Your opinions on lower shock mt.

[fuzz]

I'm building a counterfit A roadster pickup. I have seen many T buckets and other rods use a lower rear shock stud to support the rear of the car. This is the first time I've done this and I built my own mount stud using a grade 8 bolt of 1/2 in. diameter. The piece of tube that the bolt goes thru is welded to the bracket. The tube would accept a 9/16 bolt if they made such a thing but I can't find one that size so used the 1/2 in. bolt. Question is, do you guys think it will be strong enough to support the back of the car which shouldn't weigh more than 2500 total when finished?

 

[Sam_Fear]

I have no idea, but I just don't like that. Maybe it's done like that, but seems to me your asking a lot of that bolt. I'd make a U bracket under the bolt so it is double shear.

 

[sgtpontiac]

is that tube/extension welded?

I'm building a counterfit A roadster pickup. I have seen many T buckets and other rods use a lower rear shock stud to support the rear of the car. This is the first time I've done this and I built my own mount stud using a grade 8 bolt of 1/2 in. diameter. The piece of tube that the bolt goes thru is welded to the bracket. The tube would accept a 9/16 bolt if they made such a thing but I can't find one that size so used the 1/2 in. bolt. Question is, do you guys think it will be strong enough to support the back of the car which shouldn't weigh more than 2500 total when finished?

or is it a spacer?? I'd put some sort of gusset top and bottom or as Sam said some sort of U bracing.....it a ton to ask of that bolt alone....JMHO...

 

[Dr Crankenstein]

I agree, double shear is best.

If you must have it this way, I would beef it up as much as possible. Most coilovers have a 5/8'' eye. If that's the case, get a 5/8'' bolt and ream the tube to accept it. Some HEAVY wall pipe with a 5/8'' ID would be better...so the bolt can be held rigid and the pipe can properly support the load.

 

[donsrods]

Fuzz, the guys are right, that one is going to move around on you because the mounting surface is too small. However, there is an easy fix. Speedway makes a mount just for that purpose and I am using a pair of them on the back of my rpu project and we used the same setup on my Son's T bucket. It uses a special 5/8 bolt and is designed to not overly tighten down on the rubber of the coil over. Here it is, part number is 916-36010, and you can get it in plain or polished. You will need a pair of them.

And here they are on the back of my rpu.

Don

 

[fuzz]

Thanks guys. Don..that is the stud we see on most T-buckets and is what I patterned my mount off of but I think mine is too weak. Will get some of those Speedway studs and use them...

 

[Dirtyrat]

All good comments above, if you don't want to purchase anything, you could weld a piece of C-channel to the mount and turn the coilover 90 degrees to put the bolt in shear. If it is a graded bolt, 1/2 is plenty sufficient if mounted correctly. (Single shear is over 17,000 lb on a 1/2" bolt grade 8, but obviously the mount would have to be stronger than that to get to that point)

 

[donsrods]

Today I took this picture of my rpu rear coil over mount. I am using that one from Speedway. Thought this might help you out.

Don

 

[fuzz]

All good comments above, if you don't want to purchase anything, you could weld a piece of C-channel to the mount and turn the coilover 90 degrees to put the bolt in shear. If it is a graded bolt, 1/2 is plenty sufficient if mounted correctly. (Single shear is over 17,000 lb on a 1/2" bolt grade 8, but obviously the mount would have to be stronger than that to get to that point)

I thought the shock eyes should be parallel so it won't bind as the rear twists over bumps and stuff?

 

[fuzz]

Today I took this picture of my rpu rear coil over mount. I am using that one from Speedway. Thought this might help you out.

Don

Thanks for the picture Don. I know there are thousands of rods using these studs without problems, I guess? And it makes a clean installation, but I can't say it looks any stronger than my mess...[P

 

[Dirtyrat]

I thought the shock eyes should be parallel so it won't bind as the rear twists over bumps and stuff?

Hmmm, guess I should have had that coffee before typing that [cl
Turn C-channel 90 degrees to the face, weld, mount coilover eye with through bolt for double shear... my apologies!

 

[donsrods]

Thanks for the picture Don. I know there are thousands of rods using these studs without problems, I guess? And it makes a clean installation, but I can't say it looks any stronger than my mess...[P

It is stronger, and where it has that strength is in the area where the mount sits on the rear end (see red arrrow). It is very wide there and seats firmly on the rear end so it won't rock. Plus, the stud is 5/8 vs 1/2 which in itself gains you a lot of strength.

You will see when you get yours how it is designed and why it is very strong.

Don

 

[fuzz]

Don..makes sense what you said. I will order them and I'm sure now that they will be fine.

 

[fuzz]

Hmmm, guess I should have had that coffee before typing that [cl
Turn C-channel 90 degrees to the face, weld, mount coilover eye with through bolt for double shear... my apologies!

It's cool!!!..

 

[Dirtyrat]

Yep on what Don said, you gain about 10,000 PSI single shear going to 5/8 from 1/2" 17,000 vs 27,000

Those mounts are really nice btw Don.