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Username Post: 3 speed tranmission mounts        (Topic#359384)
alltak 
"11th Year" Silver Supporting Member
Posts: 227
alltak
Loc: dallas texas
Reg: 10-04-04
01-05-20 08:28 PM - Post#2783785    

Can some tell me if the powerglide and the manual transmission rubber mount is the same. Some catalogs list just one and others have both or say it is AT only. I just installed one I bought years ago. Seems a little high

Attachment: IMG_0615.JPG (3.28 MB) 11 View(s)






 


RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-05-20 09:38 PM - Post#2783788    
    In response to alltak

I'm not an expert, but the rear mount was changed in 1952. The front mount went away also and side mounts were used instead. The change in rear mount may be causing some confusion as far as a catalog is concerned. I do not own a '52 to know how it is supposed to look, but the illustration from the 1952 Engineering Features Book looks a little different from what you show. It looks as though there should be a steel collar that comes up out of the mount that the transmission should rest on. Maybe you have an aftermarket mount. Maybe someone else can shed some more light on this.

Attachment: 1952_Manual_Trans_Mount.jpeg (3.64 MB) 11 View(s)




1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
2blu52 
"18th Year" Silver Supporting Member
Posts: 19093
2blu52
Age: 86
Loc: Montana
Reg: 03-12-02
01-06-20 06:38 AM - Post#2783803    
    In response to alltak

Back in 1997 when I was redoing brakes etc on 2blu I orderd a mount from Kanter as they were the only ones selling a ready made mount. The one that came was for a Corvette and not a 3 speed. Did not look right, they replaced it for me.

"PEACE IS THAT GLORIOUS MOMENT IN HISTORY WHEN EVERY ONE STANDS AROUND RELOADING"

THOMAS JEFFERSON


 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-06-20 08:26 AM - Post#2783810    
    In response to alltak

I did a quick look through eBay but did not find any NOS examples. I did see a few old aftermarket examples and some new re re-pops. If the ones I saw had a steel collar on them, it was obviously covered with rubber during in the casting process. I might be wrong, but yours look like the rubber is being compressed. I think it was designed so that the the trans would seat on the collar and any vibration would be absorbed within the mount itself.

1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
DZAUTO 
Member #51
Posts: 8763

Loc: Mustang, OK, USA
Reg: 12-25-99
01-06-20 10:23 AM - Post#2783816    
    In response to RAM_51

I no longer use the 49-54 type transmission mounts in the 51 since I went to a V8/Muncie setup (1967).
But what I do know about the mounts for a 3sp (I do not, and never have done auto trannys!!!) is that the 49-51 share the same cross member mount setup.
The 49-51 transmission mount was as shown at the top of this discussion. The mount attached to tail housing adapter and was bolted directly to the cross member. The 49-51 transmissions DID NOT, repeat, DID NOT have boss/mount holes on the rear of the transmission case. They ONLY had adapter bolted to the rear of the transmission case as shown in the top picture.
In 1952 the change to the transmission mount was moved forward, and the 52-54 transmission cse had a boss/threaded holes for the mount.
Thus, for bone stock 49-51 transmission mounting, ANY 49-54 transmission case can be used. BUUUUUUUUUUT, for 52-54 transmission mounting, ONLY, repeat, ONLY a 52-54 case has the mount boss/holes for the rubber mount.
SURELY, SOMEONE here has pictures comparing the rear of the 3sp case for 49-51 and 52-54 transmissions.

One last comment.
If it is mandatory to retain a STOCK 49-early 53 3sp tranny, an upgrade can be done with late-53/54 guts. Also, add about a .030 shim BETWEEN the input gear and the front bearing.



 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-06-20 12:10 PM - Post#2783822    
    In response to DZAUTO

  • DZAUTO Said:
SURELY, SOMEONE here has pictures comparing the rear of the 3sp case for 49-51 and 52-54 transmissions.


All that would be needed would be a 49-51 as the image I posted is a 1952 standard transmission set-up....unless it changed somehow during production. Sometimes these GM illustrations aren't quite spot on...but I think this one represents it pretty well. Photo below is a 1952 Standard Transmission:


1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
gcrkfrd 
"2nd Year" Silver Supporting Member
Posts: 110
gcrkfrd
Age: 73
Loc: Neosho, MO.
Reg: 04-01-18
01-06-20 07:53 PM - Post#2783870    
    In response to RAM_51

My 52 Standard Rear Mount was bad, bought one from Ecklers, exactly the same as stock, and my 62 Powerglide sits right on it, like it belongs there. Think the Metal cover is to keep 70 years of grease from eating up the rubber.

52 Styleline Fourdoor 62 235 PG


 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-06-20 08:21 PM - Post#2783872    
    In response to gcrkfrd

  • gcrkfrd Said:
Think the Metal cover is to keep 70 years of grease from eating up the rubber.


I wasn't referring to the metal cover. If you look at alltak's transmission, it looks like it is "compressing rubber" between the trans and the mount...or at minimum setting on rubber. In the '52 Chevrolet illustration, however, it looks as though the transmission sits on a metal COLLAR as opposed to sitting on rubber.


1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
alltak 
"11th Year" Silver Supporting Member
Posts: 227
alltak
Loc: dallas texas
Reg: 10-04-04
01-06-20 08:26 PM - Post#2783875    
    In response to gcrkfrd

Thanks everyone for your input. This is a 54 and I believe the transmission is 53/54 also. I don't believe this mount has the steel insert that is in Ram's picture, but I may be mistaken. I have to pull the transmission again to replace the throwout bearing so I will take a better look at it.

