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Oct 13, 2013 | 09:11 AM

bschuus

Thread Starter

Instructor

Joined: Dec 2011

Posts: 197

Likes: 27

From: New Jersey

Auto trans

Will a 400 auto trans fit in a 80 Vette?

Oct 13, 2013 | 09:19 AM

hugie82

Safety Car

Joined: Mar 2007

Posts: 3,652

Likes: 49

From: Bridgewater nj

Yep! You'll need to hook up a electric kick down switch and a different drive shaft.

Oct 13, 2013 | 11:54 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

Likes: 3,114

From: Crossville TN

Yes, but why would you want one? That tranny is bullet-proof...but it is also very heavy, the most inefficient tranny in GM's line of automatics, and does not have an overdrive range.

If you only want it for drag racing, and it is coming to you "free", maybe it would be a good idea. Otherwise, re-think which transmission you should install.

Oct 13, 2013 | 04:45 PM

bschuus

Thread Starter

Instructor

Joined: Dec 2011

Posts: 197

Likes: 27

From: New Jersey

I was thinking going from a 350 trans to a 400 trans would be an upgrade. I thought it would also help with highway driving.

Oct 13, 2013 | 07:24 PM

Roco71

Melting Slicks

Joined: Jul 2009

Posts: 3,264

Likes: 3

From: Vero Beach FL

I don't think its going to help much to increase your fuel mileage, 400's are known for sucking a fair amount of HP.

Oct 13, 2013 | 07:41 PM

diehrd

Safety Car

Joined: Jan 2009

Posts: 4,000

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From: New York

Your 1980 has lock up , so it will be better off with a TH350C then it would be with a th400

Oct 13, 2013 | 08:20 PM

bschuus

Thread Starter

Instructor

Joined: Dec 2011

Posts: 197

Likes: 27

From: New Jersey

Quote:

Originally Posted by diehrd

Your 1980 has lock up , so it will be better off with a TH350C then it would be with a th400

Thanks for the input guys. I'll keep what I have and just fix the leaks and save a few bucks.👍

Oct 13, 2013 | 11:10 PM

aussiejohn

Drifting

Joined: Jul 2002

Posts: 1,944

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From: The only Corvettes in Highett Victoria

Quote:

Originally Posted by bschuus

Thanks for the input guys. I'll keep what I have and just fix the leaks and save a few bucks.👍

Take it to an auto trans specialist and suggest have him put a Transgo kit in it. It will shift better and the clutches will last longer with normal driving.

The 400 is a great trans, but the TH350 with a good kit in it will be as good as a TH400 and a hell of a lot cheaper to upgrade than to replace with a 400. The tailshaft length, output yoke, crossmember will all have to be changed if you go to a 400.

Regards from Down Under.

aussiejohn

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Oct 14, 2013 | 05:48 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

Likes: 3,114

From: Crossville TN

Doubt that the clutches will last longer with a shift kit. Hard shifts eat up clutch disc material. The shift strategy used by the manufacturer will provide the longest life for normal use (including the occasional 'hot foot').

Now, if you are drag racing the car a bunch, a shift kit might be the right thing to do.

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