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64 transmission rebuild help
Posted by: kaminski45 ()
Date: December 08, 2017 11:13AM

I'm rebuilding the transmission on my 64 and am at the point that where I need to remove the bearing off the front side of the main shaft. Is there a special type of puller that I need to get it off or will a general puller work? I know that there is a tool built by GM for this but don't want to spend the money buying one for a one time use.

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Re: 64 transmission rebuild help
Posted by: caroseiii ()
Date: December 08, 2017 02:28PM

Press it off to avoid damaging first gear... See GM photo from 1961 film strip.

Crawford

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Re: 64 transmission rebuild help
Posted by: Wagon Master ()
Date: December 08, 2017 03:37PM

If you are indeed talking about the front bearing,it is usually a very slight press fit and can be removed with a brass hammer on 4th gear.

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Re: 64 transmission rebuild help
Posted by: kaminski45 ()
Date: December 08, 2017 03:42PM

Yes it's the one on the fourth gear side. The main shaft is still in the case and the service manual says that it needs to be removed before the shaft comes out.

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Re: 64 transmission rebuild help
Posted by: Wagon Master ()
Date: December 08, 2017 03:58PM

Have never disassembled or assembled them the way the service manual suggests, but if you must.
Remove the inner "selective" snap ring.
Slide the front bearing and 4th gear out a bit. Put a 1/8" piece of key stock (or equivalent) under both sides of outer snap ring.
With a brass, lead hammer or block of hard wood smack 4th gear back into the case.
Swap out 1/8" for thicker key stock (or equivalent), repeat until bearing comes free.

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Re: 64 transmission rebuild help
Posted by: caroseiii ()
Date: December 08, 2017 08:04PM

I misunderstood! See attached Page 2 of the factory image. To do it without the tool, I agree with removing the snap ring and working it through the bearing but sometimes you will have to hammer it out if you do not have the factory tool.

Crawford

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Re: 64 transmission rebuild help
Posted by: Wagon Master ()
Date: December 08, 2017 08:32PM

Or, do as I've done​ for years.
Remove all shift forks, rods, springs and detent balls.
Drive the counter shaft pin to the rear letting the counter gear to drop in the case.
Counter gear thrust washers will fall out.
Remove two small snap rings from bores in rear bearing.
Wiggle and slide mainshaft out of the rear of case. Needle bearings at front of mainshaft and 4th gear will fall into case.
Wiggle and remove front bearing and 4th gear from case.
Remove counter gear.. Some needle bearings and spacers will fall out.
Run a magnet inside the case and take inventory of small parts.
P.S.
I've never used a press to disassemble the mainshaft either.smoking smiley


'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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