10-10-2012, 08:04 PM
Well, it only took me 2 years, but I finally got the Bronco on an RTI ramp since theinstallation of the Duff's 4-link.
If you recall, we did an initial RTI measurement with the prior suspension for comparison. The test was performed on a 20* ramp. We tested the front driver's side and then the rear driver's side using the formula RTI dist / wheelbase x 1000. The front had an RTI of 608 (56/92x1000) and the rear 489 (45/92x1000). This was with 5.5" suspension lift with 35" tires.
Today, we tested the 4-link using the same RTI ramp and formula. The front scored 1117 (105/94x1000) and the rear 1160 (109/94x1000). Now we did move the rear axle back 2" which was accounted for in the calculation. Unfortunately, the rear outboard shocks have been an issue since day one. Next week I plan to eliminate the lower tabs on the truss and fab new ones on the lower part of the axle tube. This should give me the needed travel / compression to prevent crunching more shocks.
Once I create the new mounts and verify it fixes the issue, I will have to get new shocks from Duffs since mine were destroyed from bottoming out.
More to come...
![[Image: PART_1349908674321.jpg]](http://i288.photobucket.com/albums/ll176/mchuzie/PART_1349908674321.jpg)
If you recall, we did an initial RTI measurement with the prior suspension for comparison. The test was performed on a 20* ramp. We tested the front driver's side and then the rear driver's side using the formula RTI dist / wheelbase x 1000. The front had an RTI of 608 (56/92x1000) and the rear 489 (45/92x1000). This was with 5.5" suspension lift with 35" tires.
Today, we tested the 4-link using the same RTI ramp and formula. The front scored 1117 (105/94x1000) and the rear 1160 (109/94x1000). Now we did move the rear axle back 2" which was accounted for in the calculation. Unfortunately, the rear outboard shocks have been an issue since day one. Next week I plan to eliminate the lower tabs on the truss and fab new ones on the lower part of the axle tube. This should give me the needed travel / compression to prevent crunching more shocks.
Once I create the new mounts and verify it fixes the issue, I will have to get new shocks from Duffs since mine were destroyed from bottoming out.
More to come...
'77 351w- Explorer EFI, 4R70W, 4-link, lockers, 4.56, 35" MT/Rs with a severe rock addiction.
mokin:
Roads? Where we're going, we don't need roads.
![[Image: sig2.jpg]](http://i288.photobucket.com/albums/ll176/mchuzie/sig2.jpg)
mokin:Roads? Where we're going, we don't need roads.