4.5" Lift Question
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Senior User
Joined: Jul 2008
Posts: 117
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From: So. Cal
4.5" Lift Question
Guys I installed a 4.5" Icon lift on my 2004 F250 supercab shortbed 5.4. I went with the rear block, which Icon now uses flat blocks. I have a slight vibration at approx. 70-75mph and I am wondering what degree shim I should go with in the rear, or if should I install a 5" spring with the factory block. I would prefer to keep the factory spring.
Thanks for the help
Desert 4x4
Thanks for the help
Desert 4x4
More Turbo
Joined: Jan 2006
Posts: 588
Likes: 34
From: Boston
and in the back (blocks) I opted for 1" more than what came with the kit and my truck has been ok?? not sure if my block was angled or whatnot
Post Fiend
Joined: Dec 2002
Posts: 6,245
Likes: 1
From: IL, USA
Shim the carrier too much and you get high speed vibes.
That's neither here nor there for the original poster as he has a one piece driveline....no carrier bearing.
Icon only makes flat blocks now since the majority of trucks lifted have two piece rear drivelines.
With a 4.5" the 5" flats normally work fine...you may need a 2* shim.
5* tapered blocks may be too much for that height.
That's neither here nor there for the original poster as he has a one piece driveline....no carrier bearing.
Icon only makes flat blocks now since the majority of trucks lifted have two piece rear drivelines.
With a 4.5" the 5" flats normally work fine...you may need a 2* shim.
5* tapered blocks may be too much for that height.
