39 Trans teardown

C

curt

Junior Member
Anyone remember the trick for getting second gear off the main shaft? This is in the 37-39 style gears without the brass synchro rings.

Thanks
 
memory a little fuzzy but i seem to recall having to depress a springloaded tab or filler block that is under the gear in one of the shaft slots ???
 
Mac Van Pelts transmission repair manual will be a great help tp you. Well worth the cost. Tom
 
I think there is a 1/16 " pin that has to be pulled. It is underneath a washer that has a slot in it.
 
Curt,
Eye ball the output shaft from the u joint end and as you rotate it you will
notice at one location on the 2nd gear rear thrust washer the end of the retaining
key...you gotta look close. Now rotate 2nd gear until what appears to be an oil
hole comes into view between two teeth. Line that oil hole up over the retaining
key. Now take an appropriate size punch or allen wrench and poke it into the oil
hole. If you do as above you will feel the top of a spring loaded pin which retains the
the key. With your 3rd hand push the end of the key out of its nest as you keep
downward pressure on the spring loaded pin. If a miracle happens it will only take
2 or 3 tries to git 'er done.
Charlie ny
 
Charlie ny said:
Curt,
Eye ball the output shaft from the u joint end and as you rotate it you will
notice at one location on the 2nd gear rear thrust washer the end of the retaining
key...you gotta look close. Now rotate 2nd gear until what appears to be an oil
hole comes into view between two teeth. Line that oil hole up over the retaining
key. Now take an appropriate size punch or allen wrench and poke it into the oil
hole. If you do as above you will feel the top of a spring loaded pin which retains the
the key. With your 3rd hand push the end of the key out of its nest as you keep
downward pressure on the spring loaded pin. If a miracle happens it will only take
2 or 3 tries to git 'er done.
Charlie ny
Click to expand...

Succinct and humorous, nice how-to.

Mart.
 
Last edited:
Curt,
If you are still out there keep something in mind when you reassemble your
trans...this relates to 2nd gear. It's a very bad idea to reuse the 'bushing' that 2nd
spins on, this is one of those obscure details that when overlooked can bite you hard.
2nd gear ideally should have .007 -.010 end play between its two thrust washers.
You'll notice that the front thrust face on the gear is almost non existent. At times
to achieve acceptable end play the gear might need to be replaced....big shocker
right. Too much end play and/or excessive clearance between the ID of the gear
and OD of the bushing is a cause of the dreaded 2nd gear jump out.
Charlie ny
Mac VP and I have all the parts you'll ever need if you need 'em. Macs
book is the BEST insurance you can purchase for success in rebuilding
your trans !
 
Charlie ny said:
Curt,
If you are still out there keep something in mind when you reassemble your
trans...this relates to 2nd gear. It's a very bad idea to reuse the 'bushing' that 2nd
spins on, this is one of those obscure details that when overlooked can bite you hard.
2nd gear ideally should have .007 -.010 end play between its two thrust washers.
You'll notice that the front thrust face on the gear is almost non existent. At times
to achieve acceptable end play the gear might need to be replaced....big shocker
right. Too much end play and/or excessive clearance between the ID of the gear
and OD of the bushing is a cause of the dreaded 2nd gear jump out.
Charlie ny
Mac VP and I have all the parts you'll ever need if you need 'em. Macs
book is the BEST insurance you can purchase for success in rebuilding
your trans !
Click to expand...

Best to stay out of the 'Second Gear Club'.:( Now's the time to do-it-right, a little money spent wisely now will save head scratchin' frustration later.:)
Ditto on Mac's book.
 
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