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anyone have problems with 3 inch blocks, vibration at low speeds????

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Old 02-13-2014, 07:45 PM   #1
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Default anyone have problems with 3 inch blocks, vibration at low speeds????

Got my bilstiens and 3 inch blocks installed today. The mechanic at the dealer said i will need to get drive shaft shims to stop the little vibration in the rear. Anyone else have this problem or is the dealer full of crap. only vibrates at slow speeds. Does it need time to settle? only 40 km on them. looks great though.
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Old 02-13-2014, 10:03 PM   #2
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I actually noticed this too, only when stopping at a light or sign. Light vibration from 5mph - 1mph. I don't notice it when driving or under throttle. I actually thought it was my new tires since I did everything at once. I would like to get rid of it though. I have 300 miles on mine and still does it, not sure how it would settle in...
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Old 02-14-2014, 04:00 AM   #3
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Quote:
Originally Posted by clays fx4 View Post
Got my bilstiens and 3 inch blocks installed today. The mechanic at the dealer said i will need to get drive shaft shims to stop the little vibration in the rear. Anyone else have this problem or is the dealer full of crap. only vibrates at slow speeds. Does it need time to settle? only 40 km on them. looks great though.


What lift do you have on the front end? What model truck, supercab supercrew single cab, what motor 4.2 4.6 5.4? And I cut my 4 inch blocks to 3 inch about 7 months ago and I have no vibrations. Now, did you cut yours or did you buy 3 inch blocks and install? If so, what brand? This all comes into play when trying to narrow down a vibration cause. If cut it could be because you cut them level, when in fact they have about a 5 degree angle cut on them and must match that after you cut them. Or could be because the hole you have to drill out wasn't perfectly straight or seated correctly in the block plate pin on your axle. If they were purchased, then start by checking the torque on your U bolt nuts. Torque is 90 ft lbs for a 2003 with 4.6 motor which is a 8.8 inch rear diff. 5.4 motor with 9.75 inch rear diff is same torque. If those are good, then I would check the new blocks to make sure they do have the angle in them. If that's okay, then check to make sure the blocks are facing the right way. Not to sound like a smart a@@ with that, but if the angle is not facing the correct way that can cause axle wrap or vibrations? Who knows. Hope this helped...
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Old 02-14-2014, 11:50 PM   #4
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I got the procomp 3inch block kit. Got them installed at the dealer they are the rite way because the bump stop is in the rite spot. Went back talked with the mechanic today he said that i need the shim kit for the blocks to get the shaft angles rite. And i think hes rite because the blocks didnt have any noticeable slope to them. Went to napa auto parts and what do u know, procomp sells the matching shim kit for these blocks. Why these wouldnt be in the kit is beyond me.
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Old 02-14-2014, 11:54 PM   #5
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Got new tires on today and retorqued the u bolts. No effect. I can c the angles these blocks are putting on the drive shaft . Ordered shims, will b here monday.
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Old 02-15-2014, 08:50 AM   #6
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I have the Procomp blocks too. They never mentioned a shim kit at 4 wheel parts. Would have been nice to do this once.
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Old 02-15-2014, 05:31 PM   #7
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Good to hear clay. So it was the angle in fact? Good stuff. Glad you got it fixed and let us know after you instal the shims how it works!!
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Old 02-16-2014, 01:21 AM   #8
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Mechanic says only 30Min job. Trying to get it in monday rite after i pick up the parts.
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Old 02-16-2014, 06:51 PM   #9
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Hi all. I have the same problem with my 5100 and Readylift 3" blocks. Would the Procomp shim kit work with my setup? I have the same vibration that I notice from 30mph on down. Goes away when the truck is in neutral though.
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Old 02-16-2014, 07:01 PM   #10
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Are they 2.5 degree shims? I have Raptor blocks and have the same vibration and figured I needed shims.
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Old 02-17-2014, 12:36 AM   #11
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They only seem to have 1 shim kit for 09+ f150s, from procomp. They only make 2 block kits for these year trucks, a 1.5 inch and a 3 inch, 1.5 is almost stock height and wouldnt require any shim. The shim is designed to work with the 3 inch kit. It shouldn't matter what brand u have. It wouldnt b the perfect angle for 2.5 inch blocks, but would b better than not having it in my eyes. Just curious, how long have u guys been driving your trucks like this?
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Old 02-17-2014, 07:49 AM   #12
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Got under the truck last night and did a little measuring with the angle finder. Angle at the back of the trans is 5* and at the yoke on the DS is 2.5*, so the 2.5* kit is what I need which I already knew. For those interested I found some SPC brand shims on Amazon for $21 and if you have a prime membership they are prime eligible so you can have them in 2 days.
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Old 02-18-2014, 09:02 AM   #13
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Thanks white out. Do you have 3inch blocks in back? Everyone out here do not order the procomp shims. The picture online of the 52700 kit is rite, but when u recieve it, it will not b correct. That kit is flat shims, not tapered, u can lift your back more but will make ur angles worse. Follow white outs lead, the ones on amazon are the correct ones, if they match the online pic.
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Old 02-18-2014, 02:24 PM   #14
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Quote:
Originally Posted by White-Out View Post
Got under the truck last night and did a little measuring with the angle finder. Angle at the back of the trans is 5* and at the yoke on the DS is 2.5*, so the 2.5* kit is what I need which I already knew. For those interested I found some SPC brand shims on Amazon for $21 and if you have a prime membership they are prime eligible so you can have them in 2 days.
Are these the ones you ordered? Thanks for the help!

