Small Drums?

[Tyler Searle]

Anyone ever had transmission drums that were worn so much that the bands wouldn’t contract enough to stop them?
Supposedly that is the problem with a roadster I just purchased but the owner passed away and so I’m just going by what his brother “thinks” the problem is. Car has the hogsheads removed and has been like this for 4 years or so.
I was thinking to just get the bands relined and give it a try. I don’t have the bands that were on the car so I don’t know how worn the lining was. The previous owner was a very experienced T’er.
Anyone ever experienced this?

[Mark Gregush]

Did you try adjusting the band first?

[Henry K. Lee]

Tyler some of the aftermarket bands did stretch and the lug ears would bend giving this condition. Lining from a new source would normally not give you this condition in my honest opinion. Excessively worn pedal cams are another problem child. Take a real good look.

Hope this Helps,

Hank

[Scott_Conger]

Henry is giving excellent advice re: checking pedal support ramps (cams) as a potential source of the bands not tightening properly

Now is the time to repair or renew them while the hog's head is off as they are invariably shot after a lifetimes use and are usually overlooked during repairs.

[Tyler Searle]

Mark: bands were removed and I didn’t find them.

I think the consensus is correct, rebuild everything on the hogsheads, that and new band lining will hopefully remedy the situation. Thanks for the help everyone.

[Scott_Conger]

BTW Tyler, welcome to the forum

[speedytinc]

Mark: bands were removed and I didn’t find them.

I think the consensus is correct, rebuild everything on the hogsheads, that and new band lining will hopefully remedy the situation. Thanks for the help everyone.

Agree.
look @ the drums. Do they appear all the same diameter? Normal wear is not likely to wear them down enough to be a problem. Its possible someone could have over machined the drums during a rebuild. I have seen this. In which case, one can shim the lining up to make it "thicker" to compensate. This is an uncommon scenario.

[Tyler Searle]

John, do you or anyone else know what an acceptable diameter is for a drum? I think I’ll measure mine and see where they’re at. Never thought about shimming the lining, good idea.

Scott, thanks for the welcome. I used to be active on the forum a few years back but lost my password when the format was changed. Maybe more than a few years ago? Been into T’s for about 20 years now and have several. Or are five more than several?

[Steve Jelf]

Can a drum be worn down or machined down so far that the band can't grab it? I doubt it. But if it can and has, I expect that's made it so delicate it should be replaced.

[speedytinc]

John, do you or anyone else know what an acceptable diameter is for a drum? I think I’ll measure mine and see where they’re at. Never thought about shimming the lining, good idea.

Scott, thanks for the welcome. I used to be active on the forum a few years back but lost my password when the format was changed. Maybe more than a few years ago? Been into T’s for about 20 years now and have several. Or are five more than several?

All depends. The standard size is 7.5". Drums are cast & machined. Later drums are typically not machined on center. One side is thick & the opposite thin. Depending on that variation determines the safety of removing material. The thinner that one side, the more likely to crack across the face. Generally .005-.010 off the face is safe. .005 is the typical minimum cut to square the drum to the shaft. No need to clean to 100%, 80% is good.

[Tyler Searle]

Steve, my thoughts exactly.

John, thanks again for your advice.

Tyler