RabidStreetRacer

iTrader: (1)

So I posted a thread today about how I broke my driveshaft last night.
From that thread:So i finally have the LS1 broken in and running strong. I took my wife out in it for the first time and did a nice power slide that turned into a 1st and 2nd gear burn out. At about 60mph with the tires still spinning I slammed it into 3rd and the tires decided to grip hard, instant BOOM, smack on the floor board, no power to the wheels, I look back and my driveshaft was about 15 feet in the air
Got towed home last night and will have a machine shop build a much stronger unit this week.

So I just got home and did some measurements for the machine shop to make a new driveshaft. I tried to remove the slip yoke from the trans but it was stuck. It was pretty hard to rotate "yes the trans was in neutral". I could not remove the slip yoke by hand. It took about 5 minutes with a hammer to get it off. Once it got to the last inch, the output shaft was able to move easily like is should. I looked at the splines and at the slip yoke and no damage was noticed on the inside of the yoke or on the trans. I had an old T-56 slip yoke in the garage, I attempted to put that one on and it only went on an inch and met a lot of resistance. I hit it lightly with my hand to see if it would go on with a light tap and it moved like 1mm and became hard to remove and then the output shaft would not rotate easily again. I am thinking something is binding on the slip yoke. Any ideas? Is there something that I can replace that it might be by just removing the tail section, if I am lucky?





Damage to a brand new Belltech Street Performance Shock

jmd

iTrader: (4)

Nice work!

Twisted mainshaft splines are a possbility.

Exidous

iTrader: (11)

Main shaft looks a little bent. Maybe it's just the picture but that will almost certainly need to be replaced. Amazing that driveshaft didn't take anything else out. Looks like a weak spot from the very start. A little strip of metal holding the u-joint together. :-( Definitely failed at the pumpkin first.

hrcslam

When I twisted my driveshaft off it wasn't because of power (I was basically stock at the time), it was because something else was wrong. The previous owner installed the wrong bolts into the bellhousing and they were too long and shanked out leaving about 1/4" of space between the bolt head and bellhousing. So my trans was floating on the bolts to the engine! When the driveshaft twisted, it cracked the bellhousing too. I ended up replacing the TQ arm, DS, rear yoke, and clutch and bellhousing.

If your fwd yoke was that hard to remove, I'd be pulling the tail housing off and looking inside to make sure nothing got damaged. Also, check your bellhousing for cracks too. And, of course, the rear axle.

Here's my thread from when I did it for reference. And when I found out it was caused by the poor clutch install.

blue99fbody

iTrader: (5)

if the splines inside slip yoke are fine then either twisted splines on the mainshaft or u bent the whole shaft with the driveshaft letting go.

RabidStreetRacer

iTrader: (1)

Is there anything that I will be able to inspect by removing the tail shaft that could be the problem?

jmd

iTrader: (4)

You could potentially verify the splines are less than perfectly straight. Or check run-out of the shaft.

RabidStreetRacer

iTrader: (1)

I am thinking there is some type of bearing that is out of the race causing resistance on the slip yoke. It spins freely with no yoke on it, when the yoke is put in at 1" in it meets resistance and then the whole shaft is hard to turn as if something is hitting the outer portion of the slip yoke. I will try to pull the tail housing off later this week and hope for the best.

RabidStreetRacer

iTrader: (1)

After doing a ton of research I believe I found a possible problem. I am thinking the twisting of the driveshaft knocked the tail shaft yoke bushing out of place and causing it to push against the slip yoke. I will be home on Wednesday to remove the rear tail shaft housing and know for sure, but am pretty sure "fingers crossed" that is going to be the problem.

RabidStreetRacer

iTrader: (1)

Got the tail shaft off of the trans. Looks like it is the slip yoke bushing and this rubber washer that is split. I will order a new one and replace it. I tried to put the old slip yoke on the rear shaft and it slid right on with the tail shaft housing off. Great, that means the splines are not warped.

jmd

iTrader: (4)

Sounds and looks like someone new to the T56 did a slip-yoke bushing replacement and hoped for the best. The particular bushing used in yours isn't a best option and when installed in a way that allows for bulging, can lead to a heated and spun bushing. I have several posts on the yoke bushings in the T56. The split rubber seal is for units shipping with fluid and it can be discarded.

RabidStreetRacer

iTrader: (1)

I have done a lot of research and can't seem to find a "best option" for the tailshaft bushing replacement. What do you recommend?

RabidStreetRacer

iTrader: (1)

the tail housing is cracked and was the problem