Need pictures of ....

[Hart_Rod]

.... installed rear pinon adjustment shims. TIA

R/

[dirtball]

Kind of hard to get a picture of, they are just sandwiched between the bearing and the base of the helical cut gear. Does that make sense?

[faribran]

Rob,
are you playing with a rear end?

[project 67 sub]

Originally Posted by dirtball

Kind of hard to get a picture of, they are just sandwiched between the bearing and the base of the helical cut gear. Does that make sense?

i believe he is talking about the wedge shaped shims that go between the trailing arms and the rear end mounting perch to adjust the pinion angle to the right degree

[dirtball]

Originally Posted by project 67 sub

i believe he is talking about the wedge shaped shims that go between the trailing arms and the rear end mounting perch to adjust the pinion angle to the right degree

Gotcha! I was thinking pinion depth, not angle.

[project 67 sub]

haha no problem lol.

[SCOTI]

Originally Posted by Hart_Rod

.... installed rear pinon adjustment shims. TIA

R/

What specifically are you looking for?

[PBFAB.COM]

http://www.stockcarproducts.com/trkarm1.htm

[Hart_Rod]

Originally Posted by SCOTI

What specifically are you looking for?

Do you have any pictures of your shims installed? I just want to make sure I put them in the correct way......

[SCOTI]

They go between the rear-end housing 'pad' & the truck arm 'pad'. Which direction depends on which way you're trying to go. Mine are installed to yield 3° positive pinion angle.

The 1st pic is a 3/4 view from the front of the housing (driver side). 2nd pic is a 3/4 view from behind the housing (again driver side). Also note a little subliminal PB endorsement ....

[Hart_Rod]

Originally Posted by porterbuilt

http://www.stockcarproducts.com/trkarm1.htm

Nate - those are the ones I ordered. I just wanted to make sure I was installing them correctly.....

Originally Posted by SCOTI

They go between the rear-end housing 'pad' & the truck arm 'pad'. Which direction depends on which way you're trying to go. Mine are installed to yield 3° positive pinion angle.

The 1st pic is a 3/4 view from the front of the housing (driver side). 2nd pic is a 3/4 view from behind the housing (again driver side). Also note a little subliminal PB endorsement ....

Thanks Scoti. Any shots of the transmission and driveline to see your angles?

[dznucks]

I dont want to hi-jack Rob's thread, but would like to add more discussion to this topic.

When setting the pinion angle on a leaf spring rear, you allow for flex in the leafs so that the pinion angle matches the tranny angle while under load.

Since our trucks use trailing arms and dont flex (much), are you guys allowing for any extra degrees or are you matching your pinion angle equal and opposite of the tranny angle?

I almost bought those shims from stock car products, but had my cpp drop block machined so my pinion angle is the same angle as my tranny instead.

[SCOTI]

Originally Posted by Hart_Rod

Nate - those are the ones I ordered. I just wanted to make sure I was installing them correctly.....



Thanks Scoti. Any shots of the transmission and driveline to see your angles?

I haven't gotten the drivetrain in yet but my plan is to adjust the height @ the trans x-member if needed.

[Hart_Rod]

Originally Posted by dznucks

I dont want to hi-jack Rob's thread, but would like to add more discussion to this topic.

When setting the pinion angle on a leaf spring rear, you allow for flex in the leafs so that the pinion angle matches the tranny angle while under load.

Since our trucks use trailing arms and dont flex (much), are you guys allowing for any extra degrees or are you matching your pinion angle equal and opposite of the tranny angle?

I almost bought those shims from stock car products, but had my cpp drop block machined so my pinion angle is the same angle as my tranny instead.

I will probaby do the same thing once I figure out the correct angle.

Originally Posted by SCOTI

I haven't gotten the drivetrain in yet but my plan is to adjust the height @ the trans x-member if needed.

Roger that. I also notices that you flipped the trailing arm mounting brackets on your ECE crossmember. How much does that help on the pinion angle?

[SCOTI]

Originally Posted by Hart_Rod

I will probaby do the same thing once I figure out the correct angle.




Roger that. I also notices that you flipped the trailing arm mounting brackets on your ECE crossmember. How much does that help on the pinion angle?

I didn't do before/after documentation.

But, my 68 had the same basic set-up (but the rear clip was in the OE location), & I know my pinion was not optimum w/the factory orientation (it was driveable w/o vibration using a 1:1 final drive ratio, but not optimum). Since this truck is getting OD, I wanted to ensure the angles are correct because I can't stand driveline vibration & it becomes much more prominent w/OD. With the rear clip raised 3" vs OE, I needed the front pivot point raised a similar amount.

Flipping the mounts raised the pivot point approx .500-.750" vs. OE placement of the rails.

[Mechanic77]

Originally Posted by dznucks

I dont want to hi-jack Rob's thread, but would like to add more discussion to this topic.

When setting the pinion angle on a leaf spring rear, you allow for flex in the leafs so that the pinion angle matches the tranny angle while under load.

Since our trucks use trailing arms and dont flex (much), are you guys allowing for any extra degrees or are you matching your pinion angle equal and opposite of the tranny angle?

I almost bought those shims from stock car products, but had my cpp drop block machined so my pinion angle is the same angle as my tranny instead.

+1, I had the same question...I'm almost ready to weld my axle perches (sp?) on to my rearend and was wondering if you just set the pinion angle equal and opposite of the tranny angle? Because I'm putting a different rearend in and welding the perches on, I have the option of putting the pinion angle wherever it needs to be.

[SCOTI]

If using a 1pc driveshaft, I think the 'opposite angles' is what's common.

[PBFAB.COM]

Originally Posted by Mechanic77

+1, I had the same question...I'm almost ready to weld my axle perches (sp?) on to my rearend and was wondering if you just set the pinion angle equal and opposite of the tranny angle? Because I'm putting a different rearend in and welding the perches on, I have the option of putting the pinion angle wherever it needs to be.

With the one piece drive-shaft it is recommended that you do not match the angle "exactly" but that you allow a 1* difference to allow just enough oscillation for the u-joints to lubricate properly. If you set the angles equal and opposite on the nose, you will have some premature u-joint wear as they will not lubricate properly.

[dznucks]

it is recommended that you do not match the angle "exactly" but that you allow a 1* difference

do you mean the angle should be one degree less than or greater than the tranny angle?

ie. if the tranny is at 4* down, should the pinion be 3* up or 5* up?

[Hart_Rod]

Originally Posted by dznucks

do you mean the angle should be one degree less than or greater than the tranny angle?

ie. if the tranny is at 4* down, should the pinion be 3* up or 5* up?

Here's a good link and a picture...

http://67-72chevytrucks.com/vboard/s...g+pinion+angle

[jmedero]

This will be fun to figure out on mine. How does this relate to a two piece drive shaft? Once I get panhard bar mount done this is next.
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