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07-25-2012, 12:13 AM
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#1 |
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Registered User
Join Date: Oct 2011
Location: Houston tx
Posts: 701
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Clatter/rattle
What could be causing my motor to clatter/rattle when it goes into 4th gear.. I've pulled the valve covers and nothing loose. It's when I'm driving normal and go into 4th but if I'm getting on it it won't rattle at all.. Some1 told me its due to the rpms dropping to low but I'm lost. thanks for any advice/tips
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07-25-2012, 01:33 AM
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#2 |
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Senior Member
 
Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,373
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Re: Clatter/rattle
ttt
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A husband can be right...or...A husband can be happy.  67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk.  1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc   JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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07-25-2012, 05:48 AM
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#3 |
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Registered User
 Join Date: May 2007
Location: dallas ga
Posts: 1,505
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Re: Clatter/rattle
most likely low rpm is the cause.... what rear gear do you have?
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07-25-2012, 09:39 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: Clatter/rattle
Detonation! What's your timing set at?
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07-25-2012, 11:24 AM
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#5 |
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Registered User
Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Clatter/rattle
i would also say your letting your r.p.m.'s get to low, and your timing may be a little to advanced....try to shift so when you go into forth your rpm is still above 1000 rpm....
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07-26-2012, 02:54 AM
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#6 |
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Registered User
Join Date: Oct 2011
Location: Houston tx
Posts: 701
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Re: Clatter/rattle
Don't know what size gear the truck has it was that way when I bought it.. I'll double check the timing .. Can't keep the rpm's up its a automatic ... Thanks for the tips
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07-26-2012, 03:42 AM
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#7 |
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Senior Member
Join Date: Oct 2011
Location: Lewiston, ID.
Posts: 628
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Re: Clatter/rattle
Loose torque converter bolts,,, when your accelerating or decelerating the bolts are anchored to the flex plate,,, when your cruising the bolts are banging back and forth in the flex plate holes.
__________________
Wade  , JUST WALK AWAY, AND I'LL SPARE YOUR LIVES!!! , Build thread "TANGERINE" http://67-72chevytrucks.com/vboard/s...d.php?t=498570 Board Members Met: bigblock68, ol_skool_chevy ,68TT,atvpro |
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07-28-2012, 02:24 AM
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#8 |
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Senior Member
Join Date: Oct 2011
Location: Lewiston, ID.
Posts: 628
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Re: Clatter/rattle
So,,,,have you figured it out yet???
__________________
Wade , JUST WALK AWAY, AND I'LL SPARE YOUR LIVES!!! , Build thread "TANGERINE" http://67-72chevytrucks.com/vboard/s...d.php?t=498570 Board Members Met: bigblock68, ol_skool_chevy ,68TT,atvpro |
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07-28-2012, 05:47 PM
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#9 |
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Registered User
Join Date: Oct 2011
Location: Houston tx
Posts: 701
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Re: Clatter/rattle
No I've been stuck out here at work working a lot of OT but now I have a bad missing/idle problem so 1st I gotta figure that out and go from there... I'm pretty sure the idle is related to carb/fuel ... I'll tear into it maybe tomorrow night or monday thanks
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07-28-2012, 11:35 PM
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#10 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: Clatter/rattle
Bad missing idle could also be too much timing. An easy check is to remove and plug the vacuum hose to your distributor.
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08-04-2012, 07:41 AM
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#11 |
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Registered User
Join Date: Oct 2011
Location: Houston tx
Posts: 701
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Re: Clatter/rattle
Update: had the carb rebuilt and timing checked/set, so she's puring like a kitten now.. Also rewired the alt to charge properly.. Double checked the torque converter bolts as they were tight... Ran it by buddy's shop and we took it for a spin and he said the same things a few of y'all said and it's the RPM's are dropping to low when it goes into OD... Time for some 3.73 or some 4.10's thanks for all the help
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