The last two times we drove the 67 we have had some noise coming from transmission when it's in reverse. Lots of metal to metal noise. It don't sound like gear grinding at all. The only time it does it is after we get done driving for a while.

I drove it about 50 miles on the return home and when I was backing it in the garage that is when it started doing it. It did not grind going into reverse but it started doing it when I let out on the clutch and started backing up. As long as I left it in reverse it was making the noise. So I took it out and shut her down and pushed the car in.

No noise at all in the forward gears.

Could it need reverse to be adjusted or is it something else???

There is ZERO adjustment for reverse. It is either In or OUT of reverse.
Wanna try to give a better description of the noise in reverse? Grinding? Growling? Whining? Clicking? What?
Of course, it really doesn't matter, if it is making an abnormal noise, then most probably one or more of the 3 reverse gears (front idler gear, rear idler gear and reverse sliding gear) needs to be replaced. Oh ya, and the absolute worst part is that the cluster gear could have a chipped or broken tooth (reverse is driven by the cluster gear).
If it is really a bad noise, the ONLY solution is to pull the tranny and remove the tail housing to take a look------------------and go from there.
If there is a chipped or broken tooth, it eventually could circulate through the oil and cause damage to other gears/bearings.
Oh, I'm sorry, were you wanting some GOOD news?

There is ZERO adjustment for reverse. It is either In or OUT of reverse.
Wanna try to give a better description of the noise in reverse? Grinding? Growling? Whining? Clicking? What?
Of course, it really doesn't matter, if it is making an abnormal noise, then most probably one or more of the 3 reverse gears (front idler gear, rear idler gear and reverse sliding gear) needs to be replaced. Oh ya, and the absolute worst part is that the cluster gear could have a chipped or broken tooth (reverse is driven by the cluster gear).
If it is really a bad noise, the ONLY solution is to pull the tranny and remove the tail housing to take a look------------------and go from there.
If there is a chipped or broken tooth, it eventually could circulate through the oil and cause damage to other gears/bearings.
Oh, I'm sorry, were you wanting some GOOD news?

Hey Tom, could it be a noise from the fork, maybe the 1/2 clutch out of position and the fork is in contact making a noise?? That might explain why the noise comes on after the trans heats up and the oil thins out.

Just a thought.

Tom I was hoping for good news. I can go out there and start it up right now and there is no noise at all though and everything works fine. I can go to reverse numerous times and it is fine. You have to get it hot before it makes any noise. The noise is more like a growling.

Could material in the tranny change size with heat and the viscosity of the gear oil being really thin when warm make it worse and therefore when it is cold it doesn't do it?

Wally what do you mean by the clutch being 1/2 off?

Someone told me to check make sure none of the rods for the 1-2 and 3-4 are moving once I put it in reverse. This car has a Muncie shifter as well as the stock rods.

I will have to check back tomorrow to see if anyone has anymore info.

I think Wally means the 1st/2nd gear shifter fork may not be properly positioned in the groove of the syncro slider. But if it has been OK in the past, then is should still be OK. Thus, I suspect something is wrong with one of the 3 reverse gears. For that matter, it could be the bushings inside the rear (long) reverse idler gear have gone bad.
Bottom line: no matter what it is, the ONLY way you will know for sure is to pull the tranny and remove the tail housing------------------and go from there.
Just pull the tranny out, run it by the house and I'll check if for you.

We took it apart today and the reverse gears had a little chewing on the ends of the teeth but I was told that was normal. No other gears were chipped. The sycros looked great. The sliders had a little wear in the center of the splines but that was it. They felt pretty tight and slid easy over the gears.

The only thing we seen was a thrust washer that look like it had been spinning. The one with the little tab sticking out or what was left of the tab it was almost non-existant. Where that tab fit in, the case was gouged like it was trying to get out of there. So we found one that was in pretty good shape and put it in.

If that thrust washer was spinning would that make a scraping and grinding noise. That is the only place we could see that might have been acting up.

The pin that went through reverse gear was just slightly a little loose, the one with the bronze bushings pressed in.

I certainly could be possible that the reverse thrust washer (one with a tang on it) is making the noise if it is spinning. IT IS NOT SUPPOSED TO SPIN! When I rebuild trannys what show some gouging at the slot for the tang on the thrust washer as you described, I use a very small pair of vise grip pliers to bend that tang a little more so that it fits a little deeper in the slot.

That tang was just about wore off. So we found a good one and put it in and bent it out just a little more. I am crossing my fingers that it solves the problem. Should have it in there by Sunday I hope.