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Best Automotive Replacement Axle U-Bolt Kits

Square U Bolts 12.5" Extra Long Certified OEM Factory Material Set of 4 Made in USA
These square u bolts are engineered to clamp 2.5 inch wide leaf springs and are 12 inch extra-long measured from the bottom of the bend to the bottom of the threads. Contents: 4 certified carbon steel square leaf spring axle U-bolts with grade 8 hi-nuts and extra thick washers, clear zinc plated rust protection.
Reviews
"I replaced my factory 2003 Z71 leaf springs with 3 leafs, with HD, 5 leaf springs."
"Exactly what I needed, was installing rear add a leafs on my 94 Chevy half ton and I discovered the factory u bolts were nearly worn throug."
"Good quality, only issue is mine were .5" to short from the 12.5" described making them to short for my application."
"I installed a seven-leaf spring set on my GMC Sierra p/u in place of the factory three-leaf springs to boost my trailering capacity."
"Purchased these extended U bolts for my 03 silverado when I added a leaf to the rear spring pack."
"Well they wont work on one inch blocks."
"They are actually thicker than oem and come with Grade 8 hardware."
"At first glance the blocks had a crappy powder coating and the u bolts and nuts had metal chips embedded in the threads that I couldn't even blow out with a compressor. Upon trying to install the blocks and reassemble, I noticed my u bolts were bending outward to the point of not being able to fit into the saddle."
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American Automotive UBLT12-388 Square U Bolts 10" Extra Long Certified Oem Material, Set of 4
These square u bolts are engineered to clamp 2.5 inch wide leaf springs and are 10 inch extra-long measured from the bottom of the bend to the bottom of the threads. Contents: 4 certified carbon steel square leaf spring axle U-bolts with grade 8 hi-nuts and security spring washers.
Reviews
"Fit on a 1990 Chevy truck."
"I only wish I had ordered the 8.5" ones, since I had to assemble and disassemble multiple times to get the pinion angle right, weld perches on, and pull it apart for paint."
"Very well made, Shipped fast."
"Fit my 89 chevy k1500 perfectly!"
"1997 Tahoe 5.7l 4x4."
"These are not as advertised and am really upset."
"Good looking product, shipped reasonably fast but does not fit 3/4 Dodge ram as it says it does, length is correct but width is meant for 1500 leaf springs."
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Rubicon Express RE1225 3.00" x 9" x 1/2" U-Bolt Kit
All U Bolt kits contain 4 bolts w/nuts and washers and are zinc plated for corrosion resistance. Enter your model number to make sure this fits.
Reviews
"They worked out just fine, but they are way long, so after tightening them down I cut off almost 2" off the top."
"Item arrived on time, seems to be good quality - will update later if any issues."
"Just have to cut them to size but were cheaper and easier to find."
"tough and fit as expected."
"98 xj chrslr 8.25 with lift spring pack, works great."
"Just what I needed to install my RE 3.5" leaf springs."
"Needed these when I was swapping my D35 for a 8.25 and installing 3.5" lift leaf springs."
"Works great, make sure you order the right ones for your application."
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Best Automotive Replacement Axle Shafts

USA Standard Gear (SL C8.25-27) Spartan Locker for Chrysler 8.25" differential with 27 spline axles
Designed for off-road usage, this lunchbox locker is easy to install and provides a significant increase in strength over stock differentials. Enter your model number to make sure this fits.
Reviews
"If you decide to go this route it’s a budget locker it works well install is about 3-4 hrs taking your time ."
"Great product shipped amazingly fast."
"The 4cyl version of this I use and works quite well in the front-end."
"Takes a few days to break in; as the first few days the locker would bind up the axle and make a loud pop, but that pretty much went away except for the occasional time I'm turning hard into a parking space or something similar."
"Great locker for the price and self install, you have to know a little what your doing though, I’d say took about 2 hours to install in my jeep TJ Dana 44."
"Increases traction wonderfully."
"Showed up ahead of the scheduled day."
"Clicks and pops louder than I expected."
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Best Automotive Replacement Axle Spindle Nut Retainers

KINGLAKE 240 Pcs Push Retainer Kit,Great Assortment of Push Type Retainers Fits For GM Ford Toyota Honda Chrysler with Plastic Storage Case
1/4" (6.4mm) hole size; panel range: .095"-.540" - Nylon Shield Retainers --Qty: 20. 9/32" (7.1mm) hole size; panel range: .125"-.310" - Nylon Shield Retainers -- Qty: 20. 5/16" (7.8mm) hole size; panel range: .078"-.490" -Black Shield Retainers --Qty: 20. 23/64" (9mm) hole size; panel range: .060"-.510" - Black Shield Retainers --Qty: 20. 3/8" (9.5mm) hole size; panel range: .115"-.565" -Black Shield Retainers --Qty: 20. 25/64" (10mm) hole size; panel range: .040"-.787" -Black Shield Retainers --Qty: 20. Push Type Retainer Kit came with a nice plastic box for easier to pick a type of retainer that you want to use.
Reviews
"-Good for doing small repairs/replacements on various cars. - price is decent for the quality:quantity raito. CONS. - not great for a bigger repair/replacement project due to limit of 20pc each. TL;DR. Great price, solid quality, decent count (20ea),has just about every type of retainer for the common use."
"It’s no longer nuts and bolts when it comes to cars."
"Looks good should have what looks like the most popular fasteners that are used."
"This kit is great to have on hand to replace the pins you lose or break."
"This assortment looks like it has a good selection of retainers, have not used any yet so it is hard to say how they will work but the quality looks very good."
"no fillers only useful parts."
"has every size I need, stay in place when installed."
"Not exactly the highest quality, however there are a lot of them in this kit, and are a fraction of the cost of the "help" area of the auto parts store."
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