New U-Bolts
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Cross-Country
Joined: Dec 2021
Posts: 99
Likes: 32
New U-Bolts
I am getting ready to finally install my DJM lowering kit and flip kit for the rear. My U-bolts dont look the greatest and plan on replacing them when I go to install. Anyone know the diameter needed? Or a good place to buy?
FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
You best bet would be to take an old one to a local spring shop and have them make up new ones.
Also if you Google Spring U bolts I am sure something would come up also.
https://www.google.com/search?q=leaf...hrome&ie=UTF-8
Dave ----
Also if you Google Spring U bolts I am sure something would come up also.
https://www.google.com/search?q=leaf...hrome&ie=UTF-8
Dave ----
More Turbo
Joined: Dec 2021
Posts: 554
Likes: 186
. u. g them made locally has always been a bit cheaper for me, plus I could get extras like double washers and such as needed. These being just round U-bolts any online vendor of Dayton parts will have them as well, if you can't find a local big truck shop or just don't have the time to drive around.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,844
Likes: 129
From: Atlantic Canada
F150 U-bolts should be 9/16" I believe. 9" rear diff has 3" OD axle tubes, and 8.8 has 3.25" OD axle tubes. Spring shop will know...they have all this info in their catalogs.
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
Rockauto supply Husky Spring u-bolts (per model/year); I'm ordering a set now for a rear axle swap.
Laughing Gas
Joined: Feb 2016
Posts: 817
Likes: 27
I have an 80 Bronco with a 9” rear. The u-bolts are M14x2.0. So are both rear bolts. Front bolt is M16x2.0.
A 13 tpi gauge fits very well and could cause some confusion. 13 tpi is 1.95mm/thread. Mine measured around 0.540” and are definitely 2.0 mm/thread.
A 13 tpi gauge fits very well and could cause some confusion. 13 tpi is 1.95mm/thread. Mine measured around 0.540” and are definitely 2.0 mm/thread.
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Moderator
Joined: Jan 2001
Posts: 56,977
Likes: 2,733
From: Virginia
That make sense they are metric. The bolts that hold the bed down are metric as well as most everything else on the truck except the old school engine blocks, transmissions and rearends like the 9 inch.
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More Turbo
Joined: Dec 2021
Posts: 554
Likes: 186
The more readily available equivalent to M14 would be a 9/16 U-bolt. These have fine-pitch thread so can produce more clamping force cause they can handle more torque at the nuts. They're also usually found in grade 8 steel, which is comparable to the 10.9 class Ford usually uses for their more vital hardware.
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