This is what I was thinking too.
ome lift now have vibration (didnt before)
- Thread starter hward1
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This is what I was thinking too.
hward1
87 fj60 / 95 fjz80
- Thread starter
- #102
well after tearing everything apart again -- cut off a portion of the spacer and bolt head - doesnt hit anymore -- but ---- didnt change the angle one bit ---- so 2 degree shims is not enough to change that angle (hope by cutting them the spacer doesnt pop out dont think it would be able to pop out but probably bounce some (not sure) might tac weld it in place
but what changed the angle was bringing up the rear end with the tires im going to run --- after all of that
it should be within the 3 degree change with load - not sure what size to get to bring it down even more ---
tires added = 1 degree change
difference tires added
pic below is with old small tires: both are with 2 degree shims
but what changed the angle was bringing up the rear end with the tires im going to run --- after all of that
it should be within the 3 degree change with load - not sure what size to get to bring it down even more ---
tires added = 1 degree change
difference tires added
pic below is with old small tires: both are with 2 degree shims
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Did you install all four wheels/tires? If you measured the angle with the rears only as shown above, you will not have any change when the install the tall fronts. In the pictures, the 60 sitting at a good angle.
This isn't as hard as all that. Try the shims in both directions and see what works the best. Sometimes what ends up working doesn't make any sense. I had some very weird angles before I went SOA, by the rules it should have vibrated like a V8 with a broken rod, but it actually worked. I had the pinion pointed straight at the T-case, but no CV, and it ran pretty smooth, I left it that way for years and years. After the SOA I had no choice but to get a CV on it. If all else fails, you might want to do that, get a Toyota one from a wrecking yard (Cruiser or mini truck front) and take it to the driveline shop and have them put it together. The Toyota CVs have a zerk for the centering hardware, a lot of (all?) domestic stuff doesn't.
I think you should use some shorter shackles in the rear. I have a Medium suspension kit on mine. A/B rear springs, full kit from MAF. My rear shackles are not that big. I run no shims, and have never had vibes.
Another factor here. My rear driveshaft is longer than yours because I have a 1984 model with a "short" H42 (non-spacer transmission). My driveshaft will sit at a lower angle even if we have the exact same lift installed because my driveshaft is longer. Very minimal difference in angle, but there is a difference.
That being said, throw some shorter shackles on the rear, and go flex out that suspension. Break it in.
I wonder if all these trucks having vibration issues with OME lift are 85+ trucks, with "spacer" transmissions, and one-piece cross members.
Another factor here. My rear driveshaft is longer than yours because I have a 1984 model with a "short" H42 (non-spacer transmission). My driveshaft will sit at a lower angle even if we have the exact same lift installed because my driveshaft is longer. Very minimal difference in angle, but there is a difference.
That being said, throw some shorter shackles on the rear, and go flex out that suspension. Break it in.
I wonder if all these trucks having vibration issues with OME lift are 85+ trucks, with "spacer" transmissions, and one-piece cross members.
driveshafts
ity hasto ber 1 to 3 degrees from driveshaft angle the front ujoint dosent twist sa much as the diff side so unless u got a rock crawler th angle stays consistant the rear u can shim to help withe the demands of the rear articulation if you put to little angle for normal travel u dont get lubercation and for some reasons i dont know you get vibrations the hummers canter the weld yolks to rid that vibration thats why you have to have negative 1 to 3 degrees angel the 69 camero was put together the same way read my name if you dont trust me
ity hasto ber 1 to 3 degrees from driveshaft angle the front ujoint dosent twist sa much as the diff side so unless u got a rock crawler th angle stays consistant the rear u can shim to help withe the demands of the rear articulation if you put to little angle for normal travel u dont get lubercation and for some reasons i dont know you get vibrations the hummers canter the weld yolks to rid that vibration thats why you have to have negative 1 to 3 degrees angel the 69 camero was put together the same way read my name if you dont trust me
Agree with this^. A shorter shackle will reduce that pinion angle. Put the stock shackles back on for now. Or if you really want the height I'd consider getting some cheap aluminum 5* shims and temporarily run them until things break in/settle. Load the truck heavy and use it. The springs will lose some arch with time and the driveshaft angle will improve. My Beltons were the same, vibration most pronounced in 5th in my case. One year later much better.
Another thought, borrow a rear driveshaft from someone to verify it is not out of balance.
If you use the stock shackle it can invert, mine did. Keep what you have, although you might, as I mentioned before, lose the third leaf down in the pack. It will sit more level and ride much better.
Man, that lift really stirred the pot.
Looks awesome though with those new tires. Hope you get it straightened out soon!
Looks awesome though with those new tires. Hope you get it straightened out soon!
What shop do you work at in PHX?
BlueCruiser84
SILVER Star
The shims, for whatever reason, are not turning your pinion angle. Make some wooden shims and jam them in there. Theoretically, you've gotta get the pinion down if you want to run a standard shaft. Like Lehiguy said though, every truck is different. I had a really tall BDS 3 inch lift with extended shackles and never had even a HINT of vibration.
I had an SOA 40 with an in between (not right for a standard or a DC shaft) pinion angle and it would vibrate like crazy. I tipped the pinion up and run a DC shaft and it is nice and smooth.
The tires did nothing to change the pinion angle in relation to your transfer case - they changed the angle of the truck.
I had an SOA 40 with an in between (not right for a standard or a DC shaft) pinion angle and it would vibrate like crazy. I tipped the pinion up and run a DC shaft and it is nice and smooth.
The tires did nothing to change the pinion angle in relation to your transfer case - they changed the angle of the truck.
Those look like trim packs for leveling "leaning" suspensions.
Shims look like shims. Thin on one side fat on the other.... You should be able to put the angle finder on the shim and it should read 2 degrees( not installed on flat surface)...
Just my 2 cents..
Shims look like shims. Thin on one side fat on the other.... You should be able to put the angle finder on the shim and it should read 2 degrees( not installed on flat surface)...
Just my 2 cents..
hward1
87 fj60 / 95 fjz80
- Thread starter
- #117
shims look flat in the pics but are fat on one end - like a wedge - friday going do a driveshaft shop located in Goldsboro NC -- $75 to balance and they said a little more to swap the bad flange out -- they are going to check the angle also -- will update when i have it done -- i feel like i have been defeated if i have to take it to someone ------ i need to put that money towards wheel spacers
BlueCruiser84
SILVER Star
Make sure they check the splines too. I know 80 series have problems with the splines wearing out and causing vibes at speed.
BlueCruiser84
SILVER Star
That's what I was thinking, but I will take the OPs word that they're wedges.
orangefj45
Supporting Vendor
First of all ....... get rid of that cheapie angle finder and get a digital model. You can get them on amazon, ebay, hardware and home improvement stores for about $60 and up. They're a lot more accurate than the one you have.
Go from there ......
Georg @ Valley Hybrids
Go from there ......
Georg @ Valley Hybrids
