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First Impressions of Buick Lucerne
#14
I think he is confusing this with the Super Turbine 400 transmission that Buick used back in the '60s in the full sized cars. It has a variable pitch stator in the torque converter. it launches in high stall to give greater torque multiplication, and above a certain RPM/engine load (or a micro switch on the carb linkage) it would drop back to low RPM stall speed for greater fuel economy and less slippage.

I put one in my GSX, and it launches with a 3500 rpm stall converter, but drops back to a 1300 rpm stall converter driving down the freeway or around town. It is effectively like a 6 speed transmission. This is the transmission that the Turbo Hydramatic 400 transmission is based on. The 4L80E is the 4 speed overdrive version of the TH400, but lacks the mounting bosses and blocked passages in the casting to allow you to convert and make it into a dual stall overdrive 4 speed automatic. Its a shame, as a stock one is good for an 800 lb/ft engine, and way beyond that if modified properly.
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Messages In This Thread
First Impressions of Buick Lucerne - by Grumpyguy - 04-17-2009, 03:34 AM
Re: First Impressions of Buick Lucerne - by AAA - 04-17-2009, 04:14 AM
Re: First Impressions of Buick Lucerne - by billb - 04-17-2009, 12:30 PM
Re: First Impressions of Buick Lucerne - by JPK - 04-17-2009, 05:52 PM
Re: First Impressions of Buick Lucerne - by Racer X - 04-17-2009, 11:57 PM
Re: First Impressions of Buick Lucerne - by JoeH - 04-18-2009, 05:07 PM
Re: First Impressions of Buick Lucerne - by JoeH - 04-18-2009, 11:09 PM

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