alan threw mine doing a third gear pull at 140mph. it was supose to hold 800hp he said, what happens is it has to much rotating mass at high rpms and it starts to jump rope, thens it all over with. i now have a 4" aluminum and so far so good. sorry to hear you lost your tranny! good luck!

 

I know what caused my jump roping driveshaft. I just calculated my mph since I hit the rev limiter @6500 in 4th gear(1:1 ratio). 163mph The driveshaft was spinning 6500 as well.
There was a GSXR600 in my rearview.

 

Hey cracker why didnt you call me? Soounds like fun. Thats funny that I talked to you just moments before this "incedent" happened

 

Sorry man. Been busy with fathers day and such.

 

Upgrade to the Viper 30 spline output shaft and yoke! You're going to need it.

 

yeah, seriously considering it. Definately going to get a heavy duty shaft from Dennys driveshaft.

 

Hey mj, I was going to sell o1slow my Inland Empire shaft, heavy duty aluminum. Barely used, comes with transfer case output. I also have a nice steel one. I don't remember the measurements, they are custom due to the 80e install, but if you are interested, I can hook ya up. Ooooh, I just thought of a good barter trade, i Know what you have (or could have) that I'll take. PM me if your interested. BTW, I have saved your pics from this thread for future videos if you don't mind.

 

A buddy of mine just got his regular cab with 6 speed conversion and broke two driveshafts last week. Both on the test drives. The second one though broke the trans in 3 places. His broke at around 6k or so in 4th gear.

 

That sucks. At least my shaft didn't break or totally destroy the tranny. I'm looking at least $1k in parts for the tranny + ~$800-1200 for a good clutch and $250-400 for a driveshaft. I will definately be going back with something bulletproof. I hate it but I guess the old plastic is going to have to finance this. I can't stand to wait and have it down any longer.

 

Wow! I guess I can learn from you guys because I think I have been really lucky. I have a high milage t56 with the stock drive shaft and upgraded universal joints. Maybe I should think of upgrading. The last time I dynoed I stoped at 4500 because of fuel issues, that may have saved my shaft and trany. I am learning alot from you guys. I did go to 6k at 17psi and made 550hp and 650tq in 4th. Good info guys. Sorry again about the trans.