Spring perch pics

[JDMopar]

@Dana67Dart Here is a pic you requested in another thread the other day. Center hole in the new MP spring perches measures 11/16. Hole in the originals measures 33/64, and the center stud of some E body springs I have laying around has an OD of 1/2”. Hope this helps. You need to make some bushings to weld into new perches before welding them to a housing.

 

[65 Cuda 340]

Correct me if my math skills are completely gone, but I think your numbers are incorrect. ??

 

[JDMopar]

Just posting what my ultra high dollar Harbor Freight digital calipers said. Dana asked for a pic of the new ones vs old, and there it is. The hole in the old one still on the housing may be out of whack. Holes in both old perches are wallowed out and the one above is the best one. I plan on having bushings made that will have a tight fit into the center hole of the new perches, and then bore the hole for the spring center pin to fit whatever size the pin is in the springs I get from ESPO for my car. Everyone needs to fit theirs to their own situation.

 

[Icetech]

Moroso perches are 1/2" (or at least fit the 1/2" spring pin properly) and $25 a pair...

 

[JDMopar]

Moroso perches are 1/2" and $25 a pair...

Are they curved up at the ends like the factory ones? Wouldn't matter in my putt around 65 Barracuda, but if you put perches without the ends being somewhat boxed by the curved up ends, a high HP car will wad them up in short order.

 

[Icetech]

Are they curved up at the ends like the factory ones? Wouldn't matter in my putt around 65 Barracuda, but if you put perches without the ends being somewhat boxed by the curved up ends, a high HP car will wad them up in short order.

yup... i have installed 2 sets in the last month cause i messed up the pinion angle the first time..

Oh.. sorry they are $36 on amazon...

Moroso 85090 3" Tube Spring Perch, Steel​

 

[JDMopar]

Those would work good, and save fiddling with making bushings.

 

[65 Cuda 340]

Just posting what my ultra high dollar Harbor Freight digital calipers said. Dana asked for a pic of the new ones vs old, and there it is. The hole in the old one still on the housing may be out of whack. Holes in both old perches are wallowed out and the one above is the best one. I plan on having bushings made that will have a tight fit into the center hole of the new perches, and then bore the hole for the spring center pin to fit whatever size the pin is in the springs I get from ESPO for my car. Everyone needs to fit theirs to their own situation.

OK, I don't want to beat this to death, but 11/16 would be 44/64. That's more than three times larger than 13/64. The holes in the new MP perches are clearly larger than the originals, but they don't look any where near three times as large.

By the way, I found a piece of tubing I had sitting around that was the right inside and outside diameter to fit snugly in the MP spring perch and snugly over the spring pin.

 

[65 Cuda 340]

Having said that, since I have not welded the MP brackets to the axle yet, I think I will order a pair of the Morosos from Amazon. Probably a stronger setup to have a correct size hole than the cheap bushing I've got now.

https://www.amazon.com/Moroso-85090-Tube-Spring-Perch/dp/B000CON4R0/?tag=fabo03-20

 

[JDMopar]

 

[JDMopar]

I like the Moroso ones after looking at them when @Icetech mentioned them a bit ago. If I were putting them in something besides a run of the mill street car, I would fix the ends to mimic the MP ones so they would be less prone to

break.

 

[65 Cuda 340]

View attachment 1716257904

I agree with that measurement. It's the 13/64 you have for the hole in the original spring perch. I measured one at .506 - barely over half an inch, or 8.1 sixteenths. I.e., just over 32/64.

 

[65 Cuda 340]

And I apologize for having to edit the above post after getting the numbers switched. But I think I'm right now.

The holes in the MP perches are almost a quarter inch larger than the holes in the original perches.

 

[JDMopar]

I said the originals measured 13/64, if you look at the first post again. It's barely big enough for a 1/2" drill bit to fit the hole on the original that is still on the housing....but wallowed out from too many years of side stepping the clutch. The perches are on an A body 8 3/4 housing I bought at a swap meet a few years ago for $25.

 

[Dartsun]

I agree with that measurement. It's the 13/64 you have for the hole in the original spring perch. I measured one at .506 - barely over half an inch, or 8.1 sixteenths. I.e., just over 32/64.

I saw that also. Was thinking that hole isn’t 4x size of the other one.

 

[JDMopar]

Y'all are exactly right!! I was trying to keep too many numbers in my head and posted the wrong one for the originals, which I will go back and edit now. I went out and measured the original again and it is 33/64. That's the half way good one....the other one is toast! Sorry for the mix up.

 

[JDMopar]

I said the originals measured 13/64, if you look at the first post again. It's barely big enough for a 1/2" drill bit to fit the hole on the original that is still on the housing....but wallowed out from too many years of side stepping the clutch. The perches are on an A body 8 3/4 housing I bought at a swap meet a few years ago for $25.

Edit for correction. The original perches still on the housing measure 33/64 in the center hole, NOT 13/64 as I originally stated. I was trying to keep too many numbers in my head to get back to the house from the garage, so I could post easier on the laptop instead of my phone.

 

[65 Cuda 340]

Y'all are exactly right!! I was trying to keep too many numbers in my head and posted the wrong one for the originals, which I will go back and edit now. I went out and measured the original again and it is 33/64. That's the half way good one....the other one is toast! Sorry for the mix up.

No problem. I had my own mixup and initially posted the wrong number (my post #12) trying to respond to your post. Which you responded to before I could edit the post.

Anyway, thanks for measuring. Plus, now I know about the Moroso perches. Didn't know that before.

 

[Icetech]

I will say.. which every way you go.. use a torque wrench.. the difference from me just making them tight and doling it proper was night and day.. i know i spent 40 years doing it wrong and could have had a much better ride

 

[Dana67Dart]

@Dana67Dart Here is a pic you requested in another thread the other day

Thanks.

I have found that most OEM 8 3/4 perches center holes are messed up.

For me it was 4 out of 4

 

[RustyRatRod]

The holes in the MP perches are bigger, because MP also used to sell leaf spring bolts with a bigger "pin" that fit the perches. I guess they somehow thought the bigger pin would give more holding power somehow, but the bolst themselves were the same size. lol