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Old 08-11-2009, 08:40 PM   #41
DAZE752
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i had 3" blocks then redriled mine looks good
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Old 08-11-2009, 08:41 PM   #42
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you can do it on any drop. you normally see it on the larger drop because you can only get blocks so big. so its a good way to get the extra inch.

the best reason to do this mod is that you are able to cut the bottom of the leaf mount off. if you lower the truck enough, youll notice that the hanger will like to hit dips, speedbumps, and etc. and the steel there can get thin. ive seen a few trucks that did the redrill because they wore thru the bottom of their hanger.
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Old 08-12-2009, 12:18 AM   #43
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i know i got a lot of questions but, if you would run just 3" leafs and no blocks would you still wanna redrill them? or is this just for blocks? i just wanna make sure when i drop the back i do it right the first time.
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Old 08-12-2009, 01:38 AM   #44
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i aint no pro but wen i was running jus the 3" leafs i didnt redrill cuz it still had alot of clearance. the only reason y i wanted to redrill on my current truck is because there was no clearance underneath the hanger, it was like an inch away from the ground.
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Old 08-12-2009, 04:15 AM   #45
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i have 3" blocks and never have a problem with getting caught up on anything.
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Old 08-13-2009, 12:54 AM   #46
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Quote:
Originally Posted by zman71lsufreak View Post
i know i got a lot of questions but, if you would run just 3" leafs and no blocks would you still wanna redrill them? or is this just for blocks? i just wanna make sure when i drop the back i do it right the first time.
if i were to do a static dropped truck, i would start with the hanger and a block. that can get you 4" easy and itll ride like stock.

like i said, redrilling the hanger is mainly for clearance issues for speed bumps and driveways. it has the added side effect of giving you an inch of drop. you dont have to do it.
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Old 08-13-2009, 02:06 AM   #47
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yep i would redrill if your trying to go more than 3"
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Old 09-02-2009, 07:36 AM   #48
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Tip when re-drilling:

You may need to slot the carrier bearing holes and relocate the carrier so there is no fore/aft loading of the bearing at rest.

Unusual loading of the carrier bearing causes some pretty unpleasant grinding/scraping/groaning noises, more so on cruise than on accel/decel.

Mine was just awful with 3" blocks and a re-drill 2-1/2" up 1/2" back, and the carrier bearing raised 1". I slotted the carrier holes about 1/4" and moved it slightly and it's all good.
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Old 12-24-2009, 03:50 AM   #49
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Just adding this for those searching through info on re-drilling: a 2" redrill will change your pinion angle 2.5 - this may cause some vibration problems - it did for me, I machined a 5 taper on my blocks and all noise and vibration is gone. Who knew.
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Old 12-24-2009, 08:35 AM   #50
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SkinnyG:

What did you do about the locating stud after machining the blocks?
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