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Transmission Shift Shaft Repair
Posted by: persh ()
Date: October 09, 2018 03:56PM

If going through the shifter system on my EM, everything was in good condition except the the hole in the shaft that comes out of the transmission. It was pretty wallowed out. In all my years I've never had that problem! Any suggestions on a repair that doesn't entail taking the transmission apart??

Thanks,
Van




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Re: Transmission Shift Shaft Repair
Posted by: joelsplace ()
Date: October 09, 2018 03:57PM

Put a bolt in it and tighten it up. there is so little movement needed it will be fine.

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Re: Transmission Shift Shaft Repair
Posted by: 2manyvairs ()
Date: October 09, 2018 04:05PM

I repaired one by drilling the hole out to fit a piece of brass tubing in it. Used tubing that was the same id as the pin diameter. Can find the tubing at hobby or hardware stores - K&S is the common brand. The shaft is hardened so have a few very good drill bits of the needed size on hand.

Jeff


1960 700 sedan - blue, #1819
1962 Monza sedan - black w/red cloth interior daily driver
1962 Monza coupe - silver blue/blue 4spd
1963 Greenbrier - standard, "Turdbrier"
1963 Monza cvt - Ivy Green/Fawn It's NOT red !!
1964 Monza coupe - red/black, 95hp pg, 54k miles 3rd owner
1964 Spyder cvt - Blk/Red It's NOT red either !!
1965 Monza ht - retired daily driver, the storage shed
1965 Corsa 140 ht - all good except for how it looks.
1965 Corsa 180 cvt - well, a perfect body at least.
1966 Corsa 140 ht - Red/Red, Canadian w/factory headrests & oil bath,

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Re: Transmission Shift Shaft Repair
Posted by: steve c goodman ()
Date: October 09, 2018 04:11PM

Van I fixed one a few years ago by removing the coupler/drilling a 5/16" hole through it, welding a thin nut on each side of the coupler. I used rotary file to smooth the rough edges of the shaft. After placing coupler into shift rod and correct dimension I used a pointed end set screw through each of the nuts and the pointed ends centered into the worn holes. I used the type of set screws with square heads and I drilled each for safety wire and I blue locktited before final assembly. Car left the area a couple of years ago but was still working. The owners here used it a lot and I replaced the set screws once but easy to do. The set screws were NOT hardened so the pointed ends gradually wore. Use 5/16x24 threads too, not much to support the set screws with course threads.

So after typing this it occurred to me others probably have found easier ways so don't start on mine yet. Drilling the selector shaft is tough, the shaft is hardened at least part way through.

EDIT for afterthought: Careful driving roll pin/larger bolt etc with a hammer. Hardened shaft also means it is a brittle shaft and easier to break.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC



Edited 1 time(s). Last edit at 10/09/2018 04:15PM by steve c goodman.

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Re: Transmission Shift Shaft Repair
Posted by: caroseiii ()
Date: October 10, 2018 03:18AM

Van, I had an engineered drawing of the shifter shaft made as I was having some custom shafts made. The pin *GM part number 3827306) is 7/32 or .218". The hole size observed on an NOS selector shaft was 0.219". Both your pin and shaft are worn out of spec from the photo but you should start with a new pin from Clarks before making any decisions.

Crawford Rose

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Re: Transmission Shift Shaft Repair
Posted by: toms73novass ()
Date: October 10, 2018 04:38AM

caroseiii Wrote:
-------------------------------------------------------
> Van, I had an engineered drawing of the shifter
> shaft made as I was having some custom shafts
> made. The pin *GM part number 3827306) is 7/32 or
> .218". The hole size observed on an NOS selector
> shaft was 0.219". Both your pin and shaft are worn
> out of spec from the photo but you should start
> with a new pin from Clarks before making any
> decisions.
>
> Crawford Rose

Crawford,

Did you spec a material for the shafts? I was considering making one and was curious of the material selection.

Thanks

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
65' Monza MY Build Thread
73' NovaSS 454 Big block
86' BMW 325es
98' Dodge 2500 12v Cummins Diesel with 1200 lb torque!
98' VW Jetta TDI, for daughter
01' Audi Allroad Stage 3 twin turbo

NFCC
Grand Island, NY

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Re: Transmission Shift Shaft Repair
Posted by: caroseiii ()
Date: October 10, 2018 07:59PM

The shaft was Rockwell 35 but I don't know the steel used in the stock shaft. I used titanium in my application to save weight and avoid rust forever.
Crawford

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