"clunk" upon deceleration

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Feb 11, 2007 | 01:37 AM

boomhowre

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"clunk" upon deceleration

I recently bought an 88 F150, 302 with an automatic transmission. I've noticed upon deceleration sometimes, like when i take my foot off the gas, there is a clunk or slight "jump" that feel like it's coming from the transmission. Supposedly the tranny was rebuilt fairly recently along with the motor...

Any ideas what it might be or where to look? Also, how bad a problem is this? I mainly use this truck for yard work and hauling my dirtbike around.

Feb 11, 2007 | 01:44 AM

jyccustoms

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Joined: Oct 2006

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From: Cisco Texas

i would put it in park,crawl under the trk and see how loose the ring and pinion are.maybe a u joint?

Feb 11, 2007 | 01:46 AM

hillbilly delux

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From: Topeka, KS / Okmulgee, OK

Quote:

Originally Posted by jyccustoms

i would put it in park,crawl under the trk and see how loose the ring and pinion are.maybe a u joint?

Check the easy stuff first= see if there is any slop in the u-joints.

Feb 11, 2007 | 02:04 AM

jyccustoms

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Joined: Oct 2006

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From: Cisco Texas

or the ring and pinion,it sounds like the tronny is slowing faster than the rear end,that would make a nice loud clunk,my 88 f150 300-6 mt5od made me kringe when i let off the gas

Feb 11, 2007 | 08:05 AM

bohiaa

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Joined: Mar 2006

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From: Bellville TX. Wof Houston

this may not be your issue

but mine was doing this and it was the leaf spring bushings

they were baddd

Feb 11, 2007 | 08:15 AM

wizzard351

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Joined: Sep 2004

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From: wi

how can you check the u-joints in park? there will be tension on the drive shaft then. i always blocked the wheels and left in neutral to check u-joints.

Feb 13, 2007 | 10:35 AM

boomhowre

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thx guys...I'll get out the ole service manual and look into that stuff, kinda had a feeling it might be u-joints.

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Feb 13, 2007 | 01:17 PM

jyccustoms

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From: Cisco Texas

your right wizzard,i should have said parking brake.sorry about that.thanks for cetching me.

Feb 14, 2007 | 06:27 AM

#10

michiganredneck

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I suprised no one said to check trans mount that could be the problem, make sure its not loose or broken. hope this helps you out

Feb 14, 2007 | 06:58 AM

#11

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

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From: Easton,Ks

Sounds like either the anti-clunk spring was left out on the rebuild or the TV adjustment at the throttle valve is out of adjustment.
More than likely the TV adjustment if every thing else is tight.

Last edited by subford; Feb 14, 2007 at 07:00 AM.