My concern is the driveshaft angle would be a little extreme, but there is no weight on the back either.

Thanks again
Terry



 
drtyler 
"5th Year" Silver Supporting Member
Posts: 559

Loc: Georgia
Reg: 05-06-10
01-08-20 08:10 AM - Post#2783982    
    In response to RAM_51

I have a couple of NOS/NORS 52-54 standard transmission mounts (3704551) and finally dug them out of the garage this morning. The cylindrical collars that RAM points out are there and the outside portions are covered in rubber. However, the portion that the transmission rests on is NOT covered in rubber. If your mount does not have these, it may be the wrong mount.

My car has a powerglide, and I used a new mount from National Chevy Assoc. But I do not remember if it had the metal collars or not.

If you would like dimensions from one of these three-speed mounts, let me know and I'll post them.

Pictures of the mount shown below.


  • RAM_51 Said:
I did a quick look through eBay but did not find any NOS examples. I did see a few old aftermarket examples and some new re re-pops. If the ones I saw had a steel collar on them, it was obviously covered with rubber during in the casting process. I might be wrong, but yours look like the rubber is being compressed. I think it was designed so that the the trans would seat on the collar and any vibration would be absorbed within the mount itself.






 
drtyler 
"5th Year" Silver Supporting Member
Posts: 559

Loc: Georgia
Reg: 05-06-10
01-08-20 08:20 AM - Post#2783983    
    In response to drtyler



Attachment: IMG_4740.JPG (160.74 KB) 4 View(s)




Attachment: IMG_4741.JPG (138.04 KB) 2 View(s)






 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-08-20 04:16 PM - Post#2784009    
    In response to drtyler

Thanks for posting those two photos. It looks as though those two metal cylinders should seat into a piece of metal that is casted into the center of the rubber.

1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
alltak 
"11th Year" Silver Supporting Member
Posts: 227
alltak
Loc: dallas texas
Reg: 10-04-04
01-08-20 06:43 PM - Post#2784017    
    In response to RAM_51

Thanks, I am going to pull it tomorrow and take a look at it

Terry



 
DZAUTO 
Member #51
Posts: 8763

Loc: Mustang, OK, USA
Reg: 12-25-99
01-09-20 10:03 AM - Post#2784052    
    In response to alltak

You know, after taking a second look at my 51 cross member, and giving more in depth thought, I think I said everything backward above.
I guess the 49-51 (3sp) transmissions had the mount boss/holes on the rear of the transmission case and the 52-54 transmissions had the mount on the extension (which is called a bearing support (which held a brass bushing). Also, the cross member on my 51 is straight on top, whereas the 52 illustration (and probably 53-54) has a cross member that is dropped down in the center of the cross member to accommodate the transmission mount. Also, it seems that originally on my 51, there was a steel plate that bolted directly to the cross member, and the forward end of the plate is where the rubber mount attached and 2 bolts attached the rear of the transmission to the rubber mount.

Below is a picture of my 51 cross member, which as can be seen, is flat on top, not dropped down as in the illustration above.
So I guess 49-51 cross members were flat and 52-54 cross members dropped down in the center. Right? It's just been too long since I had a transmission for an enclosed driveline.



Attachment: 100_4114-1.jpg (62.76 KB) 3 View(s)






 
DZAUTO 
Member #51
Posts: 8763

Loc: Mustang, OK, USA
Reg: 12-25-99
01-09-20 10:11 AM - Post#2784053    
    In response to DZAUTO

And that mount for 52-54 pass cars APPEARS to be exactly the same mount that was used on 55-62 Corvettes with a manual transmission. That appears to be identical to the transmission mount on my 56 Vette.


Attachment: 100_0451.jpg (76.79 KB) 2 View(s)






 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-09-20 11:55 AM - Post#2784062    
    In response to DZAUTO

Then and now, backwards things get all we!

1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
DZAUTO 
Member #51
Posts: 8763

Loc: Mustang, OK, USA
Reg: 12-25-99
01-09-20 01:36 PM - Post#2784068    
    In response to RAM_51

OK Yoda.



 
alltak 
"11th Year" Silver Supporting Member
Posts: 227
alltak
Loc: dallas texas
Reg: 10-04-04
01-09-20 08:37 PM - Post#2784091    
    In response to DZAUTO

I pulled the mount and it does have the steel insert. It is just encased in the rubber.. I believe this will work just fine

Thanks for everyone's input

Attachment: IMG_0629.jpg (1.43 MB) 2 View(s)






 
RAM_51 
"3rd Year" Silver Supporting Member
Posts: 5508
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-12-20 12:18 PM - Post#2784260    
    In response to alltak

I found this 3 speed trans with mount still attached on eBay today. It has a 1953 casting date. Note that the rubber portion of the mount looks exactly like yours. I think you're good to go!



LINK:
https://www.ebay.com/itm/1949-1950-1951-19 52-1953-...

1951 Fleetline Preservation
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
alltak 
"11th Year" Silver Supporting Member
Posts: 227
alltak
Loc: dallas texas
Reg: 10-04-04
01-12-20 02:25 PM - Post#2784267    
    In response to RAM_51

Thanks Ram!



 


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