The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-24-2009, 09:50 PM   #1
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
3-Speed question

I got a question concerning the early 3-speed transmissions and their bolt patterns.

The bell housing on my '60 has provisions for 5 bolt holes but the tranny (SM-318) only has 4 bolts. Now, I've seen 3-speeds with five bolt holes.

The question is what trucks did the 5 bolt pattern tranny's come in and what trucks did the 4 bolt pattern come in?

I'll try and find some pics....
Corts60 is offline   Reply With Quote
Old 09-24-2009, 10:00 PM   #2
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

here is my tranny with the 4 bolt hole pattern like most that I have seen

And I take that back, I don't have the 5 bolt bellhousing:

Last edited by Corts60; 09-24-2009 at 10:02 PM.
Corts60 is offline   Reply With Quote
Old 09-25-2009, 09:13 PM   #3
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

Anyone? Bueller?
Corts60 is offline   Reply With Quote
Old 09-26-2009, 01:01 AM   #4
markeb01
Senior Enthusiast
 
markeb01's Avatar
 
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
Re: 3-Speed question

I'm assuming you mean the mounting holes. Does the 5 hole transmission have 5 mounting ears? I'm curious where the 5th holes is located.

Most 3 speeds I've seen look like the one you pictured, except perhaps with a shorter or longer tailshaft. The only exception was pre-55 trans with a torque tube which had a smaller and narrower pattern. Do you know for sure if the 5 hole transmissions were a GM product?
markeb01 is offline   Reply With Quote
Old 09-26-2009, 11:33 AM   #5
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

Quote:
Originally Posted by markeb01 View Post
I'm assuming you mean the mounting holes. Does the 5 hole transmission have 5 mounting ears? I'm curious where the 5th holes is located.

Most 3 speeds I've seen look like the one you pictured, except perhaps with a shorter or longer tailshaft. The only exception was pre-55 trans with a torque tube which had a smaller and narrower pattern. Do you know for sure if the 5 hole transmissions were a GM product?
No I'm not sure it was GM.....but yes it has 5 mounting ears, sorry if I wasn't specific earlier. I'm still trying to find the picture.
Corts60 is offline   Reply With Quote
Old 09-26-2009, 11:52 AM   #6
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

Here's the pictures:



Maybe these came in the big trucks?
Corts60 is offline   Reply With Quote
Old 09-26-2009, 11:14 PM   #7
markeb01
Senior Enthusiast
 
markeb01's Avatar
 
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
Re: 3-Speed question

Wow that looks like the biggest 3 speed ever. The gearset must be huge. The side cover looks twice as big as anything I've seen. I think you're probably right about it coming from a big truck. It seems older with what appears to be a 10 spline pilot shaft. Of course when's the last time anybody made a 3 speed manual.

I'm curious now and going to do some more research. If you figure out what this is please post the results.
markeb01 is offline   Reply With Quote
Old 09-26-2009, 11:19 PM   #8
markeb01
Senior Enthusiast
 
markeb01's Avatar
 
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
Re: 3-Speed question

Looks like it is a heavy duty GM Saginaw transmission per the following weblink:

http://columbus.craigslist.org/bar/1384236089.html
markeb01 is offline   Reply With Quote
Old 09-27-2009, 12:12 AM   #9
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

Well, that's awesome! Thanks Mark.

Now I wonder what bellhousing goes with it?
Corts60 is offline   Reply With Quote
Old 09-27-2009, 12:39 AM   #10
protrash64
Resistance is Futile
 
protrash64's Avatar
 
Join Date: Dec 2006
Location: Mesa,Arizona
Posts: 3,520
Re: 3-Speed question

Quote:
Originally Posted by Corts60 View Post
Well, that's awesome! Thanks Mark.

Now I wonder what bellhousing goes with it?
Do you think it would fit on your bellhousing and just skip the upper bolt?
__________________
64 CHEVY PICK-UP > http://67-72chevytrucks.com/vboard/s...otrash+re-hash
64 CARRYALL >http://67-72chevytrucks.com/vboard/s...=1964+suburban
66 LB >http://67-72chevytrucks.com/vboard/s...d.php?t=427852
STRENGTH/DETERMINATION/MERCILESS/FOREVER
.......posted via stationary device
protrash64 is offline   Reply With Quote
Old 09-27-2009, 10:39 AM   #11
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
Re: 3-Speed question

Quote:
Originally Posted by protrash64 View Post
Do you think it would fit on your bellhousing and just skip the upper bolt?
It would probably bolt up, but I think they have that extra ear for the weight since there is no tranny mount on my year of truck. So it has to be an early style tranny when engines still had "rear engine" mounts instead of tranny mounts.
Corts60 is offline   Reply With Quote
Old 09-28-2009, 10:17 AM   #12
MikeN
Registered User
 
MikeN's Avatar
 
Join Date: Oct 2007
Location: Marietta, GA
Posts: 805
Re: 3-Speed question

I use a heavy duty, all-synchro Muncie 3-speed in my 64 C10. It is just as large/heavy as the transmission in lower photograph, and it works just fine with that type of bellhousing and no rear mount. I have never seen a transmission with that 5th mounting hole up top though.
MikeN is offline   Reply With Quote
Old 09-28-2009, 02:18 PM   #13
markeb01
Senior Enthusiast
 
markeb01's Avatar
 
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
Re: 3-Speed question

Come to think of it, my 1960 GMC had the granny 4 speed installed when I bought it, and it only had the standard 4 ear bolt pattern with no tail mount. It seemed that thing weighed as much as a small car engine, so I would imagine it would be okay to ignore the upper bolt on the heavy duty 3 speed.

It would be interesting to come up with a 5 hole bellhousing however, just to confirm one can be found.
markeb01 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:39 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com