Torqueflite question

[mrbill426]

I've been reading my MP Chassis book and it says that the majority of automatics in the 60s and 70s came with "lock-up" transmissions which cannot be used with race converters.  I how can I tell the difference between a lock-up and a non-lockup 727???    Or, am I reading the book wrong? 

If the "majority" of these trannys are lock-ups, where do all the race 727s come from? What transmissions (with race converters) were they using in the 70s??

I have a spare 727 that I want to install in a 440 project car, but am now wondering if it's "junk"  .  It has numbers on the pan rail, but I don't know what they mean.

Bill
 

[Chryco Psycho]

I do not recall a lock up version until the mid to late 70s

[71challengher]

I do not recall a lock up version until the mid to late 70s

My 79 had lock up convertor. When that trans went I changed it to an 71 trans.

[GoodysGotaCuda]

I do not recall a lock up version until the mid to late 70s

I would say late. Definately no 60s or early 70s

[oldkimmer]

1978 is the only for a BB 727.......u will know when u see 1, as on the input shaft the last inch ro so is smaller and has no splines..........Kim.........

[tactransman]

Lock up or non lock up , this is how you tell.
Input shaft- Non -lock up left.  Lock -up right (with pilot on tip)
Valve body -tube with auxilary valve body= lock up (first year available 1979-on)
Valve body - without tube = non lock up
727 or 904 it is the same.
The only difference between a 727 and a 904 VB is the parking rod.

[mrbill426]

Thanks for the pics, love pics, they tell a lot.   
Mine is not a lock-up; turns out it is from a '72 big block B-body. 

 

[tactransman]

I've been reading my MP Chassis book and it says that the majority of automatics in the 60s and 70s came with "lock-up" transmissions

I don't know why it would say that because the lock up was not introduced till '79.

[mrbill426]

From what I am told there are several tech errors in that book