The amazing Th-400 trans still going strong in 2023 in drag racing circles

I just read an article about a drag race engine producing 2500 plus  HP using a TH-400 trans behind it 

Sure the trans was modified some to handle that kind of power but was still a big ( good )  surprise to me 

Often seeing drag race cars with 1000 to 2000 HP these days on the tracks  in drag racing 

The TH-400 trans being the first  of it’s kind in 64 was overbuilt as the newer years internal  trans parts were changed no dough   to be saving GM dollars ( less clutches in newer ones ) 

I very seldom since 2006 have seen one of these transmissions requiring a rebuild while many have had issues with the Jetaway Hydromatic over the same period of time

Just recently a couple of issues have come  up with the TH-400 trans needing service from small issues to a complete rebuild on our site ( time and mileage taking its tole ) 

It is this tans Torque Converted design that allows this trans to have instant power available at any given moment it is required ( always ready to put power to the ground if called on at any speed ) 

Mine has only required a speedometer gear replacement due to a trans leak that developed in that area and was an easy fix once realizing changing the gear ( same number of teeth )and not it’s  seal was the solution to repairing the leaking 

The gear shaft itself had worn down allowing trans fluid to be seeping around it and out the seal 

Hope  do you HATE  oil leaks under the car  as much as I do !!!  


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