Can't find brass synchro rings so looking for additive.

[Wallus57]

Hey folks. I can't find brass synchro ings for my A903 anywhere so I'm going to have to reassemble it as is.
So what kind of additive can I use to give the old rings a little more friction. I'm running atf now but it's still clashing going from first to second And very hard to downshift from third to second.
Any ideas?

 

[R413]

Type F is the has the least amount of lubrication of any ATF so try that.

find a car with dirty ATF and pull it out and use on your manual.

 

[pnora]

Is it grinding from 3rd to 2nd?

 

[coloradodave]

Try here: NOS Mopar Transmission Inner Synchronizer Stop Ring 1952-62 3 Speed 1963-9 A903 - Hiltop Auto Parts

 

[padam]

Hey folks. I can't find brass synchro ings for my A903 anywhere so I'm going to have to reassemble it as is.
So what kind of additive can I use to give the old rings a little more friction. I'm running atf now but it's still clashing going from first to second And very hard to downshift from third to second.
Any ideas?

You could try to recut the grooves in the rings you have.

Maybe you can get a very sharp 3 corner scraper and scrape out the grooves. It might help them bite enough to sync better.

 

[Krooser]

Try GM Synchromesh Fluid...

 

[padam]

You could try to recut the grooves in the rings you have.

Maybe you can get a very sharp 3 corner scraper and scrape out the grooves. It might help them bite enough to sync better.

I mean slip better, duh.

 

[Wallus57]

No. Just very stiff unless I slow down to maybe 10 mph, then it's not as bad.

Is it grinding from 3rd to 2nd?

 

[Wallus57]

You could try to recut the grooves in the rings you have.

Maybe you can get a very sharp 3 corner scraper and scrape out the grooves. It might help them bite enough to sync better.

I did think abou that but they are very fine grooves. I'm going to put it back together today so I'll try and do some file "machining" of the synchros lol. Take off some rough edges so to speak.

 

[Wallus57]

Try here: NOS Mopar Transmission Inner Synchronizer Stop Ring 1952-62 3 Speed 1963-9 A903 - Hiltop Auto Parts

Unfortunately my transmission doesn't have that type of synchro. It's just a regular slider and brass ring synchro. That's why I'm having such a hard time finding them. It's an odd duck.

 

[pnora]

No. Just very stiff unless I slow down to maybe 10 mph, then it's not as bad.

Sounds more like a clutch that's not fully dis-engaging. Is first gear synchronized on that model trans?