Quick Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

koolky · 12-22-2008, 06:13 PM

#1 Just bought a 72 GMC K2500, what gears would be in it, 4.57 or 4.10???
#2 I was looking up info about 2 of my 350's; one is a TBC (1970) and the power ratings come up as 255hp as expected. The second is TRK (1972) and it comes up as 175hp? Are my sources wrong or was there a power drop?
#3 I’m picking up another 350 (part of the K2500 deal) its block casting 3970010. I’ve been told its high nickel (it's got the 010) and 4 bolt mains. Thing is it’s a 2 barrel? Was this custom ordered or standard in 69 or something?

LuckyHenriksen · 12-22-2008, 06:25 PM

I would think it would have 4:10 gears

72armyswbtruck · 12-22-2008, 09:35 PM

It could be ordered in almost any gear ratio, let me look at my literature tonight and I will tell you what the options were.

koolky · 12-22-2008, 10:10 PM

Quote:

Originally Posted by 72armyswbtruck

It could be ordered in almost any gear ratio, let me look at my literature tonight and I will tell you what the options were.

I have a list of options here but it is from 1970. Also, on the chart it shows that with a 350 and SM465 there would be 4.57* gears standard, than at the bottom of the chart it says *4.10 were used on 4wd trucks with a 350 and SM465 or TurboHyadra.... So im a little confused. Lol

MotorSeven · 12-22-2008, 10:24 PM

There should be a code stamped on top of the axle, passenger side. Mine was pretty faint, but there. Clean it off & use a good shop/flash light & a mirror to find it. I am looking for the link to the codes......

RD

MotorSeven · 12-22-2008, 10:29 PM

Here ya go:

http://www.americanclassic.com/paint.htm

Oh, and it is on the axle tube between the rearend & the hub.

RD

heavy71chevy · 12-22-2008, 11:14 PM

some 350 4bolts were two barell...and some were converted later in there lives.....the 0010 block is indeed the high nickel block and a nice solid foundation to build on..prolly most likely from a truck originally

Gray Ghost · 12-22-2008, 11:24 PM

In 1971 the HP ratings changed from gross to net [basically minus the accessories]. They were also lowered by the automakers to cut insurance costs...some much more than they actually were at the flywheel.

koolky · 12-24-2008, 11:09 PM

Quote:

Originally Posted by MotorSeven

There should be a code stamped on top of the axle, passenger side. Mine was pretty faint, but there. Clean it off & use a good shop/flash light & a mirror to find it. I am looking for the link to the codes......

RD

Went out today to look for the code. I can see where it should be but it is rusted bad enough that i cant make it out... Anyone know for sure what would have come stock? 1972 GMC K2500 350 4 speed. Thanks

**CPNE** · 12-24-2008, 11:32 PM

Quote:

Originally Posted by koolky

Went out today to look for the code. I can see where it should be but it is rusted bad enough that i cant make it out... Anyone know for sure what would have come stock? 1972 GMC K2500 350 4 speed. Thanks

4:10 standard from factory with that engine and tranny. I have same setup, the 307 V8 and I6 trucks had 4:56 standard

12-22-2008, 10:24 PM	#5
MotorSeven Restoration Desperation Join Date: Aug 2006 Location: Tennessee Posts: 373	Re: Quick Questions There should be a code stamped on top of the axle, passenger side. Mine was pretty faint, but there. Clean it off & use a good shop/flash light & a mirror to find it. I am looking for the link to the codes...... RD

12-22-2008, 10:29 PM	#6
MotorSeven Restoration Desperation Join Date: Aug 2006 Location: Tennessee Posts: 373	Re: Quick Questions Here ya go: http://www.americanclassic.com/paint.htm Oh, and it is on the axle tube between the rearend & the hub. RD

12-22-2008, 11:14 PM	#7
heavy71chevy Registered User Join Date: Apr 2007 Location: antreville, south carolina Posts: 873	Re: Quick Questions some 350 4bolts were two barell...and some were converted later in there lives.....the 0010 block is indeed the high nickel block and a nice solid foundation to build on..prolly most likely from a truck originally __________________ "Dixie Destroyer" 71 C10 LWB Fleet Future Blown Prostreet Monster Last edited by heavy71chevy; 12-22-2008 at 11:16 PM.

12-22-2008, 11:24 PM	#8
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: Quick Questions In 1971 the HP ratings changed from gross to net [basically minus the accessories]. They were also lowered by the automakers to cut insurance costs...some much more than they actually were at the flywheel. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

12-22-2008, 06:13 PM	#1
koolky 67-72 Addicted Join Date: Oct 2007 Location: Guelph Ontario Posts: 256	Quick Questions #1 Just bought a 72 GMC K2500, what gears would be in it, 4.57 or 4.10??? #2 I was looking up info about 2 of my 350's; one is a TBC (1970) and the power ratings come up as 255hp as expected. The second is TRK (1972) and it comes up as 175hp? Are my sources wrong or was there a power drop? #3 I’m picking up another 350 (part of the K2500 deal) its block casting 3970010. I’ve been told its high nickel (it's got the 010) and 4 bolt mains. Thing is it’s a 2 barrel? Was this custom ordered or standard in 69 or something?

12-22-2008, 06:25 PM	#2
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: Quick Questions I would think it would have 4:10 gears __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

12-22-2008, 09:35 PM	#3
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,033	Re: Quick Questions It could be ordered in almost any gear ratio, let me look at my literature tonight and I will tell you what the options were. __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"



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