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#1 |
Never too many LONGHORNS!
Join Date: Dec 1999
Location: Los Angeles Calififornia
Posts: 423
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Factory "limited slip"locker" in 67-72 K20 front axle??
![]() Just want to know because up until now, I didn't think this existed???? Is this a rare option?? Thanks Jim ![]() ![]() |
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#2 |
Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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I dont know how rare of an option it is but I can say I know its not a terribly good idea to have a locker in the front. Makes for a miserable driving experience on paved roads. Its not bad on dirt for a special purpose vehicle. Clutch poitractions on the road are also creepy to drive. They pull hard to center although they dont transfer all the ratcheting to the center like front lockers do . I have had a few friends with front lockers and clutched posis over the years that they added themselves. I cant say I would do the same unless I was doing a lot of off road stuff. Otherwise its a big hassle.
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No truck :-( |
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#3 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,884
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glovebox door option # 9501AA
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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#4 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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This option sheet was posted about day ago...note the front posi option...although this is a Blazer option sheet.
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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. |
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#5 |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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well, if it has a "posi" front end, then it has a limited slip of some kind, I don't think it would have a locker.
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#6 |
Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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my dad's got a 67 K-20 that the option sticker lists "no spin" differentials......I'm not sure what kind of locker they have, but nothing gives anywhere.....they act like the spiders are welded solid. It drives like a hog, turns super hard, hops around corners, and is nearly impossible to turn in the mud, but it will go about anywhere......I've only seen it stuck once in the 25 years he's owned it......and that was when he dropped it to the frame on one side in a chisel track while feeding cows.......it couldn't climb out because we couldn't pull on the steering wheel hard enough to get a bite on the rut.........Tractor couldn't get it out either. It sat there for 2 weeks till the ground got dry enough to drive it out.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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#7 |
Senior Member
Join Date: Jan 2000
Location: Cincinnati, Ohio
Posts: 1,492
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One of my 71 K20s has the posi front end. It is listed on the glove box. I have had the front end apart and it is a posi, not a locker like the rear has in it. The front end cover also has a posi tag on one of the bolt holes. This truck is a little strange because someone ordered all the creature comforts (air, cheyenne, tilt, am/fm, etc) plus 4.56 gears, locker and posi front. And the best part was the guy I bought it from had no idea. I started the body off restoration on this particular truck in Jan.
I would never recommend locking the hubs in unless you were on a semi slick surface. It puts everything in a bind on a surface with lots of traction. I have lockers in the rear of all my K20s but this is the only posi front I have seen around here. |
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#8 |
Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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My blazer has a posi in the front.As long as the hubs are not locked in, and transfer case is in 2 wheel, the front axel is not driven.When locked in you should be on wet snowy roads or off road where the tires have some slippage.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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#9 |
Registered User
Join Date: Dec 2002
Location: Katy, Texas
Posts: 116
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I have both front and rear axle options on mine
79510AA Positract RR Axle 79501BB Positract Frt Axle options on my Glove Box
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1968 4x4 swb |
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#10 |
Registered User
Join Date: Nov 2002
Location: Eureka Springs AR
Posts: 494
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I was wondering on one with a posi or limited slip in the front if you can lock in only one lockout if it would turn better in the mud?
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Buy Sale or Trade 71 3/4 4x4 72 1/2 ton cheyenne 4x4 |
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#11 |
Seeker of the big and bad
Join Date: Nov 2000
Location: wheatland,Calif,yuba
Posts: 105
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My 71 lgbd has locker in the rear and posi in the front.All stock from what I can tell.
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71 3/4 ton 4x4,665hp 454. 67 GMC 1 ton towtruck 68 chevy LB 4x4 64 chevy LB custom 57 Bel-air 2d station wagon |
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#12 |
Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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we have discovered that you can turn the truck better if you lock only 1 hub, but I wouldn't recommend it because it's pretty hard on the axle that is driving, and depending on what style locker it has, it can be fatal for a differential.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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