Rear block question....need help PLEASE...
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Cargo Master
Joined: Feb 2005
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Rear block question....need help PLEASE...
I am looking for some 4" rear blocks to complement the 2.5" leveling kit I am putting on the F250 in my signature.... do I need tapered or flat blocks for this? Thanks.
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Cargo Master
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Well, I ended up calling my local truck accessory shop who does lifts and they had just put a lift on an F350 CC and had the stock blocks and U-Bolts waiting to be thrown out, so I ran by on my way home from work yesterday and picked them up. I am pretty happy to have gotten them for nothing, hopefully before too long I will have up some pics of my truck with the leveling kit complete.
Cargo Master
Joined: Nov 2004
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From: Friendswood, Texas
Originally Posted by cleatus12r
Words to live by:
Get new u-bolts.
Cody
Get new u-bolts.
Cody
Thanks,
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Cargo Master
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Yeah, expand please on why not to use the old u-bolts. I'm not trying to disagree with you, but we're talking money here and I need a little more info than just "words to live by." Thanks,
Bob
Bob
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From: TX
I've heard it's because they have already been torqued and stretched. Way to much of an important part to go used on. Others may have better info.
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Butt-Head
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From: Reed Point, MT
Originally Posted by Robert
expand please on why not to use the old u-bolts. I'm not trying to disagree with you, but we're talking money here and I need a little more info than just "words to live by."
Originally Posted by texan
Pardon my ignorance - but why is it not OK to use the old ones?? I suspect the originals will be a tad too short. Is there another reason??
U-bolts are no exception. Once they pass their 'yield' length, they begin to stretch and lose their tensile strength and do not return to their original length. In other words, once they've been torqued and loosened, they will not hold the proper torque again. And don't over-tighten them. Max. torque on a leaf spring u-bolt (9/16) is 150 ft. lbs.
Cody
Last edited by cleatus12r; Dec 8, 2005 at 01:25 PM.
Cargo Master
Joined: Nov 2004
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From: Friendswood, Texas
OK - they're torque to yield bolts. Didn't know. It's not the case with all fastners as was stated above, unless of course, they are torqued to yield strength or beyond.
Cheapo's - they could have gone up a bolt diameter and avoided this nasty little quirk.
Cheapo's - they could have gone up a bolt diameter and avoided this nasty little quirk.
Butt-Head
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From: Reed Point, MT
Oh, I din't mean that they were an actual "torque to yield" bolt. However, every bolt does stretch; i.e. connecting rod bolts, lug studs, etc. That's why we use torque specs on crucial fasteners. It is figured in to keep the bolt's elasticity without stretching the bolt.
Just replace the u-bolts. It's good practice.
Cody
Just replace the u-bolts. It's good practice.
Cody
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well I don't follow cause you take your tires and wheels off a vehicle a ton over the course of its life and you don't replace the lugs or studs unless they go bad for some reason. and they are torqued each and every time at least if you go to a reputable place or use a torque wrench yourself. so I'm not sure why a u bolt would go back after one application.
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