revisiting After side shift tranny rebuild - still shift into 1st issues, About 50% goes shift right in, 50% no can do Options

[jjs3rd914]

Side shift tranny rebuilt

All gears shift beautiful but 1st, linkage adjusted properly, bushings all new
No issues with clutch tube in tunnel
New PP, TO bearing, 6 spring clutch disk
Stock flywheel cut .025" and TO bearing fork pivot ball washer added by .025" to the stock .060"
All motor mounts good
Clutch adjusted properly

Used very good 1st reverse slider
Used almost new 2nd-5th dog teeth with appropriate brake bands etc.
Used NEW synchro ring

About half the time it goes right into 1st very smoothly. No grinding, no issues with reverse, linkage feels great. Other times will not budge into 1st gear. By going into 3rd gear first then trying seems to work most of the time as workaround.

SO after reading numerous threads we have concluded that could the issue be

1. Are new synchros much stiffer than used one. SO DO THEY NEED TO BE WORN IN?
Could that be part of the problem and could problem diminish with use?

2. And Using a 2-5 dog tooth gear and brake bands also be part of the problem?

I do have original 1st gear brake band and am willing to buy the correct 1st gear dog gear.
Also I have many good usable "worn in" synchro rings to use instead of the new one.

So if problem does not go away, could I be faced to replace the above to get it right?

I have no issue doing so. Just want it right.

So anyone else faced with simliar issue and how did you solve it. Some Prior threads seem to point into maybe not using a new synchro and not using the 2-5 dog gear.

Thanks
jjs3rd914

[wndsrfr]

Side shift tranny rebuilt

All gears shift beautiful but 1st, linkage adjusted properly, bushings all new
No issues with clutch tube in tunnel
New PP, TO bearing, 6 spring clutch disk
Stock flywheel cut .025" and TO bearing fork pivot ball washer added by .025" to the stock .060"
All motor mounts good
Clutch adjusted properly

Used very good 1st reverse slider
Used almost new 2nd-5th dog teeth with appropriate brake bands etc.
Used NEW synchro ring

About half the time it goes right into 1st very smoothly. No grinding, no issues with reverse, linkage feels great. Other times will not budge into 1st gear. By going into 3rd gear first then trying seems to work most of the time as workaround.

SO after reading numerous threads we have concluded that could the issue be

1. Are new synchros much stiffer than used one. SO DO THEY NEED TO BE WORN IN?
Could that be part of the problem and could problem diminish with use?

2. And Using a 2-5 dog tooth gear and brake bands also be part of the problem?

I do have original 1st gear brake band and am willing to buy the correct 1st gear dog gear.
Also I have many good usable "worn in" synchro rings to use instead of the new one.

So if problem does not go away, could I be faced to replace the above to get it right?

I have no issue doing so. Just want it right.

So anyone else faced with simliar issue and how did you solve it. Some Prior threads seem to point into maybe not using a new synchro and not using the 2-5 dog gear.

Thanks
jjs3rd914

Both of mine are bitchy going into first...sometimes drop right in, most times hard to get that full click in. Try just a bit looser on the clutch cable maybe to see if that helps. I always drop it in just before the car comes to a stop but it's bad if I let it sit in neutral then try for first...

[BeatNavy]

Both of mine are bitchy going into first...sometimes drop right in, most times hard to get that full click in. Try just a bit looser on the clutch cable maybe to see if that helps. I always drop it in just before the car comes to a stop but it's bad if I let it sit in neutral then try for first...

I have precisely the same experience. Sometimes right in, other times right in after putting in 3rd AND THEN 1st, and other times requires a little more brute force. And this is on a rebuilt gearbox.

[jjs3rd914]

Both of mine are bitchy going into first...sometimes drop right in, most times hard to get that full click in. Try just a bit looser on the clutch cable maybe to see if that helps. I always drop it in just before the car comes to a stop but it's bad if I let it sit in neutral then try for first...

I have precisely the same experience. Sometimes right in, other times right in after putting in 3rd AND THEN 1st, and other times requires a little more brute force. And this is on a rebuilt gearbox.

Curious

Was a new synchro ring used on 1st?

and

Was a 2-5 dog gear used with corresponding dual brake bands.

I did a lot of research and determined that using a 2-5 dog tooth gear on first was not an issue.

So I'm leaning towards the new very stiff synchro ring is contributing to the problem. Of course this assumes everything else has been ruled out, clutch adjust, linkage adjusted, new bushing, etc, etc.

?????

Thanks

jjs3rd914

[BeatNavy]

Both of mine are bitchy going into first...sometimes drop right in, most times hard to get that full click in. Try just a bit looser on the clutch cable maybe to see if that helps. I always drop it in just before the car comes to a stop but it's bad if I let it sit in neutral then try for first...

I have precisely the same experience. Sometimes right in, other times right in after putting in 3rd AND THEN 1st, and other times requires a little more brute force. And this is on a rebuilt gearbox.

Curious

Was a new synchro ring used on 1st?

and

Was a 2-5 dog gear used with corresponding dual brake bands.

I did a lot of research and determined that using a 2-5 dog tooth gear on first was not an issue.

So I'm leaning towards the new very stiff synchro ring is contributing to the problem. Of course this assumes everything else has been ruled out, clutch adjust, linkage adjusted, new bushing, etc, etc.

?????

Thanks

jjs3rd914

Honestly, I can't remember. I sent the internals to Dr. Evil, and he refreshed it about 2 or 3 years ago. I'd have to go through a long string of PM's to see what he replaced and what he assessed as not requiring replacement. Don't get me wrong, I'm happy with it and with Mike's service - just 1st gear is sometimes "bitchy" as wndsrfr describes.

I have another 901 sitting in my basement that I rebuilt. Pretty much everything is brand new in that, and I'm looking forward to seeing how it performs once I have reason to mate it to something.