![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
|
3:07 and 3:08 what is the diff????
What year was stock in 67? 08's or 07's?
What came with what trucks c/10 c/20 Do they use the same carrier? Any links or tips would be great! Some people are asking for 3:07's While I thought it was 3:08's for 67-72?? ![]()
__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
|
For all intents and purposes they are the same thing.
__________________
Tim |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
|
As crazy as this sounds I was told that 3.07 went into trucks and 3.08s went into cars.
__________________
RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
![]() |
![]() |
![]() |
#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
67 - 72 C/10 could be had with a 3.07...C/20 had nothing even close.
While in all reality, they are pretty mucvh the same...but the trucks never had 3.08 stock...not 67 - 72 anyways. |
![]() |
![]() |
![]() |
#5 |
Seņor Member
Join Date: May 2002
Location: Edge of the world
Posts: 5,367
|
.01?
__________________
|
![]() |
![]() |
![]() |
#6 | |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
|
Quote:
__________________
Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
|
![]() |
![]() |
![]() |
#7 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
|
Yeah its a car ratio being 3.08 to truck being 3.07. just a rounding off of the division.....you also get confusion with the dana truck compared to eaton/ corp truck ratio.....rounding them off you get dana being 4.56 and corp/eaton being 4.57.
dana having gear counts of 41/9= 4.55555 or 4.56 corp having gears of 32/7 = 4.571428 or 4.57
__________________
Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
![]() |
![]() |
![]() |
#8 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
|
i always refered to them as 3.08's until i counted the ring and pinion on my old gears and divided it and got 3.07 .....either way the general point gets across .... highway gears
![]()
__________________
71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
|
Thanks for the posts. That is great.
Do they use the same carrier then? Or is it safer to get the gears and carrier from the same rear end?
__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
![]() |
![]() |
![]() |
#10 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,770
|
Yeah, my Z28 has 3.08 gears from the factory. Not for long though, as soon as I can get the 3.42 posi I have detailed it's going in it's place.
__________________
70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
![]() |
![]() |
![]() |
#11 |
Account Suspended
Join Date: Feb 2005
Location: Yoncalla Oregon
Posts: 775
|
I used to have a '61 Ferd 3/4 ton 4x4 it had a Ford rearend w/4.10s and a Dana 44 with 4.09s. Never had a problem with gear bind on asphalt or hardpack. Built 460 and a C-6 boy she'd put away a few gallons of fuel...
![]() |
![]() |
![]() |
![]() |
#12 |
got boost?
Join Date: Mar 2005
Posts: 123
|
there are only two different ring & pinion combo's in gm rears that come anywhere close to 3.08:1 ratio;37-12 & 40-13.
the 37-12 works out to 3.08333333:1 the 40-13 works out to 3.07692307:1 neither of which can round down to 3.07. the 3.07 does not exist in gm products. IT'S A 3.08!!!!!
__________________
'70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black" ![]() |
![]() |
![]() |
![]() |
#13 | |
Check out GMTrucks.org
Join Date: Sep 2003
Location: Boise, Id
Posts: 284
|
Quote:
http://www.tocmp.com/brochures/GMTru...ion-12_jpg.htm |
|
![]() |
![]() |
![]() |
#14 | |
got boost?
Join Date: Mar 2005
Posts: 123
|
Quote:
uuuummmmm, it's a sales brochure. & some survey done by gm told the sales team that 3.07:1 was a popular ratio? this ain't fuzzy math. do it on YOUR calculator.
__________________
'70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black" ![]() |
|
![]() |
![]() |
![]() |
#15 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
OK..you ask...and here is an asnwer.
Car 12 bolts and truck 12 bolts are not the same thing. So, make life easy, and only list the .xx instead of rounding, or listing .xxx or .xxxx. Now then, since we are only going to the hundredths position, and one is .08, and one is .07, we can easily know what is what. If you walked into a shop and said you needed a 3,07 for your 12 bolt, the GM tech would know right off the bat that we were dealin with a truck 12 bolt...and not a car 12 bolt. There is no rounding... no BS...just the simple fact that one is a 3.07, and the other is a 3.08. That's it, plain and simple, 3.07 is truck, 3.08 is car. Too hard to grasp? |
![]() |
![]() |
![]() |
#16 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
|
:d
__________________
71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
![]() |
![]() |
![]() |
#17 |
got boost?
