Advertisement
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Home Who's Online Today's Posts HP Calculator CompD Gift Shop Mark Forums Read
Go Back   Competition Diesel.Com - Bringing The BEST Together > The Starting Line > Competition Vehicle Build Tech > Chassis, Suspension and Driveline
Register Members List Timeslips EFI Live Library Invite Your Friends FAQ Calendar Mark Forums Read

Closed Thread
 
Thread Tools
Old 02-06-2017, 09:05 PM   #1
9 LIVES
 
9 LIVES's Avatar

Name: 9 LIVES
Title: Demolition Expert
Status: Here
Join Date: Oct 2006
Location: Midland, NC
Member`s Gallery
Posts: 3,715
Pinion angle ?

I have lowered my dodge 2500 single cab short bed about 4" in the rear. I did this with a spring over.....now after looking at the pinion angle I think I fubared it up a bit and didn't think this project through

Anyone have an idea of what the pinion angle should be on a 2X4 2500 ? My rear end is pointing downwards a bit. Is the goal to have the driveshaft as straight of a shot to the transmission as possible?
__________________
2001 F-350 12V Fummins
1995 Dodge 2500 SCSB 12V
2012 Dodge 3500
1994 Dodge 2500

Heads I win, tails you lose....
-Lee-
 
Old 02-06-2017, 10:41 PM   #2
cumminspa75
 
cumminspa75's Avatar

Name: cumminspa75
Title: Too Much Time
Status: Not Here
Join Date: Mar 2010
Location: Knox, Pa
Member`s Gallery
Posts: 300
Is your pinion angle at the rear end more than -2 degrees?
__________________
Jordan
07.5 3500 6.7, 68rfe
Quote:
Originally Posted by ISBand4BT View Post
I'm kinda unsure... It'd be like a glory hole, it's either gonna be good or ur gonna get bit.
 
Old 02-07-2017, 12:33 AM   #3
Tate
 
Tate's Avatar

Name: Tate
Title: What?
Status: Not Here
Join Date: Nov 2007
Location: Airdrie, Alberta
Member`s Gallery
Posts: 3,322
You want the pinion angle at the same angle as the engine/tranny in your average running condition. So with leafs, you'd want a degree or two down of that. IIRC, my engine was around 5 degrees down, so you might want 3 degrees up on the pinion, so when you apply power, it'll rotate up to around 5 degrees. The goal being the u-joints at each end are operating at the same angle.
__________________
'98 3500 2wd, 24v, 5 spd, p-pumped
'98 2500 4wd, 12v, 6 spd, VP'd
'02 VW Jetta, 5 spd.

My p-pump conversion pics
 
Old 02-15-2017, 01:55 PM   #4
Ryan Tucker
 
Ryan Tucker's Avatar

Name: Ryan Tucker
Title: Do it Dont talk about it.
Status: Not Here
Join Date: Aug 2014
Member`s Gallery
Posts: 255
Keep going down tell she bites.

Get the rear as low as poss, really lighten up the rear spring rate, pay attention to transfer
 
Old 02-15-2017, 02:35 PM   #5
CorneliusRox
 
CorneliusRox's Avatar

Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Minneapolis, MN
Member`s Gallery
Posts: 3,191
For the rear you want the pinion angle at the exact same angle as the transfer case output. Anything more than 2deg off will kill your u-joint life and hurt traction (since it'll pulse your rear wheels).

For the front, since it's a double cardan, you want your pinion angle to match the driveshaft angle (so it's parallel with the driveshaft).

Click the image to open in full size.
__________________
12V - Thumper
Corey - BSME
97 12V Michigan Rust Bucket
 
Old 02-15-2017, 06:51 PM   #6
9 LIVES
 
9 LIVES's Avatar

Name: 9 LIVES
Title: Demolition Expert
Status: Here
Join Date: Oct 2006
Location: Midland, NC
Member`s Gallery
Posts: 3,715
See my diff aims down a couple degrees. Being 2WD I don't have to worry about a transfer case.

