m49 trans option - The 1947 - Present Chevrolet & GMC Truck Message Board Network

75gmc454 · 10-20-2007, 11:51 PM

I have searched the site, and everyone agrees that if you had the smallblock you had the 350 trans. Also I found a post about the asterisk by that option code causing a guy to wonder if that meant that even if you had a 350 motor the truck would have been equipped with the 400 trans. My cheyenne super has that asterisk by the m49 code, but the original engine and trans have been removed.

One thing I do know is that if you had the 400 trans you would have an electronic kickdown on that trans. Where on these trucks was that switch for the kickdown. On my 73 it has a switch on the accelerator for the trans. That should be a guarantee, if you find the switch you had the 400.

I would appreciate one of you guys with an original 400 trans truck letting us know where that switch was placed.

Longhorn Man · 10-21-2007, 12:14 AM

in 71 and 72, the kick down is on the throttle pedal.
I've only seen speculation that the astric means anything at all.
Many small block trucks came with the TH400. In 69 and later, the TH350 was the more common tranny of the 2 when a small block was opted, but still, there were 400's bolted to small blocks too.

**special-K** · 10-21-2007, 08:47 AM

I think in`70-back the swithch was on the carb.I had something like that on my`70.Never needed to mess with it,but I figured that was it.

chipflyer · 10-21-2007, 10:04 AM

I've seen 5 or 6 trucks that had original TH400 and the m49 option on the label with the Asterisk, but like Andy said it's only speculation on what it means. I doubt we will ever know what it really means for sure but since the 350 and 400 used the same code (m49) it is quite possible the asterisk was used to distinguish between the two.

Jeff

Longhorn Man · 10-21-2007, 11:26 AM

Tim, you are right, I didn't mention that since he is messin with a 71/72 truck.
The 70 and older trucks did in fact have the kick down switch on the carb.

75gmc454 · 10-21-2007, 11:08 PM

Thanks for all of the information. You are all right. I looked at a 70 c30 in the junkyard today, it has the kickdown switch on the carb.

GMCMAX · 10-21-2007, 11:35 PM

I just looked at pics of the label on the 69, it has the M49 with no asterisk but it is a 400 trans behind a 350, switch is on the carb.

Longhorn Man · 10-22-2007, 03:18 PM

a 69 with the switch in the cab?
You sure that's original?
I've NEVEr seen a cab mounted switch, with a rod actuated throttle.

**john** · 10-22-2007, 05:07 PM

Heres the kickdown on the carb.

Longhorn Man · 10-22-2007, 06:37 PM

DOH! I misread that... he said on the carb... I thought he said on the cab.
My fault.

10-20-2007, 11:51 PM	#1
75gmc454 Registered User Join Date: Oct 2006 Location: MS Posts: 479	m49 trans option I have searched the site, and everyone agrees that if you had the smallblock you had the 350 trans. Also I found a post about the asterisk by that option code causing a guy to wonder if that meant that even if you had a 350 motor the truck would have been equipped with the 400 trans. My cheyenne super has that asterisk by the m49 code, but the original engine and trans have been removed. One thing I do know is that if you had the 400 trans you would have an electronic kickdown on that trans. Where on these trucks was that switch for the kickdown. On my 73 it has a switch on the accelerator for the trans. That should be a guarantee, if you find the switch you had the 400. I would appreciate one of you guys with an original 400 trans truck letting us know where that switch was placed.

10-21-2007, 12:14 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: m49 trans option in 71 and 72, the kick down is on the throttle pedal. I've only seen speculation that the astric means anything at all. Many small block trucks came with the TH400. In 69 and later, the TH350 was the more common tranny of the 2 when a small block was opted, but still, there were 400's bolted to small blocks too.

10-21-2007, 08:47 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: m49 trans option I think in`70-back the swithch was on the carb.I had something like that on my`70.Never needed to mess with it,but I figured that was it. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-21-2007, 10:04 AM	#4
chipflyer Registered User Join Date: May 2004 Location: Topeka, Ks Posts: 2,293	Re: m49 trans option I've seen 5 or 6 trucks that had original TH400 and the m49 option on the label with the Asterisk, but like Andy said it's only speculation on what it means. I doubt we will ever know what it really means for sure but since the 350 and 400 used the same code (m49) it is quite possible the asterisk was used to distinguish between the two. Jeff __________________ I'm not a pessimist, I'm just optimistic that bad things are going to happen. 1971 Cheyenne Super K10 - tilt, cruise, air, am/fm, tow hooks, factory buckets! 1986 Jeep J10 pickup, - 5.3L Vortec with 4L60e and NP241.

10-21-2007, 11:26 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: m49 trans option Tim, you are right, I didn't mention that since he is messin with a 71/72 truck. The 70 and older trucks did in fact have the kick down switch on the carb.

10-21-2007, 11:08 PM	#6
75gmc454 Registered User Join Date: Oct 2006 Location: MS Posts: 479	Re: m49 trans option Thanks for all of the information. You are all right. I looked at a 70 c30 in the junkyard today, it has the kickdown switch on the carb.

10-21-2007, 11:35 PM	#7
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: m49 trans option I just looked at pics of the label on the 69, it has the M49 with no asterisk but it is a 400 trans behind a 350, switch is on the carb. __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4".

10-22-2007, 03:18 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: m49 trans option a 69 with the switch in the cab? You sure that's original? I've NEVEr seen a cab mounted switch, with a rod actuated throttle.

10-22-2007, 05:07 PM	#9
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: m49 trans option Heres the kickdown on the carb. Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

10-22-2007, 06:37 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: m49 trans option DOH! I misread that... he said on the carb... I thought he said on the cab. My fault.

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