Ladder bar question

Valair1

Valair1

Valair Inc. Clutch
Joined
Jul 14, 2008
Messages
2,498
As many of you might know i have been breaking alot of trans 4 in six months, do you think it's possible that the solid ladder bar system i got that has no give and could cause me to be breaking the trans, also if your ladder bars are adjustable how do you set your ladder bars, do you preload it and which way. thanks in advance. i set mine to angle the rearend down slightly.
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Mine I can adjust the preload (lazarsmith bars) and I turn them so they lengthen and rotate the pinion angle down. I doubt that it's the solid bars causing your broken trannys cause if that were the case there would be a lot more busted trannys out there. I've got two buddy's running 6 spds (nv5600 (550+hp) and a g56 (900+hp)) with solid bars and the only problems they've had is the nv5600 broke from I think it was a combination of age (200k+) and clutchless shifting and the g56 was from to many WOT runs at 900+ LOL.
 
I dont think its ur bars or lot of us would have busted tranny. My bars are adjustable n i run then unloaded on the street n when go to pull or strip i load them with pinion pointing down.
 
My bars stay loaded 24/7 and have been since I installed them 2 years ago.
 
dang it, everything in the driveline is brand new, i keep breaking these things in hi gear and nailing it. i was hoping to find something, these are getting $$$$
 
I run zero preload on my bars & no troubles here. I was told by alot of different people to run zero preload. I'd imagine that preloading is pushing hard against the tranny when launching. I'm no pro, but just letting you know what I was told. It doesn't hurt to try zero preload for comparison.
 
I adjust my bars to be snug, but not to where they push on the rear end any. No problems so far. I think the more solid you cant get the rear end, the better.

Are you pulling or just driving?

Eric
 
I put about 1/4-1/2 turn preload without any issues. Tell us more about this tranny breaking stuff. What part of the trans, when does it happen, etc.
 
jlibert said:
I put about 1/4-1/2 turn preload without any issues. Tell us more about this tranny breaking stuff. What part of the trans, when does it happen, etc.
Click to expand...

Ditto, also....do you have 2 piece or one piece driveshaft? Have you checked your carrier bearing?
 
Just a thought. Driveshaft is pushing against the trans when the rear end is torqued forward creating enough pressure to bust the case since it a solid piece?? Possibly need a slip yoke shaft?
 
without a pic of your truck here goes

is the truck lifted much?
is the transfercase output and the rear pinion yoke on the same plane
how steep is the driveshaft angle

if you have preloaded the pinion down wards on a lifted truck you are creating such a bind in the universals that when the suspension moves downwards thru its suspension travel your making the angles worse and something has to give, which is usually the universals, but in this case may in fact be the transfercase output because the slip yoke will not be seated deep enough so the yoke can cock in the housing and snap it

measure the driveshaft angle, and also the pinion and transfer yoke angles
then remove the drive shaft yoke and see how deep it actually goes into the transfer case - and als o try to see how far it goes out of the transfer case when the drive shaft moved outweard downward with suspension travel
 
i am breaking these transmissions on the hwy in 5th gear nailing it, i have broke, 5ht gear nut, original trans, updated the main shaft, ripped all the teeth out of the counter shaft gear twice, broke the counter shaft, and 2 teeth out of the big gear on back, i dont know what all i broke this thime, i still have the other gears but it sounds like a bucket of bolts going down the road, i ordered another new trans mission this morning with all upgraded shafts, the truck is not lifted and it has a single pc driveshaft. i have not broken any cases, yet.
 
Just put a stock clutch back in it so it slips every time you nail it in 5th. ;)

I'd vote for the nv5600 swap. Very easy, and several folks have done it. It will be a heck of a lot cheaper than a new 4500 every few months..
 
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