Author Topic: Help with pinion angle  (Read 6478 times)

Offline 1983c10trb

  • Newbie
  • Posts: 5
  • Newbie
Help with pinion angle
« on: April 06, 2017, 07:24:28 PM »
Hello all. I'm working on a 1983 c10. I installed a belltech flip kit and new leaf springs. The leaf springs are 56" and I've placed the center pin forward. With the drop kit I've now noticed my rear pinion angle is approximately 6 degrees upward and certainly doesn't look right. I have two questions .

Does the center pin on the leaf spring go toward the front?

Is this most likely remedied by using a shim?

Also anyone know how to attach a photo from an iPhone?

Thanks for the input. Love this site.

Offline 1983c10trb

  • Newbie
  • Posts: 5
  • Newbie
Re: Help with pinion angle
« Reply #1 on: April 09, 2017, 04:17:54 PM »
Here's some pics of the drive line angle and the pinion. Is there a way to determine what to set the rear pinion at using the trans output and the ride height? Or is there just a general number of degrees to start with? There's also a pic of the axle and where I'm assuming the shim goes.

Offline Da67goatman

  • Site Supporters
  • Junior Member
  • ******
  • Posts: 757
  • Burban
Re: Help with pinion angle
« Reply #2 on: April 09, 2017, 07:24:37 PM »
Pinion angle needs to be the same as the transmission tailshaft angle or vibration and binding will occur.  Get a cheap angle finder and make them match with pinion shims that go between the axle and spring or in your case the spring and Belltech bracket.
<Pitcrew>
1989 R2500 Suburban mild 350 TBI 700r4 10.5" 14bolt 4.10 w/ 33s
1992 fullsize Blazer 4x4  35s no lift, 4.10s, Hella driving lights, TJ Flares, Huge bumpers, Snorkel, custom interior

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18980
Re: Help with pinion angle
« Reply #3 on: April 10, 2017, 06:37:48 AM »
Your truck needs to be sitting on it's wheels with the bed installed to properly set the pinion angle.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10