Gear Numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VDOG · 04-16-2007, 08:15 PM

When I opened my 12 bolt, it had about a pint of gear oil in there.
There were some numbers on the ring X 3817779 14:43 CM 4-69 2

Dose anyone know what that means?

Blue85 · 04-16-2007, 08:24 PM

3817779 is the part number, 14:43means 3.08 gears, i'm guessing the 4-69 is a date code

Bus Ted Knuckle · 04-16-2007, 08:48 PM

14:43 is 3.07 gears. Blue is correct on everything else

Goodguytrucks · 04-17-2007, 01:21 AM

If it has springs inside also ....Does it mean it is a posi?

Robznob11 · 04-17-2007, 09:34 AM

yup

Goodguytrucks · 04-17-2007, 12:07 PM

I didn't know if it was just some limited slip or posi....Well that is good cause that is what is going in my truck then

Tx Firefighter · 04-17-2007, 01:09 PM

Your center pin retaining bolt is either broke or missing.

sneakysnake · 04-17-2007, 01:17 PM

Quote:

Originally Posted by Tx Firefighter

Your center pin retaining bolt is either broke or missing.

Good eye.

VDOG · 04-17-2007, 01:48 PM

Quote:

Originally Posted by Tx Firefighter

Your center pin retaining bolt is either broke or missing.

Yes it is broke. I found that out when I was removing it to take the center pin out. Half of it unscrewed, and other half is still in the hole. Was told to beat it out, but thats not working, so I have to get an Easy Out to remove it.

RACINJASON22 · 04-17-2007, 02:06 PM

Good LUCK with that one! It has happen to me and it can be a real PITA specially after you have tried to beat the cross pin out. It can be done though I got it in the end.

VDOG · 04-18-2007, 02:43 PM

Quote:

Originally Posted by RACINJASON22

Good LUCK with that one! It has happen to me and it can be a real PITA specially after you have tried to beat the cross pin out. It can be done though I got it in the end.

I think 2 days of beating is enough. Time for a new plan.

VDOG · 04-20-2007, 04:19 PM

3:08's, I think I might as well change those also. With this 283 in my truck, im going to need all the help I can get. Do you guys think 3:55's or 3:73's will be better?

Longhorn Man · 04-20-2007, 05:36 PM

well, if you spend much time on the freeway, you'd be best off with those 3.07 gears. (the 3.08 was a car gear, 3.07 was for trucks)

**SactoJim** · 04-20-2007, 05:36 PM

Definately get better gears. That little 283 doesn't have much torque. Go with 3.73''s.

VDOG · 04-20-2007, 06:16 PM

Dont spend a lot of time on the freeway and besides in Los Angeles, your not going to fast because of traffic. Will 3:73 let me drive the freeway and give me some added torque?

Longhorn Man · 04-20-2007, 06:23 PM

well, there is another way of looking at this...
the 3.07 is already there. Get your truck on the road now, spend money where it needs to be spent to get you rolling... THEN... if you aren't happy with it... THEN, locate you a 3.73 axle. Your 3.07 is in higher demand for the freeway cruisers, so it'll be easy to sell.
And... we both know, LA isn't ALWAYS grid lock. otherwise, we'd never get the cool videos from the chopper on the scarey police video shows.

VDOG · 04-20-2007, 06:29 PM

Yes we do have a lot of high speed chases here,..even in traffic.
Not a bad idea, now I have to research which trucks came with 3:73 gears.
I did pull 3:55's (I think thats what they were) from a 6 cyl 68 or 69 C10.
Cant remember and instead of taking the whole rear end. wheels and all, I took out the ring and gears and could not get the pinion out. I hear you dont mix one ring to another pinion. Unless one of you have tried it with no problem.

mnunn454 · 04-20-2007, 06:46 PM

If you change gearing above 3.42, you'll need a different carrier all together. Personally, I'd leave it at 3.07 and [assuming you have an automatic] if you want more pick-em-up in your pick-em-up, get a higher stall converter.

