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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Successful Transplant !
Date: Mon, 28 Oct 2024 08:08:08 -0400
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"Snag"  wrote in message news:vfmm48$lo8n$1@dont-email.me...

   I'll check with the guy that built it this week . It's possible that
the rebuilt converter he supplied doesn't have lockup , I understand
that some don't but that may be an aftermarket thing
Snag
--------------------------------------
https://gearstar.com/what-is-lockup-torque-converter

A torque converter is like one fan blowing on another fan to transfer 
rotation while allowing slippage without wear, though it wastes energy as 
heat. The lockup is a clutch that connects the two fans (turbines) together 
when conditions allow. The indication of lockup is the tach needle moving in 
sync with the speedo needle instead of jumping when you change gas pedal 
pressure.

https://fitzequipment.net/how-to-test-a-torque-converter/
In Drive with the brakes locked full throttle engine RPM should be around 
2000 unless you have the actual specs.

Torque converters developed the simpler fluid couplings of the late 1930's 
and were highly improved for WW2 airplane engine superchargers, to isolate 
crankshaft power stroke vibrations from the high flywheel inertia of the 
compressor rotor.

https://en.wikipedia.org/wiki/Hydramatic