As some of you know I had a input shaft snap on me. I was running a Spec 3+. I don't do hard launches ( i hate to sqeal tires on the line) i just like to bang thro the gears. The shaft snapped during a 3-4 shift was this a 1 in a million happening? Does this happen alot with the SPEC 3+? I got a new shaft and i'll install it tom. What i'm asking is, if I use the Spec again will i have another broken shaft on my hands? Or should I buy a not so agressive clutch, if so what do you all suggest?
Thx Ken

 

Power shifts between gears is everybit as hard on transmission parts as is doing burnouts or hard launches ... maybe even worse.

It would be interesting to see were it snapped. It could have been caused by a stress riser as a result of bad design or workmanship of the part. Stress risers cause fatigue cracks under high loads. Good machining practices (minimize sharp corners and transitions) minimize the effects of stress risers. After that it is post manufacturing treatments like shot peenng the critical areas. In the end, a trans designed for 300 ft-lbs torque will run a lot longer at 300 ft-lbs than one subjected to 400 ft-lbs.

A beefier clutch will get you to failure sooner.

Maybe you just need a GT500 transmission set up. Believe its bit beefier than ours.

 

+1. In fact, once you are spinning tires, I believe the only thing you are putting stress on is the tires themselves (assuming you're not over-revving the engine).

 

Just an effect of your extra power and the stress of hard shifting.

 

What type of clutch should one use for a stock GT once the stock clutch burns up?

 

Another stock one if you like it.

 

Like bullitt995 indicates same one or specification. If you are temped to get a killer one, pedal effort will go up, and then other things start to wear out, even though its a hyd set up. The GT500 I hear is a dual disk. With a multi disk set up, you don't need more clutch disk pressure. You have doubled the clutch plate capacity (but not the transmission) by doubling the area.