Longhorn Man · 04-20-2007, 06:56 PM

personally, screw setting up gears... esp if you are dealing with old used stuff. I'd just swap the whole rear.
3.73 gears would be in most 3 speed manual trucks, both inline, and small block.
#.73, 3.07, an ocasional 4.10, and I think some big block 3.42 gear sets is all you'll find in a stock 1/2 ton axle. (not sure on the 3.42.. .that may only be in the 3/4 ton and one ton trucks)

GREASEMONKEY72 · 04-21-2007, 04:13 AM

personally id stick with the 3.07's, better mpg city or freeway, but if you do change i wouldnt go any lower then 3.73's and go with a whole rearend and not just the gears, then you know the splines are right and everything

GREASEMONKEY72 · 04-21-2007, 04:15 AM

IIRC, you can pull a rearend out of a newer truck or suv and get the 3.73's and rear disc brakes if you want

**special-K** · 04-21-2007, 08:47 AM

I have a 3.42 posi unit for a 12-bolt.

*alschevy* · 04-21-2007, 11:10 PM

ok my 1967 chevy one ton tow the guy that i got my tow truck from when he got it the rear gear was a 538 and engine was a 250 six than the gear was a diffent one add it 456 now i have a 411 gear in it and my enging is a 305 but i will puting in a 292 six than later a 327 or 396

AuggieStyle · 04-21-2007, 11:34 PM

Is there a formula to help decipher the code on the rear end to help find the gear ratio?
How does 14:43=3.07?

Longhorn Man · 04-21-2007, 11:41 PM

Quote:

Originally Posted by GREASEMONKEY72

IIRC, you can pull a rearend out of a newer truck or suv and get the 3.73's and rear disc brakes if you want

You can do it, but then you have to fab up the panhard bar mount, and weld on new mounts for the trailing arms.
Disk brakes in the back of a truck is a total waste of money unless you constantly have a lot of weight in it.

Quote:

Originally Posted by alschevy

ok my 1967 chevy one ton tow the guy that i got my tow truck from when he got it the rear gear was a 538 and engine was a 250 six than the gear was a diffent one add it 456 now i have a 411 gear in it and my enging is a 305 but i will puting in a 292 six than later a 327 or 396

none of that matters, we are talking 1/2 ton stuff, those gears were for the heavy trucks, not the light duty stuff.

Quote:

Originally Posted by AuggieStyle

Is there a formula to help decipher the code on the rear end to help find the gear ratio?
How does 14:43=3.07?

Yes there is... divide 43 into 14, and you'll get 3.071428571... or 3.07.

04-16-2007, 08:15 PM	#1
VDOG Grand PooBaa Member Join Date: Jan 2001 Location: LA, CA Posts: 5,302	Gear Numbers When I opened my 12 bolt, it had about a pint of gear oil in there. There were some numbers on the ring X 3817779 14:43 CM 4-69 2 Dose anyone know what that means? Attached Images

04-16-2007, 08:24 PM	#2
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Gear Numbers 3817779 is the part number, 14:43means 3.08 gears, i'm guessing the 4-69 is a date code __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

04-16-2007, 08:48 PM	#3
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: Gear Numbers 14:43 is 3.07 gears. Blue is correct on everything else __________________ Bill BEATERS ARE NEATER

04-17-2007, 01:21 AM	#4
Goodguytrucks Registered User Join Date: Dec 2004 Location: Boyle, Alberta, Canada Posts: 126	Re: Gear Numbers If it has springs inside also ....Does it mean it is a posi?

04-17-2007, 09:34 AM	#5
Robznob11 Registered User Join Date: Feb 2004 Location: brownfield texas (west texas) Posts: 1,936	Re: Gear Numbers yup __________________ The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS

04-17-2007, 12:07 PM	#6
Goodguytrucks Registered User Join Date: Dec 2004 Location: Boyle, Alberta, Canada Posts: 126	Re: Gear Numbers I didn't know if it was just some limited slip or posi....Well that is good cause that is what is going in my truck then

04-17-2007, 01:09 PM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Gear Numbers Your center pin retaining bolt is either broke or missing. __________________ I'm on the Instagram- @Gearhead_Kevin

04-17-2007, 02:06 PM	#10
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Gear Numbers Good LUCK with that one! It has happen to me and it can be a real PITA specially after you have tried to beat the cross pin out. It can be done though I got it in the end. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

04-20-2007, 04:19 PM	#12
VDOG Grand PooBaa Member Join Date: Jan 2001 Location: LA, CA Posts: 5,302	Re: Gear Numbers 3:08's, I think I might as well change those also. With this 283 in my truck, im going to need all the help I can get. Do you guys think 3:55's or 3:73's will be better?

