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05-20-2021, 04:46 PM
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#1 |
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Registered User
Join Date: Mar 2019
Location: SAN RAMON
Posts: 73
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Transmission "Bump" at stop
Fellas,
After I put in a new crate 350 about 3K miles ago, I've noticed something little odd with the transmission - which is a TH350 auto with the standard 3 on the tree for a 64. It shifts fine and smooth, kick-down is perfect - but sometimes when I get to a stoplight, I feel a very slight bump - like it's "resetting" into 1st gear - after it's already dropped to 1st. Performance is great, fluid level is good - it's just a new thang. I'm curious if this is a sign of bad things to come, torque converter related (?), or the classic "Nothing to see here...". Any thoughts/comments appreciated - as always.
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64 C10 Custom 70 C10 Stepside w/67 Front End Clip 1970 Buick Ragtop 2003 Anniversary Road King Classic |
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05-20-2021, 05:08 PM
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#2 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,153
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Re: Transmission "Bump" at stop
Couple of things to check:
Vacuum modulator hoses are in good condition and vacuum port in manifold is not clogged... Engine idle speed a tad too high Trans fluid a little low...how long since trans filter and fluid was changed? I doubt the convertor is an issue.... 
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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05-20-2021, 05:54 PM
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#3 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Transmission "Bump" at stop
Driveline/driveshaft bind up like that's has been so common in modern trucks?
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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05-20-2021, 10:06 PM
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#4 |
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Senior Member
 Join Date: Jan 2009
Location: huntington beach california
Posts: 975
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Re: Transmission "Bump" at stop
Three on the tree is a 3 speed manual shift on the steering column. It is not a automatic transmission
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Pulatoy |
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05-20-2021, 10:58 PM
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#5 | |||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Transmission "Bump" at stop
Quote:
Check to see if the torque converter bolts are tight at the flex plate. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-21-2021, 09:10 AM
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#6 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,508
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Re: Transmission "Bump" at stop
What carb?
Maybe fuel level isn’t ‘great’ once in awhile. Could be A very slight bit of sloshed fuel. Gives a little surge. What distributor? Weights could be hanging up. And is vac advance hooked to ported or manifold vacuum port? Last edited by geezer#99; 05-21-2021 at 10:06 AM. |
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05-21-2021, 10:29 AM
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#7 | |
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Registered User
Join Date: Mar 2019
Location: SAN RAMON
Posts: 73
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Re: Transmission "Bump" at stop
Quote:
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64 C10 Custom 70 C10 Stepside w/67 Front End Clip 1970 Buick Ragtop 2003 Anniversary Road King Classic |
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05-21-2021, 01:20 PM
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#8 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,472
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Re: Transmission "Bump" at stop
Might double check the motor and trans mounts for tightness. Several hundred pounds of engine/trans settling back into place can often be felt.
Also check the bolts holding the engine/trans together plus the bolts on the flex plate. Something loose/worn in the rear end/spring shackles? |
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05-21-2021, 06:01 PM
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#9 |
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Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,164
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Re: Transmission "Bump" at stop
Like has been suggested I would remove the driveshafts and check out the U joints.
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05-23-2021, 10:04 AM
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#10 | |
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Registered User
Join Date: Mar 2019
Location: SAN RAMON
Posts: 73
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Quote:
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