Go Back   Infamous Nissan - Hardbody / Frontier Forums > Tech Area > Suspension

Reply
 
Thread Tools Display Modes
Old 09-04-2021, 10:18 PM   #1
D21HONG
 
Join Date: Aug 2021
Location: Canada
Posts: 11
Vehicle: 1993 D21 short box/single cab
Thanks: 3
Thanked 3 Times in 2 Posts
Default Vibration between 40-60 MPH. 4" drop block 6 degree shim.

Having issues with vibration, I've got 2 degree drop blocks with 4 degree shims. Taller end towards back of truck, only went with a total of 6 degrees as it seems like consensus of a what it takes to lower a hardbody this much.

Vibration does not happen upon acceleration, only at specific cruising speed. Is it possible to have too much angle?

I know stacking blocks is a no no but it's temporary until I run air suspension next year. It's a project not a daily. Would like to figure out now while static as this is the driving height I'm after.

Last edited by D21HONG; 09-04-2021 at 11:45 PM.
D21HONG is offline   Reply With Quote
Old 09-05-2021, 01:24 AM   #2
89'HBV6
Ol'school Geek
 
89'HBV6's Avatar
 
Join Date: Mar 2020
Location: Washington State / the Left Coast
Posts: 939
Vehicle: 89' D21 KC SE V6 5spd 2WD - 87' D21 KC SE V6 5spd 2WD
Thanks: 817
Thanked 209 Times in 191 Posts
Default

I understand where your question is going, but let's check some simple stuff first...

Check the balance of the tires/rims?
Air pressure equal all around?
How old are the tires?
Last rotation?
__________________
. . . Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
89'HBV6 is offline   Reply With Quote
Old 09-05-2021, 01:46 AM   #3
D21HONG
 
Join Date: Aug 2021
Location: Canada
Posts: 11
Vehicle: 1993 D21 short box/single cab
Thanks: 3
Thanked 3 Times in 2 Posts
Default

Quote:
Originally Posted by 89'HBV6 View Post
I understand where your question is going, but let's check some simple stuff first...

Check the balance of the tires/rims?
Air pressure equal all around?
How old are the tires?
Last rotation?
I'm actually leaning towards it being the tires too, it didn't do this before the drop but the geometry change could have had an adverse effect on them. Tires currently on the truck are old and dry.

Have brand new rims and tires on order, will check back in once those are installed.
D21HONG is offline   Reply With Quote
Thanked by:
89'HBV6 (09-05-2021)
Old 09-05-2021, 03:22 AM   #4
EF2
 
EF2's Avatar
 
Join Date: Jan 2015
Location: colorado
Posts: 305
Vehicle: 94 king cab
Thanks: 21
Thanked 71 Times in 56 Posts
Default

i’m about a 7 inch drop in the rear and only have 3 degree iirc 2 inch drop blocks and only get a slight vibration around 80mph. i DID notice that it looks like there’s some fresh transmission fluid leaking from my slip yoke, but i haven’t looked too much into it atm. i also feel like i got lucky on how mine is so far, i’ve heard others have had way more issues so there’s that lol.
EF2 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:28 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.