04-20-2007, 05:36 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Gear Numbers well, if you spend much time on the freeway, you'd be best off with those 3.07 gears. (the 3.08 was a car gear, 3.07 was for trucks)

04-20-2007, 05:36 PM	#14
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	Re: Gear Numbers Definately get better gears. That little 283 doesn't have much torque. Go with 3.73''s. __________________ 72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - My Build Thread

04-20-2007, 06:16 PM	#15
VDOG Grand PooBaa Member Join Date: Jan 2001 Location: LA, CA Posts: 5,302	Re: Gear Numbers Dont spend a lot of time on the freeway and besides in Los Angeles, your not going to fast because of traffic. Will 3:73 let me drive the freeway and give me some added torque?

04-20-2007, 06:23 PM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Gear Numbers well, there is another way of looking at this... the 3.07 is already there. Get your truck on the road now, spend money where it needs to be spent to get you rolling... THEN... if you aren't happy with it... THEN, locate you a 3.73 axle. Your 3.07 is in higher demand for the freeway cruisers, so it'll be easy to sell. And... we both know, LA isn't ALWAYS grid lock. otherwise, we'd never get the cool videos from the chopper on the scarey police video shows.

04-20-2007, 06:29 PM	#17
VDOG Grand PooBaa Member Join Date: Jan 2001 Location: LA, CA Posts: 5,302	Re: Gear Numbers Yes we do have a lot of high speed chases here,..even in traffic. Not a bad idea, now I have to research which trucks came with 3:73 gears. I did pull 3:55's (I think thats what they were) from a 6 cyl 68 or 69 C10. Cant remember and instead of taking the whole rear end. wheels and all, I took out the ring and gears and could not get the pinion out. I hear you dont mix one ring to another pinion. Unless one of you have tried it with no problem.

04-20-2007, 06:46 PM	#18
mnunn454 Registered User Join Date: Dec 2006 Location: Rhode Island Posts: 602	Re: Gear Numbers If you change gearing above 3.42, you'll need a different carrier all together. Personally, I'd leave it at 3.07 and [assuming you have an automatic] if you want more pick-em-up in your pick-em-up, get a higher stall converter. __________________ 69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe Last edited by mnunn454; 04-20-2007 at 06:48 PM.



Register or Log In To remove these advertisements.

04-20-2007, 06:56 PM	#19
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Gear Numbers personally, screw setting up gears... esp if you are dealing with old used stuff. I'd just swap the whole rear. 3.73 gears would be in most 3 speed manual trucks, both inline, and small block. #.73, 3.07, an ocasional 4.10, and I think some big block 3.42 gear sets is all you'll find in a stock 1/2 ton axle. (not sure on the 3.42.. .that may only be in the 3/4 ton and one ton trucks)

04-21-2007, 04:13 AM	#20
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: Gear Numbers personally id stick with the 3.07's, better mpg city or freeway, but if you do change i wouldnt go any lower then 3.73's and go with a whole rearend and not just the gears, then you know the splines are right and everything __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

04-21-2007, 04:15 AM	#21
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: Gear Numbers IIRC, you can pull a rearend out of a newer truck or suv and get the 3.73's and rear disc brakes if you want __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

04-21-2007, 08:47 AM	#22
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Gear Numbers I have a 3.42 posi unit for a 12-bolt. __________________ "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 ~

04-21-2007, 11:10 PM	#23
alschevy Account Suspended Join Date: Jun 2005 Location: Lehigh Acres FL Posts: 205	Re: Gear Numbers ok my 1967 chevy one ton tow the guy that i got my tow truck from when he got it the rear gear was a 538 and engine was a 250 six than the gear was a diffent one add it 456 now i have a 411 gear in it and my enging is a 305 but i will puting in a 292 six than later a 327 or 396

04-21-2007, 11:34 PM	#24
AuggieStyle Registered User Join Date: Apr 2007 Location: Dallas,TX. Posts: 499	Re: Gear Numbers Is there a formula to help decipher the code on the rear end to help find the gear ratio? How does 14:43=3.07?

Register or Log In To remove these advertisements.