4L60E input shaft ?
Thread Starter
Burning Brakes
Joined: Nov 2010
Posts: 1,112
Likes: 62
From: Chicago IL
4L60E input shaft ?
I've got the trans at FLT and while its apart I'm debating what to upgrade while its there. They were talking level 7 build. I'm curious at what RWHP level or ET are guys breaking input shafts foot braking their cars ? Obviously they want to upgrade the input shaft to the latest and greatest but is it really worth it ? My regular trans builder says it's rare guys break the input shaft. I've personally never broken an input shaft in my race cars or while driving my buddies cars. All 8 second 1/4 cars...
The torque converter is out and getting loosened. Looking to foot brake the car to 2800-3000 rpm's and leave around 5 or 6lbs of boost. I'd like to 60 foot in the 1.40's.
The torque converter is out and getting loosened. Looking to foot brake the car to 2800-3000 rpm's and leave around 5 or 6lbs of boost. I'd like to 60 foot in the 1.40's.
Pro
Joined: Apr 2005
Posts: 715
Likes: 4
I broke the stock input shaft in my 4L80E. It was a stock shaft with a trans go trans pack in the trans.Yank PY 3800 converter, 800RWHP turbo gto.Drag radials.It broke when I was burning through 2nd gear and when it shifted into 3ed it dead hooked and went to neutral/busted shaft.I now have a full built RPM 4L80E..I also have a turbo c5 with a LevelX RPM trans!!
Thread Starter
Burning Brakes
Joined: Nov 2010
Posts: 1,112
Likes: 62
From: Chicago IL
I broke the stock input shaft in my 4L80E. It was a stock shaft with a trans go trans pack in the trans.Yank PY 3800 converter, 800RWHP turbo gto.Drag radials.It broke when I was burning through 2nd gear and when it shifted into 3ed it dead hooked and went to neutral/busted shaft.I now have a full built RPM 4L80E..I also have a turbo c5 with a LevelX RPM trans!!
Good to know.. Thx Hopefully I can come to a decision by next Monday. Cost and responses in this thread will help aid my decision.
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 137
From: SoCal CA
My trans builder said my next mod to the trans should be hardened shafts now that I'm at 850hp. He said wheel hop, vibration and dead hooking if launching hard is what breaks them. Check out sonnax. They make the hardened 300M shafts
Last edited by C5Natie; Jun 17, 2016 at 11:19 PM.
Thread Starter
Burning Brakes
Joined: Nov 2010
Posts: 1,112
Likes: 62
From: Chicago IL
Gotcha. I was looking at a 1 piece pressed together billet shaft and drum deal. I believe it's priced around $700... I haven't heard back from the builder since I dropped the trans off
Racer
Joined: Nov 2015
Posts: 496
Likes: 35
I upgraded to RPM's Level VII from their Level V at their recommendation because of the input shaft. I'm only at 750 WHP now but told them I planned on upping that to 800+ in the very near future. They said I really needed the input shaft upgrade that came with their Level VII build even with only 750 WHP.
Thread Starter
Burning Brakes
Joined: Nov 2010
Posts: 1,112
Likes: 62
From: Chicago IL
I upgraded to RPM's Level VII from their Level V at their recommendation because of the input shaft. I'm only at 750 WHP now but told them I planned on upping that to 800+ in the very near future. They said I really needed the input shaft upgrade that came with their Level VII build even with only 750 WHP.
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 137
From: SoCal CA
You can get Sonnax's smart input drum with the shaft. That's the best drum on the market. I've been really happy with it.
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Thread Starter
Burning Brakes
Joined: Nov 2010
Posts: 1,112
Likes: 62
From: Chicago IL
Lots of looks but at the end of the day only 1 person has actually broken an input shaft. Seems like builders suggest the billet shaft over 800 RWHP. To sum Themis thread up so far.