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03-15-2004, 02:38 AM
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#1 |
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Registered User
Join Date: Feb 2004
Location: Redwood City, Cali4nia
Posts: 63
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WTF? K/10 dana44 w/3.07's?
Granted this '72 has the granny low top loader muncie (I think) with a 205 transfer case, how in the hell is it going to turn any tire bigger than a 50 series car tire without smokin the clutch. And I sure as hell don't want to be doin no 200mph on 40" gumbo's.
I wanted to run some 35's possibly 37's since I just put in a 6" suspension and 3" body lifts(guess I'll be takin out that 3" body kit now). And if I opt a gear swap what is the max the current carriers will allow me to go up too? 3.07's(43-14) are what my kids' Smokey and the Bandit T/A had in it. "This is John Cameron Swaze, and we're strappin this Timex onto the front bumper of this truck as it attempts the Rubicon at 75MPH." What reasonable options do I have? |
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03-15-2004, 09:15 AM
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#2 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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my 85 K5 had 3.08s w/ a 305 and 700r4 and it sucked turning 35s. couldn't use the od.
carrier brake is 3.73 i believe.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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03-15-2004, 09:37 AM
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#3 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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3.07 was the standard ratio for all half ton trucks with a 350 engine. Remember that there was no O/D available.
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Tim |
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03-15-2004, 09:21 PM
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#4 |
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Registered User
Join Date: Aug 2002
Location: Iowa
Posts: 119
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My blazer has 3.07s, with the SM465 4 gear, and 36" swampers...
Its still pretty tractable on the street (I rarely use 1st gear), but then I have a big block... I intend to go to a 3/4 ton D44 with 4.10s in it, to get the bigger brakes, and the matching stout 14B FF rear. Axle swaps can be done pretty cheap, and if you really rock crawl it, I don't think the 12B rear is up to too much punishment... If you wanna change gears in what's in there, my friend recently bought a bare carrier, for a D44, and it was only like $35...might look into that, if your side gears, etc, are OK -Marty |
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03-15-2004, 09:47 PM
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#5 |
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Registered User
Join Date: Sep 2003
Location: Lewisville, NC
Posts: 1,836
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Those 3.07s are probably what GM called the 3.08, its just like if I do the match from my ring gear then it comes up to 3.40 instead of 3.42, but their just the same.
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1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle. |
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03-16-2004, 01:57 AM
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#6 |
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Big Block Blazer
Join Date: Sep 2003
Location: Ellsworth, ME.
Posts: 509
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I have 3.08's in my Blazer and I have no problems
 I just had my whole Rear End re-done, and I almost opted to do 3.42's instead, but I didn't want to have to change the front carrier as well. I might do it sometime in the near future.
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[1985 Chevrolet K5 Blazer][454BBC][TH400][NP241][Dana 44][GM 12 Bolt w/ Eaton LSD][Hedman HTC Hedders][Dual 2.5" Stainless Steel Exhaust][Hedman Turbo Muffler's][Dual Spal's 14" Electric Fan's][32x11.50R15 BF Goodrich All Terrain TA KO's on 15x8 Rallys] |
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03-16-2004, 07:22 PM
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#7 |
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Registered User
Join Date: Jun 2003
Location: Calgary AB
Posts: 110
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Your truck has a 12 bolt rear end right? If you go to a gear set 3.73 or higher (numerically) you will have to change the carrier. However, like Jims70gmc said you can go up to 3.73 with the D44 carrier
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You can't get out if ya don't get in |
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03-16-2004, 07:50 PM
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#8 |
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Registered User
Join Date: Feb 2004
Location: Redwood City, Cali4nia
Posts: 63
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Thanks for the info. I am concidering a 3/4 ton 4x4 swap also.
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03-17-2004, 03:41 AM
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#9 |
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Registered User
Join Date: May 2003
Location: brooksville-fla
Posts: 77
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you do not HAVE to change the carrier-they make thicker and thinner gear sets to put whatever ratio you want into whatever carrier you have-I saw them at moser engineering IIRC
I have a 1972 LWB/465/205 and 35x12.5x15 tires-I just got the truck and it must have 3.08 gears too...kinda silly -except for driving on the interstate
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1972 LWB 4x4 1970 LWB 2wd 1971 chevelle 1972 datsun PL-521/nissan |
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03-24-2004, 04:37 AM
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#10 |
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please don't break
Join Date: Sep 2003
Location: southern california
Posts: 173
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my 70 k10 with 350/sm465/205 has stock gears and 35's. i thought it had 3.73 but maybe i'm wrong. it isn't too bad to take off. if i'm pointed even a little up hill i use the granny low. when i swap out my 12 bolt i want to got to 4.10's or 4.56's, probly 4.10's for highway driving. right now i'm turning about 2200 rpms at 70mph. its just too high
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