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One Bouncing FJ-40

Discussion in '40- & 55-Series Tech' started by Guest, Feb 16, 2003.

  1. Guest

    Guest Guest

    I need your help!! My FJ-40 is SOA with 35 inch tires. Stock springs in the front with a shackle reversal. In the rear, I have old, stiff, 3-leaf Rancho 2 1/2 inch lift springs. I am running a anti-wrap bar. I have Rancho 5000 shsocks. Also running ARB's front/rear, 350 Chevy V-8, and SM-465 tranny.

    Anyway........here's where I need advice. I have noticed on steep, loose, rocky climbs that my Cruiser gets to "bouncing". I have to come to a stop to get it out of that bouncing mode. I believe it is worse since the SOA, but it was there before the conversion too. What do you think is causing it? Too stiff rear springs? Is the "bounce" affected by tire pressure? Too stiff shocks along with stiff rear springs?

    Your help is appreciated.

  2. Halo3


    Likes Received:
    Oct 11, 2002
    Denver, CO
    I'd have to rule out to the thought of shocks being too stiff. A shock's function is to minimize the "perpetual" bounce one would get if they were driving around with just springs...no shocks. On the flip side, if your shocks were worn out, they would not provide enough resistance to stop the vehicle from bobbing up & down with each & every bump.

    So, it sounds to me like your shocks are worn...
  3. woody

    woody Internet Fireman Staff Member

    Likes Received:
    Jan 15, 2002
    Toquerville UT
    Posasibly the stiff springs combined with too low a tire pressure...the springs don't take the jounce, so the tires load/unload and create it instead.