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TTB's have phenomenal shock absorbtion capabilities, in other words they ride like a dream, and absorb stuff like washboard like it isnt even there....
They dont handle large tires and lift very well, but for a moderately sized rig, Im a big fan.
i have put mine through some beating, and i hardly feel it in the front end. i feel more of the beating from the rear-end. it does work really well if you dont run a tire bigger than a 33, i would advise. the only thing i never liked about them is the fact that the axle shaft was exposed. i never liked that, but other than that, i dont have a problem with them.
The solid axle Dana 44 is hands down going to be stronger...less parts to break! I am running 33 inch mudders on my 84 F150 4wd with TTB, I have not broken anything...yet anyway. I have run some pretty deep mud bogs, a lot of dune and trail riding, and it has held up very well. More than a few times pulled stuck or broken down vehicles out of some nasty places. I set my rig up to handle this kind of use, 4.10 gears, Trac Lok LS in the front, Powertrax locker in the rear, 2.5" suspension lift, and 33x12.50 Mud King tires. It works like a tractor, I just drop it into low range/granny (or what ever gear combination I feel is needed) and start pullin. The way it's set up I don't have to beat on er as hard to get the job done. I have concidered and may still do a straight axle conversion to my truck if and when the TTB wears out. I like the TTB because it has a nice ride and tons of suspension travel, it works really well on uneven terrain. Just my 2 cents!
Like most have said, with moderately sized tires, TTBs work well, and are durable. The original Green Submarine spent its entire life getting flogged to hell and back in the Florida swamps. With a 50 TTB and 35" Ground Hawgs, I didn't break much more than hubs and ujoints with an LS and a 300. After I swapped to a built 400, more stuff broke. I built a 429 then a 460 and really started breaking stubs. About half the time they broke at the ears, and the other half they broke off at the lockout hub. I broke a trac-loc case once, gutting the entire diff. Shock loading parts with big tires (high rotational forces) and wheel speed (increases rotational forces) is damaging to any axle, not just a TTB. This was before the advent of cro-mo axles and long before I settled down to being somewhat sane.
I assume you are talking about extended radius arms, correct? If so you are in luck there are several companies that offer extended radius arms with their lift kits: Trail Master, Skyjacker, Super Lift, and I believe Black Diamond (BDS). I personally recommend you check out Jeff's Bronco Graveyard website (www.broncograveyard.com), they have a huge selection of lift kits, traction bars, drivetrain parts, body parts, you name it they have it. If they don't have it in stock they will go out of their way to get it for you. I personally have had great experiences doing business with Jeff's, they have reasonable prices and their service is outstanding. Hope this helps, good luck and have fun with it!!
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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