Where should I measure pinion angle from? What is the proper way?
__________________
2001 F-350 12V Fummins
1995 Dodge 2500 SCSB 12V
2012 Dodge 3500
1994 Dodge 2500

Heads I win, tails you lose....
-Lee-
 
Old 02-15-2017, 07:26 PM   #7
K204DR
 
K204DR's Avatar

Name: K204DR
Title: I'm the Driver
Status: Not Here
Join Date: Jun 2008
Location: TN
Member`s Gallery
Posts: 768
at the yoke, should be the same as the transfercase or trans yoke. envision it with no driveshaft, and the ends should be pretty much parallel. its ok to have it 1-1.5 degrees down as it will pull up under load.
__________________
88 Chevy crewcab 95 6bt nv4500 valair clutch
72 scout II 4BT TH400 1TONS
 
Old 02-15-2017, 10:46 PM   #8
biggy238
 
biggy238's Avatar

Name: biggy238
Title: Too Much Time
Status: Here
Join Date: Aug 2008
Location: Just North of Wrong
Member`s Gallery
Posts: 6,944
Quote:
Originally Posted by CorneliusRox View Post
For the rear you want the pinion angle at the exact same angle as the transfer case output. Anything more than 2deg off will kill your u-joint life and hurt traction (since it'll pulse your rear wheels).

For the front, since it's a double cardan, you want your pinion angle to match the driveshaft angle (so it's parallel with the driveshaft).

Click the image to open in full size.
Front joint still needs operating angle to lube and not wear the caps.

Sent from my XT1575 using Tapatalk
__________________
Google site:competitiondiesel.com for the gnawlidge.

05.5 Campanella White TDi Jetta 5spd 45.5MPG
-Little Sexy
96 Ext Cab Ram 2500 Long Bed, Test Pig/Science Experiment
- Big Nasty
 
Old 02-16-2017, 09:06 AM   #9
CorneliusRox
 
CorneliusRox's Avatar

Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Minneapolis, MN
Member`s Gallery
Posts: 3,191
Quote:
Originally Posted by 9 LIVES View Post
See my diff aims down a couple degrees. Being 2WD I don't have to worry about a transfer case.

Where should I measure pinion angle from? What is the proper way?
I've got a digital level with a magnet on it. I find a way to get it flat and measure. I'm not super familiar with 2WD stuff, but if it's got a slip spline, you could pull that out a bit and put it on there. That's typically what I do. If it's a yoke/bolted on strap setup, you can just get a piece of angle iron, trill a couple holes, mount it, and then use that as your flat/parallel surface (just make sure the angle iron is actually at 90deg).

Quote:
Originally Posted by biggy238 View Post
Front joint still needs operating angle to lube and not wear the caps.
That's normally covered laterally by the manufacturer. The t-case output is typically not exactly in line with the differential.
Good point though!
__________________
12V - Thumper
Corey - BSME
97 12V Michigan Rust Bucket
 
Old 02-16-2017, 04:43 PM   #10
12vchevydually
 
12vchevydually's Avatar

Name: 12vchevydually
Title: my mind is churnin!
Status: Not Here
Join Date: Jun 2006
Location: Jacksonville,FL
Member`s Gallery
Posts: 840
You need to listen to RYAN TUCKER on this one!!!

I would leave it were you have it and give it a try. We have a lot of axle rotation with
these diesel. If you don't have enough it will go positive under launch and actually unload
the tire.
__________________
<a href=http://www.mybannermaker.com target=_blank><img src=http://i.imgur.com/W2DDm.jpg border=0 alt= /></a>
 
Old 02-16-2017, 05:19 PM   #11
Ryan Tucker
 
Ryan Tucker's Avatar

Name: Ryan Tucker
Title: Do it Dont talk about it.
Status: Not Here
Join Date: Aug 2014
Member`s Gallery
Posts: 255
Check it on the yoke. Start at 5* in the dirt, don't be worried or surprised if you end up at 10, my Black C10 liked 13. Run a non greaseable big joint, and just check it for wear every 100 passes or so, more often if the driveline is off anyway. Making power is Always the easy part. All the slow 60' s have always confused me, use the torque and learn how to put it to the ground. My opinion of course
 
Old 02-16-2017, 06:47 PM   #12
Tate
 
Tate's Avatar

Name: Tate
Title: What?
Status: Not Here
Join Date: Nov 2007
Location: Airdrie, Alberta
Member`s Gallery
Posts: 3,322
I guess he should clarify what his intended use is. I know when I swapped a 2wd rear end into my 4wd without adjusting the pinion angle, anytime you coasted off the throttle was enough pinion change to cause vibrations. Under load it was fine. I only ended up changing the angle by about 3 degrees to get rid of it (about 2 degrees less than engine/tranny angle). I don't think 10-15 degrees out is gonna be much fun on the street.
__________________
'98 3500 2wd, 24v, 5 spd, p-pumped
'98 2500 4wd, 12v, 6 spd, VP'd
'02 VW Jetta, 5 spd.

My p-pump conversion pics
 
Closed Thread

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:54 PM.

 


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2017, CompetitionDiesel.com
all information found on this site is property of www.competitiondiesel.com