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Got myself a second T-4. Could not resist at $20 incl a couple of motors and a Hobby King brushed esc.

I never knew the T-4 came as both three and four wire.
At first I thought the three wire was modified, but looking at the casing there is only room for three wires.
Anyone knows why it was changed? And what version came first?

Are they both with 4 screw cases?

Had to go out to my cold workshop to check.

Yes, they both have four screws.

The reciever wires also exits in different locations.

That is really cool! I like the offset wires!

Oooooh! It gets even better!
I found T1/T4 instructions online.

Three power wires and the reciever wires centered!
So a third variant?