dSINtia
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Hi guys.
I recently wrapped up a V8 conversion in my 2WD B2 and although the stock 7.5" rear end seemed to handle the torque of the V8 well, I opted to swap in an Explorer 8.8" axle with LS 3:73 gears and disc brakes.
After stripping the B2 of stock parts and preserving the underside of the vehicle and rebuilding, preserving and painting the 8.8" axle I 'THOUGHT' I was ready to weld the new RuffStuff spring perches in and get the axle mounted.
I put the vehicle at ride height with the suspension loaded, took my measurements and tacked it all in place. I am 3.0 degrees down (87 degrees) at the transmission and exactly at 90 degrees (or 0 degrees if you prefer that perspective) at the pinion giving me -3 degrees to allow for axle wrap as I'm still at stock ride height with stock leaf springs. I do have air bags installed just forward of the spring plates though.
Anyhow, I weld everything up, retake my measurements and all my angles are the same leaving me down 3 degrees at the pinion from parallel with a 15 degree drive shaft angle. The drive shaft and u-joints are new with a slip yoke at the trans and the 8.8 flange at the pinion end.
I have horrible vibration/knocking even at idle speed - I haven't even dared take it over 10 or 15 MPH.
What have I done wrong? Did I give it too much negative pinion angle over-compensating for less than expected axle wrap? What should I do to correct it? Shims? In front of or behind the axle?
I thought I understood all this pinion angle stuff but apparently I'm not quite as savvy as I thought... any help is greatly appreciated!
Thanks.
Dave
I recently wrapped up a V8 conversion in my 2WD B2 and although the stock 7.5" rear end seemed to handle the torque of the V8 well, I opted to swap in an Explorer 8.8" axle with LS 3:73 gears and disc brakes.
After stripping the B2 of stock parts and preserving the underside of the vehicle and rebuilding, preserving and painting the 8.8" axle I 'THOUGHT' I was ready to weld the new RuffStuff spring perches in and get the axle mounted.
I put the vehicle at ride height with the suspension loaded, took my measurements and tacked it all in place. I am 3.0 degrees down (87 degrees) at the transmission and exactly at 90 degrees (or 0 degrees if you prefer that perspective) at the pinion giving me -3 degrees to allow for axle wrap as I'm still at stock ride height with stock leaf springs. I do have air bags installed just forward of the spring plates though.
Anyhow, I weld everything up, retake my measurements and all my angles are the same leaving me down 3 degrees at the pinion from parallel with a 15 degree drive shaft angle. The drive shaft and u-joints are new with a slip yoke at the trans and the 8.8 flange at the pinion end.
I have horrible vibration/knocking even at idle speed - I haven't even dared take it over 10 or 15 MPH.
What have I done wrong? Did I give it too much negative pinion angle over-compensating for less than expected axle wrap? What should I do to correct it? Shims? In front of or behind the axle?
I thought I understood all this pinion angle stuff but apparently I'm not quite as savvy as I thought... any help is greatly appreciated!
Thanks.
Dave