"Creep" in neutral - have you had this happen? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CCCC · 02-25-2010, 02:22 AM

!969 K20 with 4 speed manual. Fired it up this AM after a cold night in the garage to go yank another truck from a snowdrift. It was in 4wd low range. When starting to back up, noticed that it seemed to "drag" a bit, so put it in neutral to think about the matter, and noticed that, at somewhat fast idle, it wanted to creep forward ever so slightly - but noticeable. Did not have time to fool with it at the moment, so backed out, went and did the task.

Everything seemed to work fine out in the snow. Then, pulled onto smooth/level garage floor and, before shutoff, left it in neutral and got the same slight forward creep. I think the effect changed a bit depending on clutch engage/disengage.

Has anyone experienced this? With the low temps, could it be very stiff gear lube somehow transmitting drive energy to a gear or shaft? Or, might there be some actual mechanical event going on in there due to wear factor, or need for adjustment,etc.?? There is no real thrust, so does not seem dangerous - just bothersome, because it is an anomaly.

Any thoughts or explanations? Thanks.
CCCC

Mr Pops · 02-25-2010, 03:10 AM

I've had the same thing happen with my 700R4

02-25-2010, 02:22 AM	#1
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	"Creep" in neutral - have you had this happen? !969 K20 with 4 speed manual. Fired it up this AM after a cold night in the garage to go yank another truck from a snowdrift. It was in 4wd low range. When starting to back up, noticed that it seemed to "drag" a bit, so put it in neutral to think about the matter, and noticed that, at somewhat fast idle, it wanted to creep forward ever so slightly - but noticeable. Did not have time to fool with it at the moment, so backed out, went and did the task. Everything seemed to work fine out in the snow. Then, pulled onto smooth/level garage floor and, before shutoff, left it in neutral and got the same slight forward creep. I think the effect changed a bit depending on clutch engage/disengage. Has anyone experienced this? With the low temps, could it be very stiff gear lube somehow transmitting drive energy to a gear or shaft? Or, might there be some actual mechanical event going on in there due to wear factor, or need for adjustment,etc.?? There is no real thrust, so does not seem dangerous - just bothersome, because it is an anomaly. Any thoughts or explanations? Thanks. CCCC __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

02-25-2010, 03:10 AM	#2
Mr Pops Ridin' Dirty Join Date: Oct 2009 Location: Ardrossan Alberta Canada Posts: 2,193	Re: "Creep" in neutral - have you had this happen? I've had the same thing happen with my 700R4 __________________ 1978 C3500 Crewcab (Project) 1979 C2500 Crewcab (Driver/project) 1988 R2500 Crewcab (Driver) 1988 V3500 Crewcab 1988 R2500 Crewcab (Mint, Ex Fire Dept) 1968 Chev Suburban (4x4 conversion) LINK 1970 Chev C20 Suburban (driver/cruiser)LINK 2005 Impala (Incognito vehicle) 2004 Yukon XL Denali (Kid hauler) 1947 Case tractor Facebook Page(1000's of pictures of GM cars and trucks organized into albums) YouTube Channel



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