Driveline angles

odtseuss · 10-15-07, 08:51 PM

What drive line angles are you guys running and how are they working for you? I know this varies a lot from truck to truck but I am curious to see what you guys are getting away with. Most of the articles I have read recommend very low angles and I know people are getting away with a lot more so please do tell.

I am building a spring over 40 with a stretched wheelbase and I would like to get it as close to flat belly as possible but I don't know if I'm going to be able to get away with the driveshaft angles or not

fj40forlife · 10-16-07, 12:40 AM

pretty hard to tell. we dont know if your engine is sit back (V8) if axle are cut and turn etc wheelbase and everything. i think it would be okay if your front axle is mored forward or cut and turn

odtseuss · 10-16-07, 01:15 PM

At this point I'm looking at around 20-25 degrees front and rear. both shafts are between 30-40 inches long. I am planning on using a cv driveshaft to achieve that angle, and I'm planning on a cut and turn. I know that some manufacturers make cv driveshafts that exceed these angles, though I don't know anyone running them or how much vibration there getting. This isnt a daily driver though I would like to be able to drive it to and from the trails. I think it would be worth the flat belly if I could get drivelines that behave at these angles. So what I'd like to know is if anyone has experience running shafts at these angles and beyond without significant vibrations and maybe even what shaft setup they are using.

Tapage · 10-16-07, 03:42 PM

with 20º range you will be fine using Double CV drive shaft .. actually that can go over 25º ( Toyota Hi Lux ones .. coz TLC ones are designed for work at less degrees )

I thought some special hi angle Drive Shaft are not rated for on road driving .. maybe it's related to the own construction.

BongAcura · 10-16-07, 03:55 PM

Always the most important thing to remember is that your u-joint are "in phase" and also that the angle out of the t-case and the angle into the differential are not more the 2 degrees different.

fc187 · 10-16-07, 09:28 PM

Quote:

Originally Posted by BongAcura

Always the most important thing to remember is that your u-joint are "in phase" and also that the angle out of the t-case and the angle into the differential are not more the 2 degrees different.

phase yes!

t-case/diff angle +/- a degree? ,..... yes. on a "standard" u joint

but not neccesary on a CV . keep the pinion end on a CV drive line, a degree or so under inline

fc187 · 10-16-07, 09:41 PM

Quote:

Originally Posted by Tapage

I thought some special hi angle Drive Shaft are not rated for on road driving .. maybe it's related to the own construction.

they are BIG and heavy and have lubrication issues when ran at high speeds for long periods.

but they have their place

fc187 · 10-16-07, 09:44 PM

Quote:

Originally Posted by odtseuss

What drive line angles are you guys running and how are they working for you? I know this varies a lot from truck to truck but I am curious to see what you guys are getting away with. Most of the articles I have read recommend very low angles and I know people are getting away with a lot more so please do tell.

I am building a spring over 40 with a stretched wheelbase and I would like to get it as close to flat belly as possible but I don't know if I'm going to be able to get away with the driveshaft angles or not

you dont have a shackle rev. do you?

SR + steep stock DL's =

odtseuss · 10-17-07, 12:37 PM

It does have a shackle reversal. The front shaft would be about 39 inches long and sits at about 17 degrees resting and a little over 20 degrees at full drop. The length should be plenty of room for a cv and a long travel drive shaft. Also the front shaft would not see as much use at high speeds. Though I don't know if this angle will be very problematic. I have not decided which shafts to use, though I am quite certain that stock shafts will not be sufficient.

I was more concerned about the rear since the shaft is shorter (31) and the angle steeper (20-25) and it will see much more use at high speeds.
I would guess that some rigs are running greater angles than these though I'm not sure which shafts theyre using and how well its working.

Tapage · 10-17-07, 03:01 PM

if you can keep your rear angle under or at least close to 20º - 22º with a Toyota CV you will be fine .. obiusly a track bar it's must.

Eskimo · 10-17-07, 05:09 PM

With a clearanced minitruck CV, you can run about 25° static, 32° MAX, but the life of the joint suffers.

