motor mounts?
 

The urathane mounts do hold up good! Ran a set on my 383 (385 hp/440 ft ls), with stick shift. The same mounts are on my 5.3....no bell crossmember, the old longhorn was born with an auto trans:chevy: Longhorn

Re: Anyone break the updated non clamshell motor mounts?
 

Thanks guy's. She has been rolling on a stock replacement that I had laying around. So far so good but will be upgraded next time the truck goes under the knife. She was rebuilt several years as a good looking work truck but will get the full treatment sometime in the future.

Re: Anyone break the updated non clamshell motor mounts?
 

My old 307 had the cables around the exhaust manifolds so when I put the L31 in with headers I just chained the motor down to the frame. Haven't had a problem in 5 years now. Leave a little slack in the chain and you will never know it's there. To me it looks a lot better than the old cable tie downs.

Re: Anyone break the updated non clamshell motor mounts?
 

I have seen and owned a few with chains. I just thought ripping steel apart in the mount was strange and not where you normally see a failure.