View Poll Results: Do you think it is ok to stack leaf spring lift blocks?
Multiple Choice Poll. Voters: 69. You may not vote on this poll
Would you stack leaf spring lift blocks?
Senior User
Joined: Sep 2006
Posts: 208
Likes: 0
From: Las Vegas
When I bought my truck from the ford dealer as a used truck it had stacked blocks in the back. Im dying to get rid of them cuz I can feel the vibration on acceleration and I know it is twisting. Where can I get springs to replace the factory block and lift block? It has the factory 2 inch and an aftermarket 4 inch underneath it with a bump stop pad. Truck is 1999 F-250 ext. cab 4x4 V-10. Thanks
Chris
Chris
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by 993/4ton
When I bought my truck from the ford dealer as a used truck it had stacked blocks in the back. Im dying to get rid of them cuz I can feel the vibration on acceleration and I know it is twisting. Where can I get springs to replace the factory block and lift block? It has the factory 2 inch and an aftermarket 4 inch underneath it with a bump stop pad. Truck is 1999 F-250 ext. cab 4x4 V-10. Thanks
Chris
Chris
Superlift
Skyjacker
etc.
biz
Mountain Pass
Joined: May 2005
Posts: 151
Likes: 1
I don't double stack but there are lift companies out that with their kits which are instructed to double stack on the super dutys because of the variation of no block, 2" or 4" blocks back there (I know pro comp does it this way for sure)
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by sglynx1
Like this??? Bwa hahahaha, guess I'm gonna die soon huh?
Just curious...how did you get the lift up front? Was looking at your gallery pics...but did not see if you went with lift spring packs or hanger system?
biz
Elder User
Joined: May 2006
Posts: 593
Likes: 1
Biz,
Appreciate it, sir! I super-glued them together for good measure so we'll see how things turn out. Nah, j/k.... from the way I understand things, it CAN be a bad thing... if you don't torque the U-bolts correctly.... Those u-bolts are torqued at 200 ft-lbs. per nut, resulting in roughly 800 ft-lbs. of pressure per axle side (1600 ft-lbs. total). This rules out the chances of "throwing" a block. You can hammer on those blocks as hard as you can and they don't move... I forget what the pressure/stress variables are for the rear end specs, but I know that if you don't keep those bolts torqued up you could have problems... basically, just keep em' up to spec and you should be fine. AND... Axle wrap is a concern, but haven't experienced any even and I've hammered on it since I got the lift put on.... The front end is a new 4" spring pack, no hangers. I went block in the rear because as wierd as it sounds it's my preference. I've talked to 2 companies and they both said stacking was not a problem if you kept your torque numbers in check....
Appreciate it, sir! I super-glued them together for good measure so we'll see how things turn out. Nah, j/k.... from the way I understand things, it CAN be a bad thing... if you don't torque the U-bolts correctly.... Those u-bolts are torqued at 200 ft-lbs. per nut, resulting in roughly 800 ft-lbs. of pressure per axle side (1600 ft-lbs. total). This rules out the chances of "throwing" a block. You can hammer on those blocks as hard as you can and they don't move... I forget what the pressure/stress variables are for the rear end specs, but I know that if you don't keep those bolts torqued up you could have problems... basically, just keep em' up to spec and you should be fine. AND... Axle wrap is a concern, but haven't experienced any even and I've hammered on it since I got the lift put on.... The front end is a new 4" spring pack, no hangers. I went block in the rear because as wierd as it sounds it's my preference. I've talked to 2 companies and they both said stacking was not a problem if you kept your torque numbers in check....
Last edited by sglynx1; Jan 24, 2007 at 03:43 PM. Reason: wrong place
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Cross-Country
Joined: Jan 2007
Posts: 70
Likes: 0
From: Latrobe PA
Originally Posted by 993/4ton
When I bought my truck from the ford dealer as a used truck it had stacked blocks in the back. Im dying to get rid of them cuz I can feel the vibration on acceleration and I know it is twisting. Where can I get springs to replace the factory block and lift block? It has the factory 2 inch and an aftermarket 4 inch underneath it with a bump stop pad. Truck is 1999 F-250 ext. cab 4x4 V-10. Thanks
Chris
Chris
Postmaster
Joined: Apr 2004
Posts: 2,654
Likes: 0
From: Bossier City, LA
I don't know why you guys are ragging on Casey so much, after all he is only running a V10, so it is doubtful theres enough power there to wrap the axle up let alone throw a block out. He is also engineer in training, so he knows more than most people. 
Lead Driver
Joined: Jun 2006
Posts: 5,643
Likes: 970
From: Near Yosemite CA
My 2 pennies,,,, if your just driving it, if ya want blocks, use blocks. However, like Casey said, check em, and keep em torqued, blocks got a bad rap when IDIOTS were using them in the front to lift, the dynamics of the front axle are completely different from the rear, the stresses and the like are different. If you are going to be wheelin it, NO BLOCKS. That being said, I have never seen any blocks spit out from the REAR axle, or otherwise come out if new u-bolts were used, AND they were torqued and checked correctly and occasionally, and was being driven on the street without major stress being put on them. (I agree with mrxlh on the V10 torque 
~ ) On my wifes 02 Ex, it has a 1" block along with the stocker, to level it, I check them occasionally, and tow our toyhauler without worry, it doesn't do any serious wheelin other than the occasional snow, or out at Pismo.
~ ) On my wifes 02 Ex, it has a 1" block along with the stocker, to level it, I check them occasionally, and tow our toyhauler without worry, it doesn't do any serious wheelin other than the occasional snow, or out at Pismo.
Cross-Country
Joined: Sep 2004
Posts: 63
Likes: 0
From: langley, british columbia
courtesy of firezapper
aftermarket blocks break. on my f150 i stacked up original factory blocks to get the lift and then got underneath and did a messy job of welding them together. factory ford blocks will never break.
Senior User
Joined: Feb 2007
Posts: 101
Likes: 0
I know it is not anything close to normal operating procedures, but I have my blocks stacked and have had for quite a while. I have the 12.5" suspension lift with appr. 35k miles and no damage done yet. I put my truck through some vigorous terrain quite often and no axle, driveshaft, u-joint, or rearend damage has occurred yet. I am probably the one you will be laughing at on this forum if everyone is in agreement and I'm not the norm. I have no problems with the vehicle shaking or feeling out of balance either. My truck apparently is the abnormal one here. I take it offroad and am not afraid of taking it to extremes. My own experience is that even though it is not supposed to done, doesn't mean it can't be.
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