05-12-2023, 05:12 AM | #1 |
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rear end shudder
im having a slight issue, 69 gmc k2500, all redone, i went from 4:56 gears to 3:54. it now has a bb 402 and original sm465 trans, and rockwell 221. im getting a shudder when slowing down in 2wd, even when i push in the clutch. would the gearing change affect the t/case? has a 4'' lift also, and i did shim the rear axle for driveshaft alignment...
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05-12-2023, 06:39 AM | #2 |
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Re: rear end shudder
Any other description besides 'shudder'? only thing that comes to mind is while applying the brakes
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05-12-2023, 06:56 AM | #3 |
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Re: rear end shudder
Almost feels like something is binding up with no brakes applied
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05-15-2023, 08:56 PM | #4 |
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Re: rear end shudder
Do you have a clutch style Posi?
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
05-16-2023, 04:48 AM | #5 |
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Re: rear end shudder
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06-02-2023, 09:52 AM | #6 |
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Re: rear end shudder
i pulled out the degreed shims, also gonna start over and bolt up the rear like its written in my books. its only a 4'' lift so im going to try with out shims
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06-02-2023, 10:53 AM | #7 |
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Re: rear end shudder
First thougt for me is something is loose or broken. Nut and bolt everything while you're under there. An easy 20 minute sanity check. You shouldn't have to play with angles. Read your angles and shim appropriatly, it's all that's needed. How about those bearings?
j
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06-02-2023, 11:27 AM | #8 |
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Re: rear end shudder
Rear was all redone, like i said there is a procedure and not sure if I had all tension out of springs and shackles or proper torque on u bolts. It's what happens when u build something and few yrs later u 4get things...lol keep ya posted
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12-23-2023, 07:14 AM | #9 |
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Re: rear end shudder
when i let off the throttle the pinion angle changes giving me that vibration, been adjusting the angle and seems better. i may use this kit https://www.ebay.com/itm/165624965840, whats yur opinion?
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12-24-2023, 05:32 PM | #10 |
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Location: Ozark, MO
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Re: rear end shudder
I think you are on the right track looking at u joints. I bet you can reuse your yoke. Also check your center support bearing.
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12-24-2023, 05:38 PM | #11 |
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Re: rear end shudder
When you decelerate and brake its worse as the pinion is nosing down even more leading me to believe it's binding. I'll get it
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12-24-2023, 08:53 PM | #12 |
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Re: rear end shudder
Are your spring packs stock with leaf clamps. Also known as rebound clips.
Last edited by geezer#99; 12-24-2023 at 09:27 PM. |
12-25-2023, 08:43 AM | #13 |
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Re: rear end shudder
4'' lift springs and u bolts
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12-25-2023, 01:10 PM | #14 |
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Re: rear end shudder
Post a pic of your springs etc.
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03-30-2024, 08:41 AM | #15 |
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Re: rear end shudder
http://67-72chevytrucks.com/vboard/s...d.php?t=220466 got my answer #25
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