I have my 1972 4 speed apart on bench for rebuild. Question is I have 2 different types of synchro lock rings a Pair of round and a pair of flat can anyone tell me anything about these and their orientation.
thanks guys

Either or ... just pop them in. Orientation doesn't matter.

I can't see the style of side cover you have but if its the good early model then you need to lop those tips off the shift forks.

I've never seen round rings in any older a-833 ever taken apart.
Will they work? Can't say cause never used, or tried them.

X2 ,,,, Never seen round rings in an 833.

Scissors dentent/interlock started in 71 so those would be correct for a 72 trans .

The round wire ones were used in the A230 3-speeds. Not sure why though. A230/A833 share some parts in relation to the syncro hubs/sleeves/etc.

All those rings do is put pressure on the dogs. They don't care if they're round or square. FWIW, I'm pretty sure they were round in the five boxes I've rebuilt - one 23 spline and four 18 spline.

Besides, the trans needs four and four is all ya got !!

Look what I found in my stuff today ... not only are they round but they have that kink in them

I think NP, New Process, change the syncro assemblies 3 times in the production NP 833 4 speed Mopar tranny from 1964 up to the last change in 1970, maybe more or less
I have seen three different types of synchro assemblies in those trannies, The later ones shift a lot better than the earlier ones did

The 69 and older springs are round. The springs in question are the 70 & newer style.