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well being a TTB setup tru flex is difficult to achieve. some have used a pair of Deaver front coils to soften things up in turn make sure the shocks arent holding you back to much yet still provide proper support.
I figured I wasn't going to get much flex out of it due to having stock springs with twist in coil bosters to get it up an inch and a half . the coil sprung dana 44 axels around here go for around 1000 for the axel with the radius arms still attached to it and in good shape.
In stock configuration the TTB only gets about 11" of articulation and that's pushing it from stasis to full compression and expansion. Lifted, with longer radius arms and drop brackets you can get closer to 15" of articulation. If money is no object, check out the Autofab website. They will lengthen and re-shape the axle halves in your TTB setup to achieve 22" or more.
what part of the country you live? 78/79 D44's run about $150-300 around here. just understand that to get those in your still gonna spend another grand in hardware.
A ttb can flex pretty well with some work put in to it. A buddy I know runs a 6 inch ttb lift and can flex with the best of em.
I need to put some shocks for a 6 inch lift in mine but here's my flex
This is my bronco just for ****s and giggles I put a jack under her and lifted up jack maxed out before my tire came off the ground.
Here is the rear
All the front has is shocks for a 4 inch lift and 5.5 Deaver super flex coils from JFB.com
I don't have any good pictures from up front, but here's a picture anyway
Pro Comp 6 inch lift with extended radius arms up front and it's an add a leaf set up in the rear. Absolutely love how it performs offroad. I think it could flex more if the front springs weren't so stiff, though.
When I get the money I'm planing on doing a 6 inch lift with extended radius arms. I noticed today that my drivers side is being limited on compression by hitting the bump stop.
When you start researching lifts, do yourself a favor and check Tuff Country's products. They are the ONLY manufacturer that I know of who build in additional alignment capacity to their lifts. And all you need to do is ask someone who has lifted a TTB-equipped truck... having any additional alignment capacity is a very good thing. Just something to keep in mind.
One thing I would like to point out. If you want more flex because it looks cool, go for it. But if you want more flex for better off road ability, the first thing too spend money on is lockers. They make more difference then flex or tires. I'm not suggesting that flex doesn't make a differnce, just that not as much as lockers.
My truck currently has the trac-loc rear end in it and a open front. But now I just realized the other day that my rear pinion bearing is shot. Now I gess the lift is going to be side lined wile I fix the axle. Good time to change up to 3.73 or possibly 4.10 gears and maybe a locker in the rear and possibly a posi in front. Do you guys think that the front axle in stock form can handle a posi???