Join Date: Mar 2005
Posts: 123
|
'cept only the 40-13 tooth r&p are available for the truck & car 12 bolts.
btw the ring gears are the same.only the pinions are different. the 37-12 is only available in some early ten bolts. that means the 12 bolt car ratio=3.07692307:1 & the 12 bolt truck ratio=3.07692307:1 or 3.08:1 or 308.
__________________
'70 chevy lwb w/'67 hood. 357 s.b.c. built, 4l60 w/vigilante lockup high stall converter, edelbrock pro-flo,brodix heads,comp cams rollerized w/ belt drive, one piece d-shaft, yada, yada, yada..... '82 honda v45 sabre"the black" ![]() |
![]() |
![]() |
![]() |
#18 |
Account Suspended
Join Date: Feb 2005
Location: Yoncalla Oregon
Posts: 775
|
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
![]() |
#19 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,527
|
I had a 12-bolt posi 3.07 in my truck a couple of years ago. I also bought a 3.07 set about 3 months ago out of a 1971 Chevy truck with a 12-bolt rear end. It was also a posi unit. They were both 14-43 gears.
43/14=3.07142857 |
![]() |
![]() |
![]() |
#20 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
|
The trucks are 43/14 =3.07142857 like pj does his math
Not the first time I've seen foot in mouth disease. 40/13..thats 3.08 which is common in a 1968 oldsmobile not a truck! As for 4x4 front.... they are typically 4.55 front or 4.09 front in 3/4 ton 4x4 of this vintage depending what rear ratio you had.
__________________
Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
![]() |
![]() |
![]() |
#21 |
Registered User
Join Date: Apr 2004
Location: Boiling Springs, PA
Posts: 435
|
second that, my 12 bolt truck rear from 71 C10 had 43/14. 3.07 just counted last night
My guess is that 40/13 were car gears, and maybe the 73up truck gear sets I do agree with Chevibubba though, the only new gearsets I seem to find are 40/13 whether truck or car now.
__________________
71 C10 long bed, 2003 6.0L, 06GTO E40, T56, 12bolt 4.10 rear Last edited by 71cadc10; 04-14-2005 at 12:19 PM. Reason: add info |
![]() |
![]() |
![]() |
#22 |
Registered User
Join Date: Jan 2001
Location: Kirkland, WA, U.S.A.
Posts: 32
|
Okay...so all other things being the same a 3.07:1 at 60 MPH is 60.6 MPH with a 3.08:1. That is the difference!
__________________
'68 Chevy Stepside in Frame-up Restoration process. 292 CID Clifford Performance Modified T56 6-speed Tranny Slammed, Custom IFS and IRS Money?...Too Much! |
![]() |
![]() |
![]() |
#23 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
|
![]() ![]() Crazy stuff man! ![]() |
![]() |
![]() |
![]() |
#24 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,527
|
Actually it would be 60.2 with a 3.08.
(3.08/3.07) x 60 = 60.195 |
![]() |
![]() |
![]() |
#25 |
Registered User
Join Date: Jan 2001
Location: Kirkland, WA, U.S.A.
Posts: 32
|
Yeah...your right...I was just focusing on the 0.01 numerical difference.
![]() Well...there you have it, 0.2 MPH difference! Better go with the 3.08 ratio so you will accelerate quicker! ![]() Oh...incidentally you have to go about 315 MPH until it makes a 1 MPH difference.
__________________
'68 Chevy Stepside in Frame-up Restoration process. 292 CID Clifford Performance Modified T56 6-speed Tranny Slammed, Custom IFS and IRS Money?...Too Much! |
![]() |
![]() |
![]() |
Bookmarks |
|
|