3:07 gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

fine 67 · 04-02-2005, 01:19 PM

i"m doning a full frame off on my 72 blazer . new motor/tranny both 350's with 3:07 gears and L 78 -15 or p 235 will the truck be a gutless slug.are 3:73 the way to go thanks

BobbyK · 04-02-2005, 01:32 PM

3:73 are an all-round good gear ratio.Good in the city and fine at hwy speeds.

3chevys · 04-02-2005, 01:45 PM

I have both 350's as well with 4:11, and was told by club members that 3:73 is the way to go.

bpmcgee · 04-02-2005, 04:20 PM

Well, that's a religious question. Personally I find that my Blazer with 3.07s isn't slow at all. It's not a hotrod, but I built it trying to get good gas mileage, not burn rubber.

Brian

bouncytruck · 04-02-2005, 11:27 PM

My '72 has 235/85R16 and 3.07's. It is a stock combo so it is definately very driveable. I don't notice any lack of power in my truck, but I would like to swap up to the 3.73s and get a slightly larger tire. My '69 has 4.10's with 35" tires but since that truck has a built 350 and a shift kit, it is hard to judge the difference.

**FRENCHBLUE72** · 04-03-2005, 12:45 AM

I really like my 3:73's with the 32x11.50 tire and a crate motor moves it pretty good..

Jimmy72custom · 04-03-2005, 01:12 AM

I'm running 260 hp 350ci, SM465, 307 gears, 33x12.50x15. I'm turning about 2200 rpm @ 65 mph in fourth gear.

04-02-2005, 01:19 PM	#1
fine 67 Junior Member Join Date: Jun 2001 Location: webster,n.y.,usa Posts: 127	3:07 gears i"m doning a full frame off on my 72 blazer . new motor/tranny both 350's with 3:07 gears and L 78 -15 or p 235 will the truck be a gutless slug.are 3:73 the way to go thanks

04-02-2005, 01:32 PM	#2
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,769	3:73 are an all-round good gear ratio.Good in the city and fine at hwy speeds. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

04-02-2005, 11:27 PM	#5
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,049	My '72 has 235/85R16 and 3.07's. It is a stock combo so it is definately very driveable. I don't notice any lack of power in my truck, but I would like to swap up to the 3.73s and get a slightly larger tire. My '69 has 4.10's with 35" tires but since that truck has a built 350 and a shift kit, it is hard to judge the difference. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

04-03-2005, 12:45 AM	#6
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	I really like my 3:73's with the 32x11.50 tire and a crate motor moves it pretty good.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

04-02-2005, 01:45 PM	#3
3chevys Junior Member Join Date: Jul 2004 Location: Bend, Oregon Posts: 37	I have both 350's as well with 4:11, and was told by club members that 3:73 is the way to go.

04-02-2005, 04:20 PM	#4
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Well, that's a religious question. Personally I find that my Blazer with 3.07s isn't slow at all. It's not a hotrod, but I built it trying to get good gas mileage, not burn rubber. Brian

04-03-2005, 01:12 AM	#7
Jimmy72custom Registered User Join Date: Apr 2004 Location: Willits Ca Posts: 261	I'm running 260 hp 350ci, SM465, 307 gears, 33x12.50x15. I'm turning about 2200 rpm @ 65 mph in fourth gear.



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