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Shake 40-60mph

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Old Apr 16, 2012 | 01:18 PM
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Default Shake 40-60mph

Hey guys,
When accelerate to sixty there's a bit of a shake between 40 and 60, it not so harsh so I wasn't sure if it's cuz the larger mud tires. But lately if I'm at lets say 45 and it shifts into last gear, it'll kind of like buck till I get to 50. Like it isnt supposed to shift yet. And if I let off the gas between the 40 and 60, it shakes pretty hard. Took it to a shop and they said the alignment was good and since the tow/camber was good the ball joints are good. I'm thinking then when he worked on the t case maybe he didn't align/balance the driveshaft correctly? Any ideas?
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Old Apr 16, 2012 | 03:52 PM
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Mine did that and it was the u joint.
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Old Apr 16, 2012 | 04:48 PM
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Alright thanks. I saw the seal from transfer case to tranny is leaking a bit too. So I got that estimated. 250 to take it all out and replace all the seals. Even tho it's a rebuilt t case, like a newb didn't use new seals. Lol and he's ase certified....
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Old Apr 16, 2012 | 07:06 PM
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I got under it and tried to move the driveshaft. There's no play in it at all. That's means the u joints are fine right?
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Old Apr 16, 2012 | 07:43 PM
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Originally Posted by kgintner1
I got under it and tried to move the driveshaft. There's no play in it at all. That's means the u joints are fine right?
Not necessarily, mine were bad, and I could barely move them once the drive shaft was off.
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Old Apr 16, 2012 | 08:10 PM
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Oh ok I didn't know that. When I was spinning to front driveshaft that's goes to front wheels, I noticed there's a bolt missing and ones missing. Got it tightened but gotta pick up another bolt. Think this could be it?
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Old Apr 16, 2012 | 08:11 PM
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Originally Posted by ObsoleteE

Not necessarily, mine were bad, and I could barely move them once the drive shaft was off.
Seeing that they aren't expensive I'll change them and see if that fixes them.
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Old Apr 16, 2012 | 10:36 PM
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Originally Posted by kgintner1
Hey guys,
When accelerate to sixty there's a bit of a shake between 40 and 60, it not so harsh so I wasn't sure if it's cuz the larger mud tires. But lately if I'm at lets say 45 and it shifts into last gear, it'll kind of like buck till I get to 50. Like it isnt supposed to shift yet. And if I let off the gas between the 40 and 60, it shakes pretty hard. Took it to a shop and they said the alignment was good and since the tow/camber was good the ball joints are good. I'm thinking then when he worked on the t case maybe he didn't align/balance the driveshaft correctly? Any ideas?
How big are your tires? Because i have a 97 as well and when i got my 305/40r22 wheels(32" diameter) my truck did the exact same thing. There close to stock wheel diameter but i did the calculations and my 22"s with the tires weigh just as much as the stock 16" rims with 35" tires do. I upgraded from stock 3.55 to 4.10 gears and the bucking went away. Im not 100% sure but i think the '97 trannys have a hard time pushing heavier then stock wheels/tires
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Old Apr 16, 2012 | 10:54 PM
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I have 33x12.5 on 16" wheels
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Old Apr 17, 2012 | 08:14 PM
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Holy crap. I think I found it. Where the tcase meets the tranny. The bottom is tight but the top bolts have come loose and are gone and they are separating.
Here's a pic.


Shake 40-60mph-image-2192563891.jpg

As u can see Theyre separated
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