OEM rear pinion angle?

[sleepydad]

I need to dial this angle in before I weld stuff... I forgot to measure it and write it down before I cut things apart, DOH! I've never run across it in any Toyota specs.

sitting @ ride height if memory servers I'm thinking 2.5 deg off the transfer output flange?

it's a 2000 limited so the rear drive shaft is a bit shorter than non-limited trucks but I'm thinking that should not matter, just in case it does I mention it.

anybody know? please advise?

 

[Bad Luck]

I need to dial this angle in before I weld stuff... I forgot to measure it and write it down before I cut things apart, DOH! I've never run across it in any Toyota specs.

sitting @ ride height if memory servers I'm thinking 2.5 deg off the transfer output flange?

it's a 2000 limited so the rear drive shaft is a bit shorter than non-limited trucks but I'm thinking that should not matter, just in case it does I mention it.

anybody know? please advise?

I don’t know off the top of my head, but I can take a measurement tomorrow morning with a magnetic angle finder. You need the rear diff pinion angle, correct?

Edit: what are you using to measure angle with?

 

[sleepydad]

I don’t know off the top of my head, but I can take a measurement tomorrow morning with a magnetic angle finder. You need the rear diff pinion angle, correct?

Edit: what are you using to measure angle with?

cool, much appreciated

Yes what is the angle difference between the output flang and rear diff flange.

just have one of those digital angle finder thingies. has magnets, you stick it onto the reference surface, zero it and then stick it to the target surface and it shows the angle.

<a href="https://imgur.com/I12PtMW"><img src="https://i.imgur.com/I12PtMW.jpg" title="source: imgur.com" /></a>

 

[Bad Luck]

cool, much appreciated

Yes what is the angle difference between the output flang and rear diff flange.

just have one of those digital angle finder thingies. has magnets, you stick it onto the reference surface, zero it and then stick it to the target surface and it shows the angle.

<a href="https://imgur.com/I12PtMW"><img src="https://i.imgur.com/I12PtMW.jpg" title="source: imgur.com" /></a>

You’re welcome. That’s essentially the same angle finder I use. Mine is just a different brand.

If I zero it on the frame and then measure the rear pinion flange would that work for you? I want to make sure I get a good measurement for you.

Edit: I’m not sure how much ride height plays into angle measurements. I would guess that the pinion angle changes with ride height and flex. Do you need to know hub to fender heights as well?

 

[sleepydad]

You’re welcome. That’s essentially the same angle finder I use. Mine is just a different brand.

If I zero it on the frame and then measure the rear pinion flange would that work for you? I want to make sure I get a good measurement for you.

Edit: I’m not sure how much ride height plays into angle measurements. I would guess that the pinion angle changes with ride height and flex. Do you need to know hub to fender heights as well?

the way I understand it the output flange on the transfer case is the reference surface. the frame is not necessarily in line with the crank shaft/trans/transfer case.

I can measure it off my other truck, my son being a mobile teenager who has girls on his mind is never home... if I get up early tomorrow he will still be sleeping based on his summer vampire hours.

don't worry about it, I figured if somebody knew it.

I will post back to what I get off that truck.

 

[Bad Luck]

the way I understand it the output flange on the transfer case is the reference surface. the frame is not necessarily in line with the crank shaft/trans/transfer case.

I can measure it off my other truck, my son being a mobile teenager who has girls on his mind is never home... if I get up early tomorrow he will still be sleeping based on his summer vampire hours.

don't worry about it, I figured if somebody knew it.

I will post back to what I get off that truck.

If you change your mind let me know

 

[sleepydad]

4.5 deg is what I get off my other truck, after removing the rear drive shaft. using the transfer case output flange for zero. pinion angle of rear diff flange is 4.5 deg.

 

[G_Raw]

4.5 seems like a lot if you used transfer case flange as 0. Usually you want the TC flange and the third member flange with in a degree or 2 of each other. Anything more and driveline vibes are likely to appear. But see if your measurements work. If not maybe reduce the angle by a few degrees and see if that changes things again.

May also be worth using the frame as 0. Then measure TC flange and third flange. You may find your TC and third to be similar angles that way.

 

[Bad Luck]

4.5 seems like a lot if you used transfer case flange as 0. Usually you want the TC flange and the third member flange with in a degree or 2 of each other. Anything more and driveline vibes are likely to appear. But see if your measurements work. If not maybe reduce the angle by a few degrees and see if that changes things again.

May also be worth using the frame as 0. Then measure TC flange and third flange. You may find your TC and third to be similar angles that way.

With a 3 joint driveshaft (4wd) like we have then you want the rear pinion pointing towards the transfer case output minus about a half degree. If it was a 2 joint driveshaft (2wd) then you want the rear pinion and transfer case output flange to be parallel within a half degree.

That's why rear upper control arms have different lengths between 2wd and 4wd to adjust the pinion angle.

 

[G_Raw]

With a 3 joint driveshaft (4wd) like we have then you want the rear pinion pointing towards the transfer case output minus about a half degree. If it was a 2 joint driveshaft (2wd) then you want the rear pinion and transfer case output flange to be parallel within a half degree.

That's why rear upper control arms have different lengths between 2wd and 4wd to adjust the pinion angle.

You right...:bathbaby:

 

[phattyduck]

With a 3 joint driveshaft (4wd) like we have then you want the rear pinion pointing towards the transfer case output minus about a half degree. If it was a 2 joint driveshaft (2wd) then you want the rear pinion and transfer case output flange to be parallel within a half degree.

That's why rear upper control arms have different lengths between 2wd and 4wd to adjust the pinion angle.

Bingo. The absolute angle on the 4WD rear shaft doesn't matter much, it just needs to point (basically) at the rear output flange.

I'm just glad I read/figured out the rear upper arm length issue before I scraped my parts truck!

-Charlie

 

[sleepydad]

Bingo. The absolute angle on the 4WD rear shaft doesn't matter much, it just needs to point (basically) at the rear output flange.

I'm just glad I read/figured out the rear upper arm length issue before I scraped my parts truck!

-Charlie

well I learned something today then, did not know the uppers were different length on 4wd and 2wd. makes sense.

 

[sleepydad]

4.5 seems like a lot if you used transfer case flange as 0. Usually you want the TC flange and the third member flange with in a degree or 2 of each other. Anything more and driveline vibes are likely to appear. But see if your measurements work. If not maybe reduce the angle by a few degrees and see if that changes things again.

May also be worth using the frame as 0. Then measure TC flange and third flange. You may find your TC and third to be similar angles that way.

just to be clear I used the flanges to measure the angle. because it would seem to me the only thing that really matters are the flanges when it comes to pinion angle.

if it was a simple shaft having dead nuts on 0 deg difference is best, one you have differences the motion is no long a circle and it's an elipse and you have vibrations.

But like others have said having the double cardan helps to compensate for more angle.

the proof will be driving down the road and see how things seem.

I wanted to do whatever Toyota did because they are usually right when it comes to 3rd gens. many of us have tried to outdo the Toyota engineers and have failed.