CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
July 29, 2014, 09:45:52 AM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
102447 Posts in 12090 Topics by 4668 Members
Latest Member: Carbuff
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  General Discussion
| | |-+  factory 1969 12 bolt pinion angle
« previous next »
Pages: [1] 2  All Print
Author Topic: factory 1969 12 bolt pinion angle  (Read 6222 times)
hdptsr
Newbie
*
Posts: 15


View Profile
« on: December 03, 2010, 02:34:04 AM »

I have a 1969 SS (350 300HP) car with a factory 12 bolt.  The owner prior to me changed the multi leaf perches to mono.  I want to weld multi perches back on however would like to know the correct pinion angle that the spring perches were welded to the axle tubes at the factory.  With the spring perches level what is the correct down angle in degrees of the pinion? (out of the car) Thanks Joe
Logged
mark x22
Member
***
Posts: 131


View Profile
« Reply #1 on: December 03, 2010, 05:59:02 AM »

Logged
hdptsr
Newbie
*
Posts: 15


View Profile
« Reply #2 on: December 03, 2010, 11:37:07 AM »

So the spring perches should be welded on the axle tubes with the pinion pointed down 6 degrees? 
Logged
JohnZ
CRG Member
*****
Posts: 4043


View Profile Email
« Reply #3 on: December 03, 2010, 02:13:41 PM »

So the spring perches should be welded on the axle tubes with the pinion pointed down 6 degrees? 

With the spring mating surface on the perches horizontal, the pinion centerline should be 6* UP from horizontal.
Logged

'69 Z/28
Fathom Green
CRG
mark x22
Member
***
Posts: 131


View Profile
« Reply #4 on: December 03, 2010, 02:38:58 PM »

same drawing rotated like John said .
Logged
rodent
Member
***
Posts: 55


View Profile
« Reply #5 on: December 03, 2010, 03:27:47 PM »

Spring perches turned inward at 2
Logged
hdptsr
Newbie
*
Posts: 15


View Profile
« Reply #6 on: December 03, 2010, 05:21:36 PM »

Man I am really confused about what pinion angle I should weld the spring perches on.  I emailed Moser and they said 6 degrees down (negative) then I e-mailed Currie rear ends and this was his reply.... he asys 5 degrees up (positive was the way they came from the factory

Darrell Schwaiger" <darrell@currieenterprises.com>  No vehicle (besides some very odd Dodge cars) had the pinion pointed towards the floor from level. The transmissions are going to be higher than the rearend, it needs to point upward. The numbers I gave you are the numbers we build all of our axles to for that vehicle.

Somebody please straighten me out on this so I can get to welding Smiley
Logged
KevinW
Member
***
Posts: 406


View Profile Email
« Reply #7 on: December 04, 2010, 07:30:27 AM »

Just go find a junk chevy rear from the mid 70s to compare.  The pinion angles are all the same mono or multi for that era.
Logged
mopar346
Member
***
Posts: 315


View Profile Email
« Reply #8 on: December 04, 2010, 09:02:28 AM »

It is defintiely up, although I could not have quoted the degree with out researching it. They have posted a technical drawing from I'm sure a factory source, so I would believe it just based on what I know. If you think about it as you excellerate the pinion goes up to essentially align the drive line. Consider any ride heigth over stock you are going to have as well to ensure nothing changes. They do make degreed shims in I think 2 and 4 degrees in the case that you get it off a little you can correct it with out cutting and rewelding. I use to use these shims to prelaod my J bolt bars fort 2 degrees.

I usually jig everything up on tires and all to ensure angles and centering is correct, once I have everything like I want it I tack it in place and then pull it and weld everything.

And don't be talking about old Dodge cars. Angry

Good luck
« Last Edit: December 04, 2010, 10:08:54 AM by mopar346 » Logged
JKZ27
Member
***
Posts: 257



View Profile Email
« Reply #9 on: December 04, 2010, 09:24:16 AM »

Also consider the mounting point on the leaf spring. I think when the axle is mounted on the springs, it actually puts the pinion closer to level when the perches are welded with the pinion up about 6*. So, the down position would seem wrong to me. When power is applied to the axle, it tends to rotate so the pinion moves up.

John
Logged

69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20
79 Z28 Brown LM1 M21
04 SRT 10
mark x22
Member
***
Posts: 131


View Profile
« Reply #10 on: December 04, 2010, 10:13:57 AM »

With the pinion level which also puts the rear cover mounting surface 90 degrees straight up , the spring perch's point down in the front 6 degrees like the drawings show . With your first question with the perch's level the pinion goes up 6 degrees in the front like in the second drawing
« Last Edit: December 04, 2010, 11:48:16 AM by mark x22 » Logged
mark x22
Member
***
Posts: 131


View Profile
« Reply #11 on: December 04, 2010, 10:17:58 AM »

This is the 2 degrees Rodent was talking about .               
Logged
mopar346
Member
***
Posts: 315


View Profile Email
« Reply #12 on: December 04, 2010, 10:20:30 AM »

Excellent point, that may be the confusion. Up from perch level down from drive line angle.
Logged
mopar346
Member
***
Posts: 315


View Profile Email
« Reply #13 on: December 04, 2010, 10:25:13 AM »

Good illustrations, out of the Assemble Manual ya'll keep talking about?
Logged
mikes 67
Newbie
*
Posts: 10


View Profile Email
« Reply #14 on: December 04, 2010, 10:26:09 AM »

The springs do not sit level in the car. If you measure from the ground up to the front eye of the spring, then measure from the ground up to the rear eye of the spring  you will find the rear sits about 7 inches higher.
  The correct way to set the pinion angle is with the rear end in the car.  Set jack stands under the rear springs so they are holding all the weight of the car,set your new perches on the springs then set your axle housing on the perches.  using an angle finder measure the angle of the output of the transmission then set the pinion angle a couple of degees down from that. Center the housing from side to side and tack the new perches in place, then remove the rear end and finish welding out in the open.
   I hope this helps,  Mike.
Logged
Pages: [1] 2  All Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.082 seconds with 17 queries.