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Leaf springs U-Bolt recommendations
#21
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.
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#22
(02-18-2019, 02:41 PM)EBSTANG Wrote:
(02-15-2019, 04:14 PM)EBSTANG Wrote:
(02-15-2019, 08:55 AM)OMS Wrote: 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
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#23
(03-04-2019, 08:43 AM)OMS Wrote:
(02-18-2019, 02:41 PM)EBSTANG Wrote:
(02-15-2019, 04:14 PM)EBSTANG Wrote: 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... Wink

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! thumb

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#24
here is a link

https://www.summitracing.com/tx/parts/tf.../overview/

I drilled out my lower plates to accept the 1/2” bolt
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#25
I bought the Dayton 351-450 from here: https://www.stengelbros.net/361-450-Roun...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.

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
4-wheel disc brakes
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#26
(03-05-2019, 11:20 AM)tony-muscle Wrote: I bought the Dayton 351-450 from here: https://www.stengelbros.net/361-450-Roun...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!

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! thumb

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