Crap happens. I think I just got a weak shaft from the factory. There’s many other things that should have broke before this did. I hate that it happened, because I can no longer say I have stock shafts in my trans. I have been these units for far faster cars and one of them was just about as heavy, running mid 9’s and he never broke an output. Everything else except that shaft. Lol. Just my luck.That blows. Good time tho.
I would have broke a manual or the rear end if I had a manual.....a long time ago. This thing has some hard miles on it and wasn’t prepped for a turbo. It was a budget na build....wasn’t planning on a turbo so soon. It’s getting the works this go round tho. I’m trying out a new drum that has 9 full thickness steels and clutches on the 3-4.....and they are turbo 350 frictions which are a good bit wider. I should have no 3-4 slippage problems.There was a post on tech a while back, where a guy broke a shaft or something at the rear which lost all drive...and it too pretty much destroyed the transmission.
And people say auto's are more reliable than manual !! Seems they can be pretty fragile too, even more so with no load against them.
You may want to consider an ATI damper if you don't already have one.Little update. I had the car apart do it got all kinds of love while it was apart. So I mentioned the cam and ls9 head gaskets. I went ahead and changed the flex plate to a heavy duty one which weighs 1lb more. Hope that extra weight stabilizes the idle better. Trying to get it to idle as stable as stock with a touch of lope. Understand that I dropped almost 10lbs if rotating weight when I did the stall. While the flex plate was off I changed the rear gasket and rear main seal. It was leaking. I put my tial wastegate on too. I also hear barrier wrapped my charge pipes. I put led bulbs in my high beams (that’s would a tenth and a mph right there lol). I bell mouthed the turbo side of my inter cooler. It’s reallt thick with a sharp edge so bell mouthing it should smooth air flow out. I also finally added grills inside my sap grill trim. Whew. This was a lot of work I did to the car. I also clearances some areas of concern for things just getting too close. I rebuilt the crossover pipe. I had the v band flange too close to the block and it was impossible to get the clamp on correctly. I now have 9.5lbs of boost with less doing than before AND I added my nifty adjustable doodad to the wastegate so I can turn it up. Should give me another 2-3psi if I need it.
I just went drove it. So far no issues. I’m extremely surprised because anytime you do this amount of work, something happens. So my initial thoughts are.... it drives better, idles a little better, no fuel smell at idle (wife will appreciate that) it still pulls to 7000rpm and it “feels” like it still pulls just as hard, if not, a little better. I have not touched the tune. Oddly it drives almost perfect. Afr is a tad leaner (15.2) and I’m ok with that. My fuel consumption gauge says it’s using .25 gallons per hour less at idle. I’ll fine tune that shortly. Here’s and idle clip.