Hello,

I have adjustable front spring mounts that use the 5/8" spring eye bolt. The springs are Mopar Performance 1-1/2" spring eye size. I just bought the P-S-T polygraphite spring eye bushings for the 1-1/2" spring eye. However, the bushing shell where the spring eye bolt passes through the spring eye bushing is 1/2", not 5/8".

I will call P-S-T on Monday to see if they have bushings that can accommodate the 5/8" spring eye bolt diameter.

If they don't, now what do I do? I guess my only option is to bring the springs to a locale spring shop and have them install custom bushings (probably rubber junk) that accommodate the 5/8" spring eye bolt.

Any other options? I really doubt I'm the first to come across this dilemma

If you are comfortable with the 1/2 inch bolt, anyone with a lathe and any skill can easily make some adapter washers. I would be happy to make them for you if you need me to. Just PM me.

Are the walls of the 1/2" PST sleeves thick enough to allow being drilled out to 5/8"? (That will leave the walls only 1 /16" thinner than they are now.) Might need a machine shop, especially if the sleeves are hardened.

FWIW, I also like to put the bolts in with anti-seize in the sleeve.

I am having trouble visualizing adapter washers. Can you please provide a picture to help me?

The issue is with the size of the sleeve that goes through the polygraphite spring eye bushings. The sleeve that comes with the kit (at least for a '68 Barracuda) accommodates a 1/2" bolt. I guess A-bodies came with 1/2" spring eye bolts. I am thinking about getting sleeves that accommodate the 5/8" diameter bolt that my car now has and then drilling out the polygraphite spring eye bushings to accommodate the 5/8" sleeve. I'm not going to do anything until I talk to PST on Monday. Just trying to figure out what my options are.

I wasn't going to drill out the sleeve; too thin as you suggested.

Good idea on the bolts going through the sleeve. My Jeep had the driver's side bolt rust (weld) to the sleeve and the spring had to be cut apart to get the bolt out.

This would be an example. The washer fits in the 5/8" hole and properly locates the 1/2" bolt.

Mark, yes, that would probably fix the issue. I don't have much clearance between the spring eye bolt head and the frame rail. So the "boss" of the washer might push the head of the bolt too far out and then it would interfere with the frame rail. I would be willing to try it anyway.

Let me call PST on Monday and see what they can do for me.

Thank you for drawing up the diagram, I appreciate it

I'm not convinced they are too thin. They only press against a relatively soft material by whatever force the the thru bolts applies. If the thru bolt has sloppy fit, they may hammer the the sleeve, if tight, not sure it would matter. Factory design was for maybe 100K? trouble free miles, your likely use is? Difficulty in enlarging to 1/16" wall would be be biggest hurdle IMO.

edit, upon further reflection, if the 5/8" thru bolt is max tightened, I suspect distorting the 1/16" thick bushing is likely, and would quickly promote its failure, so maybe I am now convinced?

is there enough room on your bracket to drill a 1/2" hole above, or below, the original 5/8" hole without having the spring itself rub the floor pan ? if you need [or want to] to relocate/center the rear tires in the 1/4 openings, this may be the time to drill the holes you need to do so in the brackets. you could possibly gain up to 1/2" or so.
you may, however, need to get a longer driveshaft doing this.
just a couple of suggestions that may work for Your Application. the quality back in the day was all over the place.

What size spring eye bolt comes on a b body? Is it 1/2" or 5/8"?

How much different is the width of an a-body leaf spring vs b-body leaf spring? I'm wondering if b-body sting eye bushings would work with an a-body that has the 5/8" spring eye bolt

Edit: I called Mancini and they advised I use the front spring eye bushings for an E-body. The E-bodies use the 5/8" spring eye bolt. I believe all Mopar passenger car leaf springs are the same width (2.5"). However, even the E-bodies used different spring eye diameters: 2" on small blocks and 1.5" on big blocks. So, I'll try spring eye bushings for a big block 1970 Barracuda and see how that goes.

Front spring eye bolt is 5/8", don't change it, Chrysler had a reason, trust them. Get the correct bushings. New rubber works great, lasts a long time. Eaton spring has them in Detroit. At my shop we consistently find aftermarket bushings with oblong holes and suspension bolts wobbling around in them! These parts were originally designed for race cars that get rebuilt every season. I'm sure somebody will [censored] at me about this but its what I see Every week at my shop. We work on muscle cars classics and hot rods. Mostly Resto Mods. I only use urethane when nothing else is available.

I don't think a-bodies came with a 5/8" spring eye bolt. I believe they originally came with 1/2" spring eye bolt (barring any QA issues at the factory). My 68 Barracuda has the aftermarket spring eye hangers, which use a 5/8" spring eye bolt.

To remedy the situation, I had to buy 1970 E-body spring eye bushings from P-S-T for a big-block. They use the 1-1/2" spring eye size and the 5/8" spring eye bolt. The small block 1970 E-body bushings on the other hand use the 2" spring eye size and the 1/2" spring eye bolt.

I guess Chrysler went with the bigger spring eye bolt for big blocks due to the torque they make.

My cars all have 5/8 bolt from the factory- 68 slant six Dart, 68 Hemi Roadrunner and 72 340 Cuda.
Just put front eye bushings in a 69 340 Cuda and a 70 charger, all have 5/8 bolt as well.