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11-18-2002, 04:17 PM
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#1 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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Driveshaft question
I know this should be in the engine/drivetrain section but this one gets more hits.
I have new U Joints and a new Carrier Bearing, when I let up on the gas there's a small vibration, this just started after replacing the joints/bearing. It also still makes a klunk when I put it into reverse. Time to get the shaft balanced? |
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11-18-2002, 05:20 PM
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#2 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Dion, when you are playin with a 2 pc shaft the "balance point" is in 1 place. In other words, the shaft needs to go back together the same way it came apart. Your 3/4 ton should have a slip yolk in the middle where the 2 halves slide together......if this is flipped 180 degrees from original assy, the balance will be off. It may just be a matter of slipping the 2 shafts apart, & turning them 180,& slipping them back together. another thing I have seen, is that a shaft that is in othrewise in balance,& has a vibe can some times be taken loose at the rear diff& turnd 180, then bolted back up to take care of the problem. as far as the clunk, my guess would be rear diff, if you have replaced all the u joints & carrier bearing. have you put a diff in that recently?
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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11-18-2002, 05:24 PM
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#3 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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We put in a new set of gears on Friday but it was doing that before. Could it be that the carrier bearing was installed incorrectly?
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11-18-2002, 05:40 PM
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#4 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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if your truck is raised or lowered from stock height, you could have angles issues as far as the vibe, & may need to check/shim the height of the carrier bearing to get things "right on". The fron 1/2 of the shaft needs to be pretty much straight in line with the trans, then on the back half......say the trans point 4 degrees down, the rear diff needs to point 4 degrees up. I still have a ? on the rear diff tho.......did you loose a cap, or have a cap come loose when the first gearset had problems? Also did you put a new gearset in the old housing?
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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11-18-2002, 05:57 PM
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#5 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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The shaft seems alright, pretty much straight out from the tranny. Bad U Joint? I'll pull it off and check the middle one.
I bought another complete Dana60 from a yard, we took it apart and changed the gears, everything looked good. |
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11-18-2002, 06:02 PM
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#6 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Ok, im with you now on the diff. You might check the center slipyolk to see if there is any wear(up/down, or twist back/ forth on the spline). Good luck.....longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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11-19-2002, 12:24 AM
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#7 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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Everything is nice and tight, I can't figure it out! Could the klunk to reverse be the tranny? It shifts fine but there's a strange vibe still. I'ts really pissing me off, this truck should be perfect at this point.
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11-19-2002, 12:33 AM
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#8 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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How is the rear bushing in the trans tailhousing......can you feel any up/down in the slipyolk?
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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11-19-2002, 12:39 AM
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#9 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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None at all.
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11-19-2002, 01:05 AM
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#10 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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D@mn....Im runnin out of ideas. If you have an open diff, the spiders will havea little 'wrap up",& make some noise going into gear. Detroit lockers(not posi), but a true locker will make quite a clunk as the coggs mesh(they will wrap up about a 1/4 turn before they mesh at times!) If you arent finding anything noticeably loose, I think i would get a cheap angle finder & check angles on the trans & the diff. If that doesnt work,& you know all the pcs were marked on the shaft for same position on reassembly, you may be due for a balance job. good luck.....69
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... Last edited by crazy longhorn; 11-19-2002 at 01:07 AM. |
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11-19-2002, 01:16 AM
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#11 |
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72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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Crazy Longhorn
I just wanted to thank you for all of your time and input on this, thank you.
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11-19-2002, 01:20 AM
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#12 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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No trouble Dion.....
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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11-19-2002, 10:30 AM
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#13 |
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Spank 'em if you got 'em!
Join Date: Nov 2002
Location: Kansas City
Posts: 628
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I ran into the same clunking problem and I use to have this moaning noise (wasn't me) that would come and go continuously. I replace all of my u-joints and carrier bearing hoping that would help, and it did a little. However, after I had to replace my tranny about a week ago, the clunking and the moaning went away completely. Also, while my drive shaft was hooked up, before I changed the tranny there was over 1/4in. play rotation wise in the shaft. After tranny change, no play. I hope this helps.
By the way, when you guys say slip yolk, do you mean spleaned so the shafts just slide apart?
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Long Knight '71 C-20, 350ci, TH350, Edl. 1406 Carb w/elec.choke, Ignitor ignition, Viper Tires, Orange Dipstick |
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11-19-2002, 11:03 AM
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#14 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Yes, on the heavy duty setup the shafts slip apart in the middle. My longhorn is set up this way,& a lot of 3/4tons I have seen are this way. The 1/2 tons I have worked on have had the lite duty(hanger style) carrier........I hate them with a passion! The heavy setup will take some serious abuse.......
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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