Specialty Products Company 10442 2.5" x 5" x 2.5 Aluminum Alloy Shim, (Pack of 6) : Amazon.com : Automotive Specialty Products Company 10442 2.5" x 5" x 2.5 Aluminum Alloy Shim, (Pack of 6) : Amazon.com : Automotive
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Old 02-19-2014, 05:11 AM   #15
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No, these are the Ford specific shims I ordered. They should be here today and if they get here in time I will throw them in after work.

Amazon.com: Specialty Products Company 86255 Pinion Angle Shim for Ford F-150 - Pair: Automotive Amazon.com: Specialty Products Company 86255 Pinion Angle Shim for Ford F-150 - Pair: Automotive

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Old 02-19-2014, 09:56 AM   #16
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No, these are the Ford specific shims I ordered. They should be here today and if they get here in time I will throw them in after work.

Amazon.com: Specialty Products Company 86255 Pinion Angle Shim for Ford F-150 - Pair: Automotive
That looks a lot better, I like that it has hole rather than just a slot to hold it in place. Thanks, let us know if you get them installed how they work out.
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Old 02-19-2014, 10:11 AM   #17
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Would like to know as well if this fixes your vibration issues. Thanks white out.
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Old 02-21-2014, 06:44 PM   #18
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So, I talked to the local shop and they said Pro Comp didnt make a kit for 4x4 F-150... When I get under the truck and measure, I'm almost possitive these blocks are flat without an angle, but 4 Wheel Parts site says it has a taper. I want to see if anyone can confirm if the Pro Comp blocks are tapered or flat before I take them out to see if they're installed backwards or order shims. Thanks
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Old 02-21-2014, 07:37 PM   #19
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Got everything installed today and it seems as though the vibration went away. As far as your Pro Comp blocks being tapered or not its really easy to tell if they are or not. If the block is taller in the rear than it is in the front then its tapered. If not then its not and you probably need shims. If you can't tell then go buy a cheap angle finder and measure the angle of the driveshaft at the back of the trans and the pinion yoke on the differential. They should be complete opposite angles (ie -5* at trans needs to be +5* at pinion yoke.)
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Old 02-23-2014, 06:47 PM   #20
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Any of u guys get a popping sound while in 4x4
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Old 02-23-2014, 06:47 PM
 
 
 
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