I recently put the trans in and the driveshaft slid onto the tail shaft easily. Since then I broke an axle at the track and finally got around to pulling the rear end out. After I unbolted the driveshaft from the rear end, it would not slide into the trans easily. I was able to get it in far enough to get the rear end out, but now I cant get the driveshaft out of the trans. Anyone ever see this before? Twisted splines on the driveshaft? Broken tailshaft? I guess I wont know until I pull it off?
Driveshaft will not come off tailshaft after breaking axle on launch
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That isnt the first time i have heard of that happening. A local friend had the same identical thing happen to a Mustang that broke the rear on launch. Difference was he didnt try to pull the trans out. He fixed the rear and continued driving it. Problem was it rode extremelt STIFF. When they finally pulled the trans out, the splines had twisted and the yoke was stuck on the output shaft.
steve hughes
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I have had this happen on my car several times. The splines in the trans yoke twist after lots of hard launches.
Well we got it out. Had to hit it with the air hammer! The splines in the driveshaft yoke were twisted as you can see in the pic:
http://a5.cpimg.com/image/49/5D/45682505-71e6-0200019D-.jpg
http://a5.cpimg.com/image/49/5D/45682505-71e6-0200019D-.jpg
BobbyBuick
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Steves looked like a candy cane .After some of those tranny brake launches
Almost makes you wonder if that might be part of the trust bearing issues.
Oh wait, I'm repeating myself.
Does anyone use any real *high pressure* grease on the splines, when installing a driveshaft in an application where there's alot of power braking?.
Hmm, maybe it's time for some real Launch Assist code?. ie dropping fuel rather then ignition. FWIW, with SEFI and you do fuel drops, it ain't making things lean, there's just not enough fuel to support combustion. Just use the brake light power, as the control mechanism, then a couple enables for TPS, and RPM.
But, I don't run 9s, so feel free to ignore those comments.
Oh wait, I'm repeating myself.
Does anyone use any real *high pressure* grease on the splines, when installing a driveshaft in an application where there's alot of power braking?.
Hmm, maybe it's time for some real Launch Assist code?. ie dropping fuel rather then ignition. FWIW, with SEFI and you do fuel drops, it ain't making things lean, there's just not enough fuel to support combustion. Just use the brake light power, as the control mechanism, then a couple enables for TPS, and RPM.
But, I don't run 9s, so feel free to ignore those comments.
The problem is partially the stock yoke. One you fix that, the driveshaft is the next weak link. Spend the money and get an aluminum shaft to absorb some of the shock. Trust me, I have seen the 27 spline output shafts twist on 2004r's, th350's and powerglides.
My car went 11.40 this year, not 9's. It has only been in the 1.5's 4 times. Your post about launch assist doesnt make sense to me either, considering I run a BS3. I did not use any grease on the yoke. And I dont see how this could be related to thrust failure.
Care to elaborate your post a little further? It was greek to me.
When you bind up the splines, then as the U-Joint angles change (which changes the driveshaft's effective lenght), something has to move. *Normally the rear of the trany rises slightly as well as the nose of the rear axle rising, this is going to cause the pinion to be pressed rearward, or yoke forward.
Launch Assist, as I was explaining was about dropping cylinders, fuel wise. There are other versions *Lanuch Assist*, some just retard the timing to try and cause afterburning in the exhaust, some drop ignition events, etc, etc..
Intercooler
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I had the same thing happen to mine going 11.4 with a 1.5 60'. Only way we found it was the driveshaft was a bitch to get in and out. Just wouldn't slide up far enough. Closer inspection showed twisted splines just like you have in your picture. We put a new yoke on but it is a stock piece. If it does it again (car is faster now and transbraked) then I may be getting a new driveshaft or heavy duty yoke.
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