by AzDon Mon Jun 28, 2021 11:13 am
Got the posi axle installed and set it up to use 4 shocks if I want to, or I can stagger them like third gen.... I also got the trans crossmember painted and bolted up......I hooked up the posi's e-brake setup to my clutch pedal and hooked up the hydraulic brake lines....


This picture shows the new driveshaft and above it the bracket that holds the e-brake cable collar....... and above that, the thru-frame sleeve top shock mount and you can see where the bottom of both a front and rear shock can mount to the axle....
I set the engine/trans at a 2.3 degree angle to the ground and the posi pinion shaft is at 2 degrees up.....The driveshaft is 17.5" cup2cup and has a 1.125" incline which is 3.8 degrees up to the trans....This incline will flatten some when the van has gas in it, tools, spare tire and interior in the rear...... It has .3 degrees factored in at the diff for "spring wrap" under acceleration (probably unnecessary)
The forward rake is 4.4 degrees and the caster angle is 4 degrees positive (so 8.4 degrees if there was zero forward rake)..... The final choice of front/rear tire sizing may change the caster number...... All degrees shown are measured from a zero angle concrete garage floor with a weighted digital protractor gauge...

Posi with leaf pads and shock mounts welded before black paint...

Here is the heim link I made to pull the ebrake cable with the clutch pedal arm.....The cable I used is for a 83 s10....

Modified third-gen trans crossmember with frame brackets for vertical adjustment and a forward extension (blue) for the 700r4 mount

frame mount for crossmember...
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Brake lines...

E-brake cable cuff bracket... The 91 posi has a unique setup where the right cable's cuff is anchored and the cable is pulled by the left (black) cable's cuff.... The left cable is pulled by the clutch pedal..... The tension is adjusted for everything where the end of the right cable hooks onto the left cable's cuff...
Also, you can see the front shock thru-sleeve above....

Here is my "Big rig" 18 inch steering wheel and the e-brake rod that holds the clutch pedal down for parking.... This rod goes under the seat while driving.....clutch pedal provides cable brakes while middle pedal is hydraulic brakes....BOTH pedals for panic stops!