rear block help??!! - Ford Powerstroke Diesel Forum
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Old 10-18-2007, 05:20 PM
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rear block help??!!

i finished my lift...finally. up front i have a trailmaster 3"shacle kit with an addaleaf for a total of around 5inches i have a drop pitman arm for a 4"lift along with a track bar bracket for a 4"lift. In the back which is were my question is i replaced the factory block with one 5inch block. what i am worried about it the angle of the rear axle now because the block i put in from superlift is not wedge shaped to kick the axle toward the transfer case. i asked superlift about this and he said it was fine you didnt want to axle pitched to much but everyone else tells me the opposite you want it kicked up to reduce strain on your drive shaft universals. anyone know anything about this or have a similiar set up or just a comment feel free. thanks.
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Old 10-18-2007, 05:29 PM
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in theory.... you want the driveshaft u-joints to do as little work as possible. you want the output shaft of the transfer case to line up with the rear pinion yoke, but with a lift thats impossible, so you have to compromise and either drop the transfer case so the angle is not so great, or deal with the vibration and wear and tear on the u-joints. The more direct the driveline the better.
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Old 10-19-2007, 05:49 PM
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yeah i talked to the guy at superlift and he tried to tell me that the block not being wedge shaped was better but i dont think i believe him. how hard is it to lower the transfer case? i guess it should be ok i know alot of kit at a 4 or 6 inch block on top of the factory block so my single 5" block should be ok, i just wish it was not flat thats what has me worried.
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Old 10-20-2007, 06:58 AM
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I'm running 6" of lift in the rear and i have not touched the T-Case to drop it. On the other hand, I have a shorter wheel base than many, I have a reg. cab 8' bed. My buddy Dennis has a Crew cab (4 door) 8' bed dually with a 6.5" lift in it and he had to drop his T-case bracked a little bit so his u-joints wouldnt vibrated and bind, not that its dropped it mad all the difference, the driveshaft is happy.
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Old 10-20-2007, 08:53 AM
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do you have a 1 piece driveshaft or 2? you could always get a carrier bearing drop
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Old 10-20-2007, 11:00 AM
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mine is one piece. how hard is it to drop the transfer case? if it doesnt vibrate is it ok?
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Old 10-20-2007, 11:09 AM
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Quote:
Originally Posted by powerstrokin87 View Post
mine is one piece. how hard is it to drop the transfer case? if it doesnt vibrate is it ok?
As long as you have zero vibration you will be fine. If you have any vibration from 0- highway cruising speeds that is not caused by your tires or that you didn't have before you lifted the truck. Then you will have to correct your driveshaft angle. The easiest way is to correct the axle pinion pitch to the transfercase.

Usually with any large size lift you have to do this. It just depends on how much correcting you need to do. To remove the driveshaft vibration.
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