I took apart a spare transmission I have had for years to access a reverse drum needed for a rebuild and had a heck of a time removing the driven gear. I have done this many times before and know that getting the driven gear off can be a tough job but this time I had to repeatedly heat the driven gear red hot in order to get it off. My question is should I toss the driven gear after all that heating or is it still usable. The gear is otherwise in good shape so I would not want to discard it if it can safely be used again after all that heating.
I use it
If it fits tights
These can be a real booger to get off
It really helps to use and original Ford driven gear puller.
I had one that was really stuck, even after soaking for weeks in ATF. It bent the Ford puller and I ended up making my own.
I have rebuilt several transmissions in which the owner tells me it has been rebuilt previously. In a couple of instances the driven gear teeth were badly damaged. I suspect, but never proved, that heating the driven gear on the first rebuilt, caused loss of hardness in the gear which then wore out.
I think that once heated, the driven gear should be replaced.
After using a 12 ton press to remove driven gears the issue became easy with no heat. I did have to use a longer handle on the press pump. Pictures were posted some years past on the method.
I use this Home Made puller with great success.
I am no metallurgist but my concern was that the heat would harden the gear teeth to the point where they became brittle. I may be way off base on this but while I hate to waste a original Ford part I'd hate pulling an engine to replace the driven gear more! I guess it goes in the scrap pile!
I think it's too soft after being heated red hot - you can probably reharden it, so don't throw it away - maybe it can be of use if it isn't worn out?
Ford Driven gears were hardened to about 40 Rc. When you heated it red, you most likely drew all of that back to dead soft. The tempering temperature to achieve this hardness is around 750 deg F. If your gear was red, you were way above that. Throw the gear away.