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10-29-2005, 11:22 AM
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#1 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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reverse issues
ok, so I went to backup the other day, and the rear seems to want to hop ALOT while in reverse......i mean, feathering the clutch out nice and smooth, right RPM's.....and it just wants to shake the truck apart.....any input?
It's a 3 on the tree setup with a 250.....not sure of the specific transmission, but I know on flat ground, I don't have this problem....slight to deep grades....I am screwed....thankfully all I had infront of me was a 6" curb....rather than backup all the way, I just ran over it! 
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10-29-2005, 12:10 PM
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#2 |
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My son, my joy.
Join Date: Sep 2003
Location: Spokane WA
Posts: 463
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Re: reverse issues
Sounds like the clutch. Give it a little more gas while letting out the clutch. I used to drive big trucks for a living and sometimes I'd space and let the clutch out to slow or with too little throttle and the truck would shake like crazy.
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'69 Chevy 3/4 ton, 327cid, Carter AFB, Edelbrock intake, HEI, TH400. Founding member of the No Money To Spend On My Truck Club. When your at Home Depot, you WISH you had gotten an 8 foot bed! |
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10-29-2005, 12:20 PM
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#3 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: reverse issues
Time to change out the clutch--not enough spring pressure in the disk or pressure plate. ( buy a NEW one--4 out of 5 rebuilt ones will do the same thing).
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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10-29-2005, 12:35 PM
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#4 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: reverse issues
anyway to test the clutch before I signup for a clutch replacement? Is this only going to be a problem in reverse.....or will I shortly see problems in forward gears also?
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10-29-2005, 01:31 PM
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#5 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Re: reverse issues
I'd fix it ASAP. My uncle had an old 70's furd F100 with a 4 speed that did the same thing when you took off in 1st. He'd let the clutch out slow and the whole truck would shake. Turned out to be a warped pressure plate.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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10-29-2005, 11:20 PM
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#6 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: reverse issues
Make sure you have some freeplay (clutch pedal moves a little before it has any resistance).
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 10-29-2005 at 11:21 PM. |
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10-29-2005, 11:25 PM
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#7 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: reverse issues
Is it wheel hop or is it the clutch chattering because of a bad disc or bad motor mounts. Mine used to chatter so bad in low or reverse that the hood would bang like a big old gong. New motor mounts (front & rear) tamed it down pretty well.
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10-29-2005, 11:44 PM
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#8 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: reverse issues
if it is chatter, there could be a few reasons including a warped pressure plate, warped flywheel, oil on the fly wheel from a junk rear main seal, weak spring pressure... even the fubared motor mounts.
Either way, it will get worse, it will start doing it on forward gear take off, and it is not good for the Zbar and linkages. (let alone the trans bearings and mainshaft...and to a lesser extent...the shock goes up the crank shaft too. |
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10-30-2005, 12:31 AM
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#9 |
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Registered User
Join Date: Apr 2005
Location: Chula Vista, California
Posts: 495
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Re: reverse issues
As all of the above have said, "your clutch is toast", (and we don't mean the
toast of the town...). It WILL get worse. Probably far from home, at night, on a holiday. Tear it down & replace EVERYTHING with new, not rebuilt parts. Put in a fresh throwout bearing, pilot bushing, clutch disc and pressure plate. Remove the flywheel and have any good machine shop surface it. If you do all of the labor yourself, you will probably spend about $300.00. Also, with the flywheel removed you can inspect the rear main and pan seals and make sure your clutch slippage is not "oil-assisted". Good luck!!!
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rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed |
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10-30-2005, 07:18 PM
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#10 |
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Senior Member
Join Date: Jan 2005
Location: Loveland Co.
Posts: 3,098
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Re: reverse issues
My wife's truck did the same thing, put a new clutch in when we did the motor, and it went away.
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Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html |
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10-31-2005, 07:52 AM
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#11 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,507
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Re: reverse issues
Check for a bad motor mount before you start tearing apart the clutch.
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Tim |
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