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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Help with Driveline Angles on my Hot Rod - Pictures inside...
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Topic Review (Newest First)
12-05-2012 12:29 PM
mason71
Quote:
Originally Posted by NEW INTERIORS View Post
From the angle we are looking at your angle finder,, If we seen it from the side it look's to be 5*.. Is that right ??? We are seeing it from a angle,, Not dead on..
Its closer to 8*, it was kinda hard to take the picture and hold the angle finder
12-05-2012 11:07 AM
NEW INTERIORS From the angle we are looking at your angle finder,, If we seen it from the side it look's to be 5*.. Is that right ??? We are seeing it from a angle,, Not dead on..
12-05-2012 11:04 AM
1971BB427
Quote:
Originally Posted by mason71 View Post
I am running a four link.
Perfect! Then get it close, and you can do any adjustment after a test drive, if needed.
12-05-2012 11:02 AM
NEW INTERIORS
Quote:
Originally Posted by mason71 View Post
I am running a four link.

You have adjustment on the bars to change the pinion angle IF you have any problems.. (I don't see where you would).. Low ride trucks go down the hwy dropped as low as they can run with the rear end higher then the trans everyday with no problems other then dragging the ground...

If it was Mine I would set the carbs level, Set the rear end 3* up to match the 3* down and move on... You start lifting the trans then the motor look's like it is taking a nose dive... If you want to lift the trans.. Lift the motor as well, (Keep the carb level)..Here's a shot of the truck we built for my son... You can't see the true angle of the drive shaft.. But when its aired down the rear end is as high as your's..And he can run all day long like that..
12-05-2012 09:54 AM
NEW INTERIORS
Quote:
Originally Posted by prostreet6t9 View Post
Very true.. Except the diff will always tilt up under power. How much will depend on the suspension.

Don't be leaving all mad Randy
Well.. I hope you understand that will only happen on a leaf spring set up.. 4 BAR ,Ladder bar, And for link,, the rear end doesn't change.. Only The angle of the drive shaft will a little..

And I'm not mad... I feel if he believe's denny,, Go with it..
12-05-2012 09:05 AM
timothale
rear end tilt

Rear end tilt during suspension movement will depend on your suspension design, length and location of the locators. whether they be leaf springs. parallel, equal length 4 bar. canted shorter upper bars. nascar 2 bar, with the design you use you can have the pinion angle stay parallel, point up or down during movement. With some suspensions having the pinion down at rest, it will point the pinion up under acceleration as the rear of the car squats thus having the u joints nearer optimum angle DURING Full power, mock it up or work on the drafting table with a ruler and compas drawing arcs.
12-05-2012 08:31 AM
prostreet6t9
Quote:
Originally Posted by NEW INTERIORS View Post
So you think that makes a difference..
A drive shaft has two u-joints on it.. It doesn't know what end is what..

I'm done here..Like I said good luck..
Very true.. Except the diff will always tilt up under power. How much will depend on the suspension.

Don't be leaving all mad Randy
12-05-2012 07:25 AM
mason71
Quote:
Originally Posted by 1971BB427 View Post
The question I have is what will your rear suspension setup be? Is it going to be adjustable for pinion angle, or fixed? If it's an adj. 4 link or ladder bar, then you'll be able to dial it in to tune it. If not then it needs to be pretty spot on to start with.
I had my pinion nose down a couple degrees too much, and it drove great around town, but vibrated pretty good at around 55-65 mph. A small adjustment on my ladder bars to bring the pinion up and it all went away.
I am running a four link.
12-05-2012 07:14 AM
AutoGear Make sure things are phased properly when you decide on your angles.
12-04-2012 10:18 PM
NEW INTERIORS
Quote:
Originally Posted by prostreet6t9 View Post

The differentials all always lower than what they're connecting to.
So you think that makes a difference..
A drive shaft has two u-joints on it.. It doesn't know what end is what..

I'm done here..Like I said good luck..
12-04-2012 09:57 PM
prostreet6t9
Quote:
Originally Posted by NEW INTERIORS View Post
I have had some with a good bit of angle on them with no problems... Look at most of the 4x4's with way more angle on them... And the u-joints don't go out like some say... I had a 1979 4x4 blazer and it was very high,, I could not touch the roof standing on side of it.. And I'm 6'... Never had problems with u-joints.. So I would tack everything in place at ride height and spin the back wheels with the drive shaft hooked up and see how it feels.. But from what I see.. I would build it.. I don't see it being that bad from the pictures..
Sounds like a nice truck I build shafts for those big trucks in all the time and your correct they're not bad on joints.

The differentials all always lower than what they're connecting to.
12-04-2012 09:48 PM
prostreet6t9 [QUOTE=mason71;1619133]
[U]Denny: With short driveshafts it is very important to have everything inline and no offset at all.

You will need to install a rear end that has the pinion in exactly the right place to allow for a straight line from pinion to trans.

Thats what I was talking about.. Your diff is "above" the center line. With a short shaft you could be setting yourself up for shakes.

I get rods in that have a offset side to side since the 8.8 is so popular and most of them are fine.

It's the up and down I worry about.
12-04-2012 07:47 PM
NEW INTERIORS Maybe you should believe Denny.. Good luck..
12-04-2012 07:19 PM
1971BB427 The question I have is what will your rear suspension setup be? Is it going to be adjustable for pinion angle, or fixed? If it's an adj. 4 link or ladder bar, then you'll be able to dial it in to tune it. If not then it needs to be pretty spot on to start with.
I had my pinion nose down a couple degrees too much, and it drove great around town, but vibrated pretty good at around 55-65 mph. A small adjustment on my ladder bars to bring the pinion up and it all went away.
12-04-2012 07:07 PM
mason71 I emailed Dennys Driveshafts and he felt like I would have some issues especially with the shorter than normal shaft.

I am going to raise my transmission to help reduce my angles as much as possible. Here is our conversion:

Denny: With short driveshafts it is very important to have everything inline and no offset at all.

You will need to install a rear end that has the pinion in exactly the right place to allow for a straight line from pinion to trans.

Me: While measuring a little more I realized the over head net difference is more like 1.25" due to my engine and transmission being mounted offset.

I am planning to go ahead and use this rear end. I was thinking about bringing the transmission up to decrease the driveshaft angle.

Any thoughts? Thanks!

Denny: Get your angles as little as possible so the total amount of offset will not cause too bad of a vibration. Technically you should have vibration with that short shaft and compound angle. You might get lucky and the offset may not react so badly.
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