'39 gears in a '36 case

[cederholm]

Hi guys, along with a pile of other needed parts I picked up a 1936 (48 case) with later 1939 gears, shift tower and shift lever. The gears are perfect but the bearing need replacing.

The gearbox was fully assembled but the syncro modification that Van Pelt talk about hasn't been performed which is preventing the removal of the input shaft.

Van Pelt's modifications here.

I have the rear gear cluster removed, and is seems like if I remove the small ring-clip for the input shaft I could press the input shaft into the case - but I don't want to break anything.

Thoughts?

Thanks,
Carl

[Kurt in NJ]

I put later gears in my 36 case, I just put the input shaft bearing in later ---- to take it apart I pull the bearing first--- I have a puller that catches the snap ring groove----

[cederholm]

Originally Posted by Kurt in NJ

I put later gears in my 36 case, I just put the input shaft bearing in later ---- to take it apart I pull the bearing first--- I have a puller that catches the snap ring groove----

Neat! I like that idea. Thank you.

~ Carl

[Step-down]

Install cluster gear with thust washers but don’t install the cluster shaft . Lay transmission on side . 28 tooth fit with no mod,s to case . 29 tooth I had to polish inside bottom of the case

[cederholm]

Any advice on how to remove the snap ring on the front input shaft? It kinda sucks!

Thanks,
Carl

[JM 35 Sedan]

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That's not the easiest thing to do, but I get them off with patience and perseverance using a pointed Awl and two small flat blade screwdrivers. Once I get them off, if not sprung out of shape, I grind one end, or drill holes in both ends to reinstall and remove again with standard snap ring pliers.

[JM 35 Sedan]

Originally Posted by Step-down

Install cluster gear with thust washers but don’t install the cluster shaft . Lay transmission on side . 28 tooth fit with no mod,s to case . 29 tooth I had to polish inside bottom of the case

Exactly what I have found to be true when installing later/better syncro gears in the earlier cases.

[cederholm]

An awl!! I'll try it! - thanks John.

Carl

[JSeery]

Doesn't VanPelt sell a modified snap-ring that is easier to install/remove?

[cederholm]

I'll soon find out as I just placed an order for all my transmission rebuild parts including a new snap ring set.

That however wont help until I get this last ring off.

I haven't given up yet though.

~ Carl

Originally Posted by JSeery

Doesn't VanPelt sell a modified snap-ring that is easier to install/remove?

[rotorwrench]

His snap rings were made to be removed and they fit the grooves properly. Most other repros have a problem with one or both of those situations. Well worth the money in my book.

[cederholm]

Okay, it took two screwdrivers an awl and an 11 year old kid to help but I got the ring off. Sheesh!

Then, based on Kurt's post, I modified a puller to fit the snap ring grove and started pulling. Much to my surprise once the bearing moved forward enough to allow the assembly to pitch slightly the unit just came apart with no drama. few more minutes on the press and the bearing was fully out.

Now, in preparation for assembly it seems I have a few options and I would like your opinion.

1) VanPelt's site says to modify (by removing some teeth) the syncro the way the Zepher gears are.

2) If, in Step-Down's port, polishing the bottom of the case means grinding the bottom for clearance, there is that.

Originally Posted by Step-down

Install cluster gear with thust washers but don’t install the cluster shaft . Lay transmission on side . 28 tooth fit with no mod,s to case . 29 tooth I had to polish inside bottom of the case

3) re-assemble by pressing the bearing on AFTER the gear cluster is in place. Assuming I can do this without damaging anything.

Thoughts?

Thanks,
Carl