Leaf springs U-Bolt recommendations

[tony-muscle]

AMK lists  B @ 3.20 and C @ 5.75

There are 71 - 3 Mustang specific ... 67 - 70 are shorter

Thanks for the answers...is the bolt diameter 7/16"-20 or 1/2"-20?...asking for a friend

So I'll guess they're 7/16"-20 since Don doesn't know...

Yes, my OEM ones are 7/16".

 

[rcadd1ct]

I just did this. If your housing necks down at the bearing it is not a 3” housing. If you have 5 leaf springs the Scott drake ones did not work. I went with 1/2” ones fro summit. Rough country I think. I have to open up the holes in the under mount plate. But like you I figured the 1/2” would be stronger than the 7/16” stockers.

 

[OMS]

AMK lists  B @ 3.20 and C @ 5.75

There are 71 - 3 Mustang specific ... 67 - 70 are shorter

Thanks for the answers...is the bolt diameter 7/16"-20 or 1/2"-20?...asking for a friend

So I'll guess they're 7/16"-20 since Don doesn't know...

Sorry don't read every post on this site / everyday

7/16

 

[EBSTANG]

Thanks for the answers...is the bolt diameter 7/16"-20 or 1/2"-20?...asking for a friend

So I'll guess they're 7/16"-20 since Don doesn't know...

Sorry don't read every post on this site / everyday

7/16

...just teasin' ya Don since you didn't give that dimension's answer in your "AMK lists  B @ 3.20 and C @ 5.75" answer above. I know you know everything...

 

[rcadd1ct]

here is a link

https://www.summitracing.com/tx/parts/tfy-47861/overview/

I drilled out my lower plates to accept the 1/2” bolt

 

[tony-muscle]

I bought the Dayton 351-450 from here: https://www.stengelbros.net/361-450-Round-Bend-12-x-2875-x-6875-Grade-5--U-bolt-Kit_p_376.html

These are 6 7/8 long, 1/2 diameter and with a 2 7/8" bend. They come with nuts and washers. The nuts are longer than standard to help with thread engagement.

The bend I measured on mine was 0.1" more than 2 7/8", but according to the vendor it was within spec. I ended up closing them in the vise slightly until the bolts were spaced to fit in the plate holes. I also drilled the plate to 1/2". Based on my experience, I think the 2 3/4" would have fit well.

I installed mine yesterday and after tightening they hug the differential tightly. You can tighten the 1/2" to 65 ft-lbs per the vendor's spec. The length of the bolt worked well with my 4.5 leaf spring and 4 degree shim plate. I have an about extra 1/2" of threads left at the bottom.

 

[EBSTANG]

I bought the Dayton 351-450 from here: https://www.stengelbros.net/361-450-Round-Bend-12-x-2875-x-6875-Grade-5--U-bolt-Kit_p_376.html

These are 6 7/8 long, 1/2 diameter and with a 2 7/8" bend. They come with nuts and washers. The nuts are longer than standard to help with thread engagement.

The bend I measured on mine was 0.1" more than 2 7/8", but according to the vendor it was within spec. I ended up closing them in the vise slightly until the bolts were spaced to fit in the plate holes. I also drilled the plate to 1/2". Based on my experience, I think the 2 3/4" would have fit well.

I installed mine yesterday and after tightening they hug the differential tightly. You can tighten the 1/2" to 65 ft-lbs per the vendor's spec. The length of the bolt worked well with my 4.5 leaf spring and 4 degree shim plate. I have an about extra 1/2" of threads left at the bottom.

Tony, I'm glad the "Stengelbros" website worked out for you!