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Re: [GMCnet] Setting the front ride height procedure [message #292884 is a reply to message #292860] Thu, 24 December 2015 16:18 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Senior Member
Scott,

On this rare occasion I am going to disagree with me Mate, Ken! ;-) Below you will find what the manual(s) note. I think it's best
that they be followed carefully.

THE FOLLOWING CUT AND PASTED FROM X-7525 / SECTION 3A FRONT SUSPENSION / PAGES 3A-19 & 20:

RIDE HEIGHT
When checking front ride height, have the vehicle parked on a known level surface, and tire pressure at specified psi.

NOTE: For details on adjusting rear ride height refer to Section 4, REAR SUSPENSION. If vehicle is equipped with the optional Power
Level System, be sure power level control knobs are set in the "TRAVEL" position prior to adjusting front ride height Measurements
must be taken from the top of oval hole in the frame rail to the floor (figure 31).

NOTE: Never attempt to increase the ride height of the vehicle using the adjusting bolt only, (figure 30). The bolt will turn but
will strip threads and will necessitate replacement of the bolt. Always use special tool.

RIDE HEIGHT ADJUSTMENT

NOTE: Tool J-22517-02 (shown in figure 16) must be used the reset ride height. This tool will raise or lower the torsion bar rear
anchor arm so that the adjusting bolt is not loaded.

1. Install Tool J-22517-02 with pin of tool aligned into hole in crossmember. Seat center screw in dimple of torsion bar adjusting
arm.

2. If vehicle must be raised, turn tool until proper adjustment level is reached, then turn the adjusting bolt until it makes
contact with the adjusting arm. Remove tool.

3. If vehicle is to be lowered, raise adjusting arm from contact with adjusting bolt. Lower bolt then lower arm with tool until
proper ride height level is reached. Raise bolt to contact adjustment arm. Remove tool.


THE FOLLOWING IS CUT AND PASTED FROM X-7625 / SECTION 3A - FRONT SUSPENSION / PAGE 3A-19

RIDE HEIGHT
When checking front ride height, have the vehicle parked on a known level surface, and tire pressure at specified psi.

NOTE: For details on adjusting rear ride height refer to Section 4, REAR SUSPENSION.

If vehicle is equipped with the optional Electro-Level System, be sure power level control switches for right and left hand side of
vehicle are in "OFF" position. Set center switch to "TRAVEL AUTO" position prior to adjusting front ride height.

Measurements must be taken from the top of oval hole in the frame rail to the floor (figure 21).

NOTE: Never attempt to increase the ride height of the vehicle using the adjusting bolt only (figure 22). The bolt will turn but
will strip threads and will necessitate replacement of the bolt. Always use special tool

RIDE HEIGHT ADJUSTMENT (Figure 21)

NOTE: Tool J-22517-02 (shown in figure 20) must be used the reset ride height. This tool will raise or lower the torsion bar rear
anchor arm so that the adjusting bolt in not loaded.

1. Install Tool J-22517-02 with pin of tool aligned into hole in crossmember. Seat center screw in dimple of torsion bar adjusting
arm.

2. If vehicle must be raised, turn tool until proper adjustment level is reached, then turn the adjusting bolt until it makes
contact with the adjusting arm. Remove tool.

3. If vehicle is to be lowered, raise adjusting arm from contact with adjusting bolt. Lower bolt, then lower arm with tool until
proper ride height level is reached. Raise bolt to contact adjustment arm. Remove tool

MANUAL X-7725 SAYS ESSENTIALLY THE SAME THING AS X-7625.

Regards,
Rob M.
The Pedantic Mechanic


-----Original Message-----
From: Scott Nutter

Ken Burton's technique sounds more like the way the manual describes the procedure. The shop manual does not mention any steps of
raising the front end. Also, all the informational videos on YouTube show the wheels on the ground during adjustments. Although the
videos were all GMC trucks.

So, being my first time, I am going to err on the safe side. I will set the front ride height with the wheels OFF the ground. Once
I'm under the coach I can actually get a better idea of what's going down there and the amount of force actually on the unloader
tool. Then after the first test drive, I will fine tune the front height with the wheels ON the ground if I think I can do it
safely. I will also try to post the end results with pictures.
Scott


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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