PDA

View Full Version : Trans for V12


sandersmills
February 7th, 2013, 04:51 PM
Hey all,

I am looking for a trans for my V12. It came out of a COE. It has the clutch and bell-housing still on it. I just need the trans that bolts up to it. (SAE2 ?) Any help would be great!! I just want the manual trans, nothing fancy.

Bob Sanders
Castalia, NC
252-326-0493

FetchMeAPepsi
February 7th, 2013, 10:17 PM
Do they use the same trans as a regular v6?

bigblockv6
February 7th, 2013, 11:20 PM
It's possible that the 702ci V12 may used the same transmission in the B and L series that the larger 401 and 478 engines did but we're talking big truck stuff here like Clark and Fuller 5 speeds that dwarf the SM-420 that's in pickup trucks. Pete Chronis Northern Cal.

sandersmills
February 7th, 2013, 11:37 PM
No, they are much bigger.

BillT
February 8th, 2013, 05:16 AM
I never owned one or even driven one, but I believe that most if not all were either straight 5's or 5 and 2's (5-Speed Trans, 2-Speed Rears).

I believe my '62 6500 had a Clark in it. I can remember going through the owners manual and saw where there was an optional Fuller R-46 8-Speed Road Ranger available. Not sure if the 702 also had that option, but that early style trans was known as not the best trans ever built.

Jolly's old site may have engine to trans combinations over there.

Bill

6066gmcguy
February 8th, 2013, 02:11 PM
I would help to post a photo, this is what he is more likely working with.

sandersmills
February 8th, 2013, 07:24 PM
Well, this is what it looks like. I just need the trans. I have everything else. It should be for an SAE2 mount.
Bob

http://insurrection-guild.com/sanmills/pics/V12_04.JPG
http://insurrection-guild.com/sanmills/pics/V12_06.JPG

sandersmills
February 8th, 2013, 08:00 PM
Top bolts c to c is 11 7/8”

Bottom 12 7/8”

up and down 6 5/8”

10 Spline

That is a three cell Maglite.

Bob

http://insurrection-guild.com/sanmills/pics/V12trans.JPG

6066gmcguy
February 8th, 2013, 11:34 PM
I was told the picture I posted was a SAE 2, that why I posted it. if you look at your bellhousing it is the same, I can see the round part, its got an adaptor of soem king on it too.

sandersmills
February 9th, 2013, 02:09 AM
You are right that looks like the SAE2. (thanks) What I need, I believe, is the Clark 407V or a Clark 408V trans that will bolt to this. I was told that came on a model L-7000.

Maybe a better look at this.

http://insurrection-guild.com/sanmills/pics/V12_011.JPG

BillT
February 9th, 2013, 03:04 AM
Not sure what Clark I had in my truck. I believe it can be figured out though by charts I have seen online, but 4th Gear and 5th Gear were pretty close to each other.

It actually changed the shift pattern when split shifting with the 2-Speed Rear.

The pattern was:

1L
1H
2L
2H
3L
3H
4L
5L
4H
5H

If you are using a straight 5 without a 2-Speed Rear, you may not want to use this trans.

Bill

sandersmills
February 10th, 2013, 01:06 PM
If someone has a complete transmission that would fit on this thing, that would be great also. I am not picky about what I am using, I just need something. Thanks for all the info so far.

turbobill
February 10th, 2013, 05:27 PM
My 478 came with a Clark 305VO 5 speed. I'm pretty sure the bellhousing is the SAE #2.

sandersmills
February 14th, 2013, 04:25 PM
anyone have an complete SAE 2 tranny that they will part with? :)

sandersmills
April 2nd, 2013, 12:41 AM
Still need trans.....I hope someone has something that will work. Anything that will fit!! Or may know someone.........Thanks to all so far.;)

FetchMeAPepsi
April 2nd, 2013, 02:14 AM
CoyoteRun has a V12 and might have some info on transmissions in his area. You might try emailing some people on Ebay that sold the V12s. Ive seen a couple come through in the past couple of months. Check out this guy http://www.ebay.com/itm/5-Complete-GMC-502-V12-Gas-Engines-extra-parts-/271177398195?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f236eb7b3&vxp=mtr

Cayoterun
May 4th, 2013, 04:01 AM
CoyoteRun has a V12 and might have some info on transmissions in his area. You might try emailing some people on Ebay that sold the V12s. Ive seen a couple come through in the past couple of months. Check out this guy http://www.ebay.com/itm/5-Complete-GMC-502-V12-Gas-Engines-extra-parts-/271177398195?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f236eb7b3&vxp=mtr

I sent a pm just now with a link to a classified in Great Bend, Ks. It looked like it might be close to what you need.
It's a long ways from you, but the V-12 stuff is hard to find anymore.

I used custom adapters to mate a 700R4 auto. Pricey, but works nice.

Good Luck

sandersmills
November 5th, 2014, 12:49 AM
I guess I don't need a trans any more.........thanks to all that tried