gearbox salvage and repair
 

recently I seem to have caught up on the PM on my old fords, so got into sorting my workshop.
On the bench was a rough looking gearbox casing (78 -7006).
It had a half baked repair on the rear cluster gear thrust face.
I cleaned it up and dummy assembled a gear set into it.
Measured the end float and worked out what thickness spacer to machine up.
I then found that the cluster gear thrust washer was RS and one of the very hard to get ones.
In my spares I had new 8M-7129 ( readily available), so did a small machining job on the cluster to fit the new thrust washer on .
then, I worked out the dimensions of the spacer and machined one up, I made it so the 8M-7128 washer would fit in and locate on the spacer.
I machined some oil grooves into the spacer to allow more oil to get rear cluster bearing area.(over kill I think)
I also made a dowel to stop my spacer from turning.
All in all ,it turned out better hat I expected.
Now I have a real good spare with an 022A series gearset.
Lawrie

Re: gearbox salvage and repair
 

Never seen a cluster face worn into a recess in the case! That case will need to be blasted inside to remove all that rust. I have found many painted with Glyptal red insulating paint that will hold up to the oils in the case.

Necessity is the the mother of invention.

Re: gearbox salvage and repair
 

Outstanding Lawrie.

Re: gearbox salvage and repair
 

Lawrie: Congrats on doing such a fine repair and salvage job.

Re: gearbox salvage and repair
 

Did you actually cut the rear of the cluster on your mill? I would have figured it to be too dang hard to machine . . . . you must have used some carbide type bit? Just curious how you did it?

Re: gearbox salvage and repair
 

I have an insert cutter on the mill, I fit special inserts for machining very hard material, they do a good job,I also use them on the lathe when machining down old ford axles and driveshafts, as bar stock.
The gear was very hard.
Lawrie

Re: gearbox salvage and repair
 

Excellent work, Lawrie! The wear in that case is worst I've seen.

Re: gearbox salvage and repair
 

Nice looking repair !!! Saved that when most might have tossed , looks good !!


I am just about to redo mine in the 34, any good reference sites ? Or how to rebuild books out there ?

Re: gearbox salvage and repair
 

Mac VP's book is a must. You can get it on his site VanPelt Sales. Highly recommended.

Re: gearbox salvage and repair
 

Thanks, I will order

started a chat on it didn’t want to hi jack this thread, just seen it was tranny related , thanks