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Shifter tube stabilizer mount
Posted by: Coho Cliff ()
Date: October 31, 2017 04:05PM

Working on transplanting a 4 speed into my 66 Monza. The mount on the shifter tube apparently broke loose years ago and was brazed back in place, but was broken loose again when I got my donor car. I've clean all the brazing off and will MIG weld the bracket back on the tube, but I don't know the distance. I've temporarily located it at what appeared to be where the brazing held it, about 5/8 inch from the end of the tube. Can anyone verify this as "close enough?" Better yet, if you've got an actual measurement from a good tube, I'd appreciate that very much.

Thanks

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Re: Shifter tube stabilizer mount
Posted by: flat_six ()
Date: October 31, 2017 04:13PM

Funny, I just finished a series of posts here dealing with these same parts. The reason I needed them is that the bracket you describe here broke off and a PO removed the rod and brackets from the car.

I had never seen that before. Hard to imagine that the forces on that bracket would be that large, so I was assuming that it rusted or got hit. Than came your post.

So here is a question to the greater group: how often have you seen the brazed bracket at the back of the shift tube broken? Is it caused by solid shift couplers and/or bushings?

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Re: Shifter tube stabilizer mount
Posted by: Coho Cliff ()
Date: October 31, 2017 04:14PM

Forgot to resize photo. This is what it looks like now.

Attachments:
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Re: Shifter tube stabilizer mount
Posted by: flat_six ()
Date: October 31, 2017 04:19PM

Hopefully someone will get you a measurement. If not I will get that after I get home.

Just know that the far rear bracket has elongated holes in it so there is a lot of fore-aft adjustability. Close enough should be fine.

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Re: Shifter tube stabilizer mount
Posted by: steve c goodman ()
Date: October 31, 2017 04:20PM

I just measured one here at the shop, it is 25/32" in the manner you are holding your scale in your pic.

Yes I see them broken occasionally, I always chalk it up to
the roads we have around here. Lots of holes/rough areas.
Since the suspension and powertrain are tied together
everything is moving. Hope this helps.

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

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Re: Shifter tube stabilizer mount
Posted by: flat_six ()
Date: October 31, 2017 04:25PM

steve c goodman Wrote:

>
> Yes I see them broken occasionally, I always chalk
> it up to
> the roads we have around here. Lots of
> holes/rough areas.
> Since the suspension and powertrain are tied
> together
> everything is moving.


Do you see them actually broken (like mine) or just the braze joint failed?

I wonder if it has anything to do with worn synchros. Grinding when changing gears and more force applied to the shifter.



Edited 1 time(s). Last edit at 10/31/2017 04:26PM by flat_six.

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Re: Shifter tube stabilizer mount
Posted by: steve c goodman ()
Date: October 31, 2017 04:41PM

How did yours break? I just assumed the weld broke.
I doubt worn brass would put pressure on the tube.

Maybe some worn mounts allow the powertrain to shift
constantly and 'work' the weld joint. well maybe??

Maybe badly aligned shift tube to coupler placing a
lot of pressure/strain on the bracket. another maybe

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

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Re: Shifter tube stabilizer mount
Posted by: gregb ()
Date: October 31, 2017 05:00PM

Mine was broken off on my 65 and the stabilizer bar was gone. I have since replaced it with another one with a good bracket.

Gregb

Alberta Canada
61 Canadian Lakewood
62 Spyder Triple Black Convertible
65 Corsa Coupe

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Re: Shifter tube stabilizer mount
Posted by: flat_six ()
Date: October 31, 2017 05:08PM

If you can see in the picture, it would appear that my bracket just plain broke right through the bracket or weld. That's what has me baffled, since its a pretty thick piece of steel.





Edited 2 time(s). Last edit at 10/31/2017 05:13PM by flat_six.

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Re: Shifter tube stabilizer mount
Posted by: steve c goodman ()
Date: October 31, 2017 05:26PM

That is typically where they break. Granted the bracket piece
is thick but the tube is pretty thin wall.

EDIT to suggest a lot of heat applied to bracket
while brazing and the metal is softened. ONLY GUESSING

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 10/31/2017 05:28PM by steve c goodman.

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Re: Shifter tube stabilizer mount
Posted by: Coho Cliff ()
Date: October 31, 2017 06:35PM

I assumed that the bracket on my donor car had been originally factory welded and that the brazing was done as a repair. Were these brazed originally or welded? By the way, thanks to Steve for the measurement.

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Re: Shifter tube stabilizer mount
Posted by: cnicol ()
Date: October 31, 2017 08:35PM

About this part breaking... I'm going to guess the shifter base was not correctly shimmed (too tight to floor) so the shifter base could not slide with powertrain movement. Caught between a rock and a hard place, the bracket couldn't take the cycling pressure of powertrain moving around in its rubber mounts.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Shifter tube stabilizer mount
Posted by: flat_six ()
Date: November 01, 2017 08:00AM

cnicol Wrote:
-------------------------------------------------------
> About this part breaking... I'm going to guess
> the shifter base was not correctly shimmed (too
> tight to floor) so the shifter base could not
> slide with powertrain movement. Caught between a
> rock and a hard place, the bracket couldn't take
> the cycling pressure of powertrain moving around
> in its rubber mounts.


Craig you probably nailed it. Either too tight or not centered in its travel. If the drive train moves and the shift base "bottoms out" in the floor, huge forces would be transmitted through that bracket.

I will have to make sure I pay attention to the shop manual procedure when installing the new one...

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Re: Shifter tube stabilizer mount
Posted by: Allan Lacki ()
Date: November 01, 2017 10:26AM

I agree with Craig. Also, I believe the factory brazed those pieces together.

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Re: Shifter tube stabilizer mount
Posted by: corventure Dave ()
Date: November 02, 2017 02:02PM

I think you've nailed it. However, when brazing two steel parts together, both metal parts have to be heated the same. Thick metal to thin tubing is more challenging. But if they re not heated and braze welded properly, the weld will eventually break away. Looks to me like the factory worker was in a hurry!

One of the test's I did years ago when learning to gas weld, was to join two pieces of different thickness metal together. To pass the weld test, the two parts were torn apart. The parent metal had to tear away. Not the brazing weld.

Corventure Dave

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