![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Help identifying transmission
Here try this...
What the #%$$%$ kind of transmission is this. It's on CL, and the guy just know its from a 292. Is is a granny 4 speed? http://orlando.craigslist.org/pts/1811919813.html
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. Last edited by FL71C10; 06-26-2010 at 11:09 AM. |
![]() |
![]() |
![]() |
#2 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
|
Re: Help identifying transmission
Tried the link, but it said it was removed.
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
![]() |
![]() |
![]() |
#3 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
I fixed the link
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#4 |
Senior Member
![]() Join Date: Apr 2000
Location: madison indiana
Posts: 3,839
|
Re: Help identifying transmission
granny 4 speed.
__________________
jamie72 72 BB cheyenne -- Restoration getting started.. member #807 http://www.myspace.com/whitetailobsession www.antlertalk.com |
![]() |
![]() |
![]() |
#5 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
|
Re: Help identifying transmission
Yep, that is a granny 4 speed. I have a '67 and a '71. I almost had a '64, but my son sold the truck before I could get the transmisson out of it.
They are great transmissons, don't like a lot of hot rodding or speed shifting. I can put mine in granny low and walk along beside the truck when it is idling. I have heard stories from old farmers that they use to do just that in the fields. They would tie the steering wheel, put the truck in low and walk beside them while loading stuff in the bed of the truck or on a towed trailer.
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
|
Re: Help identifying transmission
def. granny 4 speed id say the sm420 looks just like it heres a sm 420 pic
|
![]() |
![]() |
![]() |
#7 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
Thanks, it looks so short! Would that be a bolt on replacement for my 6 cyl 3 speed?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
The transmission will bolt to a 3 speed bellhousing, but you will need a different driveshaft. Also, 68-up transmissions (either 3 or 4 speed) have a larger front bearing retainer than 67-earlier. Don't worry about this if the seller will let you have the bellhousing shown in his pics, because then you know it will fit.
Ray |
![]() |
![]() |
![]() |
#9 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
Is $100 a decent price. He said it includes the shifter. What should I check for?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
$100 isn't a bad price if the transmission is in good condition. These boxes don't break easily, but they can get loose and noisy after a lot of use. If the seller will permit, take off the cover and look for obvious damage like corrosion or broken teeth. Whether you look inside or not, shift it into any forward gear except 4th and feel for excessive free play between the input and output shafts. When you put it in 4th it should have almost no free play at all.
That is an SM420, which means the smaller size bearing retainer, so be sure to get the bellhousing if you buy it. Ray Last edited by raycow; 06-28-2010 at 03:47 AM. |
![]() |
![]() |
![]() |
#11 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,521
|
Re: Help identifying transmission
-
Here is a pic of the different transmissions... Quote:
http://dennymac.com/mod.php?mod=user...103&page_id=54 and use his existing bell housing. At the time I bought the ring for mine it was $28 shipped. There is also some good swap info there... LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 06-28-2010 at 10:37 AM. |
|
![]() |
![]() |
![]() |
#12 | |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
|
Re: Help identifying transmission
Quote:
We bolted a SM420 to a '69 bell housing I think and it seemed to fit ok. When I drive the truck everything seems ok. I guess my question is will this be a problem in the future?
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
|
![]() |
![]() |
![]() |
#13 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
Quote:
If you haven't noticed any problems yet, you may be in luck. Remove the transmission, install a spacer ring, and reassemble it. No other changes are necessary. Ray |
|
![]() |
![]() |
![]() |
#14 | |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
|
Re: Help identifying transmission
Quote:
I have the original '67 bell housing, so I will use it when I pull the transmission to check the clutch assembly. This truck is not a daily driver and will be the one I am going to do a pretty thorough restoration. I just added to my restoration notes to change the bell housing. Again thank you for your help.
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
|
![]() |
![]() |
![]() |
#15 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
The sm420 I am looking at is out of a 66 Chevy camper special (allegedly). Will it have synchromesh in all gears? Why won't my old driveshaft from the 3 speed work, because of the length or the yoke? Lastly, will my speedo cable screw right in and work (I know the speed may be off due to gearing changes).
Thanks!
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#16 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
|
Re: Help identifying transmission
My '67 has synchromesh in all forward gears except 1st or granny low as some people call it, so shoud yours.
The speed-o-meter should not be off because of different gearing from a 3 speed to 4 speed. Normally what causes the speed-o-meter to be off is tire size. I would have to look at both transmissions, but I think the 3 speed is longer than the 4 speed requiring drive shaft mods. If they are the same length the driveshaft should be ok, I would think.
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
![]() |
![]() |
![]() |
#17 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
I guess you don't want to be shifting into 1st while you're moving anyway.
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
3 and 4 speed driveshafts are different in design as well as length. The 3 speed shaft has a slip yoke on the front end that slides on the transmission output shaft. This is the same arrangement as on most automatics.
The 4 speed transmission has a flange which is bolted solidly to the output shaft and cannot move endwise. The front U-joint bolts to this flange and there is a slip joint in the shaft behind the U-joint. Ray |
![]() |
![]() |
![]() |
#19 | |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
Quote:
Will an SM465 fit in my truck as well?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
|
![]() |
![]() |
![]() |
#20 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
anybody know about this?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
|
![]() |
![]() |
![]() |
#22 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
OK, so I have my 68 250 with the three speed. The sm465 I am looking at has no bellhousing and came out of a 73 truck. Will the sm 465 bolt up to the 68 bellhousing or do I need to get a different bellhousing?
Sorry to be so slow. Here are pics of the transmission. Thanks!
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#23 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
Quote:
Ray |
|
![]() |
![]() |
![]() |
#24 |
Senior Member
![]() Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
|
Re: Help identifying transmission
The engine and trans are out of a 68. Do I need a high hump transmission tunnel with the sm475?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
![]() |
![]() |
![]() |
#25 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
|
Re: Help identifying transmission
|
![]() |
![]() |
![]() |
Bookmarks |
|
|