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12-10-2004, 02:04 AM
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#1 |
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Registered User
Join Date: Aug 2002
Location: Santa Fe NM
Posts: 393
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Help Rearend
Well i keep on breaking my ujoint caps right off it seems to always happen when i stop at a light and i mash the throttle.
What could be the problem? The truck is a GMC with leaf springs 350 tranny and engine with i think a dana (how can i check?) Could my rearend be tweaked? Riddla
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68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance   B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die |
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12-10-2004, 07:08 AM
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#2 |
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Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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It sounds like you are binding the joint. do you have a lift or drop that changed the angle at all? Or could just be the axle windup twisting the springs causing the joint to stress and brake. A ladder bar or strut from axle to the front of the spring should help.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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12-10-2004, 11:25 AM
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#3 |
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Hittin E-Z Street on Mud Tires
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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There should be a code stamped on your rear axle facing the front of your truck near the top on the passenger side axle tubing. Some are near the pumpkin and some are near the hub. You may need to do some wire brushing. Go to this web page to look up the codes: http://www.gmcpauls.com/67-72_chevy.htm There should be two letters, which are the code, and several numbers. The numbers are simply the date the rear-end was stamped. Also, your glovebox door should list the ratio, but the glovebox door or rearend could have been swapped out. Same question as above, and how much horsepower does your motor have?
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12-10-2004, 12:28 PM
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#4 |
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Registered User
Join Date: Aug 2002
Location: Santa Fe NM
Posts: 393
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yes i do have a drop on the front
The horsepower i wouldntn know i havent dynoed it i should though ive smoked a nissan z twin turbo with a supra behind it lol before so that an idea i guess
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68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die |
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12-10-2004, 12:30 PM
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#5 | |
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Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,980
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Quote:
 ( Sorry couldn't resist)
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BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , |
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12-10-2004, 12:32 PM
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#6 |
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Registered User
Join Date: Aug 2002
Location: Santa Fe NM
Posts: 393
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Lol It could be size 13s
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68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die |
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12-10-2004, 02:06 PM
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#7 |
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Left Foot Functioning
Join Date: May 2004
Location: Duncan, OK
Posts: 348
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Is your driveshaft one piece or two?
SSOW
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69 C10 (#1 son's ride) 72 C20 (Dad's farm truck) 82 K30 (Ex - brush pumper project) |
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12-10-2004, 04:09 PM
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#8 |
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Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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Big Fat Guess: Sounds like you're running high hp thru a driveline with only 1310 size yokes. You might have a driveshaft shop evaluate the strength of your yokes against your hp/torque. They might recommend upgrading to 1350 yokes. If a 2wd w/coils, perhaps poly trailing arm bushings would help stablize the rear suspension. Check the tightness of the u-bolts. Just conjecture, really.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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12-11-2004, 03:07 PM
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#9 |
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Registered User
Join Date: Aug 2002
Location: Santa Fe NM
Posts: 393
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Its a one piece driveshaft i twisted a lite weight one i had before now its a caprice driveshaft
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68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die |
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