4l80E input shaft same as a TH400?

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Bob Hollinshead
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4l80E input shaft same as a TH400?

Post by Bob Hollinshead » Tue Apr 14, 2015 7:30 am

Is the input shaft on a 4L80E the same as a TH400? Reason I'm asking would it be possible to build a 4L80E like an old school Clutch turbo400?
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Alan Roehrich
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Re: 4l80E input shaft same as a TH400?

Post by Alan Roehrich » Tue Apr 14, 2015 6:28 pm

No, it is not the same. Having built several clutch turbo transmissions, I can honestly say there are things in a 4L80E that probably wouldn't like the clutch turbo kit.

You can get Mark Williams to make you a shaft, if you're set on doing it.

Winters had the best parts for the clutch turbo, Jim Beattie of ATI and I tried to buy the tooling about 10-12 years ago, but it was already gone.

Setting up the bellhousing is extremely critical to making it work and preventing leaks. Then the clutch is the key to getting it to live.

A friend and his brother campaigned one successfully for many years in a big block Chevy Super gas car, I did their transmission work, they handled the set up in the car and the clutch.

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Re: 4l80E input shaft same as a TH400?

Post by pdq67 » Wed Apr 15, 2015 6:15 pm

How about a clutch-T400 with a Gear Venders on the tail end if you are just after a STRONG overdrive automatic tranny??

Off topic.. ---- Continuing..

I think I talked to Jakeshoe years ago about a full manual 4L80, no electric stuff at all except perhaps a lockup converter.

I think he said he could fix me up with one.. It's been a good while ago......

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Re: 4l80E input shaft same as a TH400?

Post by Bob Hollinshead » Fri Apr 17, 2015 1:33 pm

The gear vendors would be a good way to go but pricey IMO. People have been doing the full manual 4L80E for a while now and from what I've read it's an easy change. Looking at the strength of the 4l80E and benefit of overdrive I was just thinking clutch version might be an economical way to running an overdrive and still would be plenty strong enough for my needs. Plus with an adjustable clutch might work good when at the track and adjust for the street with overdrive.
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