I ran one in the back when I had the cruiser axles.

odtseuss · 10-17-07, 06:10 PM

Wow, thats good to know. I've got a few of those lying around. I would expect the life of any joint to suffer more at significant angles. Do they run pretty smooth assuming they are phased and balanced properly?

hammerhead · 10-17-07, 10:35 PM

I run mini-truck CV style front shaft on the rear of my 40 retubed with sch 40 pipe and joints clearanced to achieve about the same angles Eskimo has listed above. I can get a couple years out of a u-joint at those angles as long as I don't fall on them hard enough to break 'em...

Tapage · 10-18-07, 11:29 AM

Quote:

Originally Posted by odtseuss

Wow, thats good to know. I've got a few of those lying around. I would expect the life of any joint to suffer more at significant angles. Do they run pretty smooth assuming they are phased and balanced properly?

sure .. good grease and care ..

10-15-07, 08:51 PM	#1
odtseuss IH8MUD Rookie Join Date: Apr 2006 Location: SLC,Utah TLCA# 12676 Posts: 47	Driveline angles What drive line angles are you guys running and how are they working for you? I know this varies a lot from truck to truck but I am curious to see what you guys are getting away with. Most of the articles I have read recommend very low angles and I know people are getting away with a lot more so please do tell. I am building a spring over 40 with a stretched wheelbase and I would like to get it as close to flat belly as possible but I don't know if I'm going to be able to get away with the driveshaft angles or not

10-16-07, 12:40 AM	#2
fj40forlife IH8MUD Lifer Join Date: Dec 2005 TLCA# 5624562435 Posts: 1,057	pretty hard to tell. we dont know if your engine is sit back (V8) if axle are cut and turn etc wheelbase and everything. i think it would be okay if your front axle is mored forward or cut and turn __________________ What is rock crawling? My build http://www.pirate4x4.com/forum/showthread.php?t=637144

10-17-07, 05:09 PM	#11
Eskimo Rev limiter abuser Join Date: Sep 2002 Location: Danville, PA Posts: 1,150	With a clearanced minitruck CV, you can run about 25° static, 32° MAX, but the life of the joint suffers. I ran one in the back when I had the cruiser axles. __________________ Rich in NC FJ - '73 FJ-40 Cruggy - LSx/4-wheel steer Rockwells/4-link/coilovers/42's Build thread --> http://forum.ih8mud.com/hardcore-corner/124040-keeping-low-rockwells-k-under-knife-again.html '01 Chevy 2500HD 8.1 Allison Lux-o-tow

10-17-07, 10:35 PM	#13
hammerhead IH8MUD Lifer Join Date: Jul 2003 Location: Central, Utah Posts: 2,171	I run mini-truck CV style front shaft on the rear of my 40 retubed with sch 40 pipe and joints clearanced to achieve about the same angles Eskimo has listed above. I can get a couple years out of a u-joint at those angles as long as I don't fall on them hard enough to break 'em... __________________ utah4x4club.com U4WDA

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10-16-07, 01:15 PM	#3
odtseuss IH8MUD Rookie Join Date: Apr 2006 Location: SLC,Utah TLCA# 12676 Posts: 47	At this point I'm looking at around 20-25 degrees front and rear. both shafts are between 30-40 inches long. I am planning on using a cv driveshaft to achieve that angle, and I'm planning on a cut and turn. I know that some manufacturers make cv driveshafts that exceed these angles, though I don't know anyone running them or how much vibration there getting. This isnt a daily driver though I would like to be able to drive it to and from the trails. I think it would be worth the flat belly if I could get drivelines that behave at these angles. So what I'd like to know is if anyone has experience running shafts at these angles and beyond without significant vibrations and maybe even what shaft setup they are using.

10-16-07, 03:55 PM	#5
BongAcura IH8MUD Rookie Join Date: Apr 2007 Posts: 19	Always the most important thing to remember is that your u-joint are "in phase" and also that the angle out of the t-case and the angle into the differential are not more the 2 degrees different.

10-17-07, 12:37 PM	#9
odtseuss IH8MUD Rookie Join Date: Apr 2006 Location: SLC,Utah TLCA# 12676 Posts: 47	It does have a shackle reversal. The front shaft would be about 39 inches long and sits at about 17 degrees resting and a little over 20 degrees at full drop. The length should be plenty of room for a cv and a long travel drive shaft. Also the front shaft would not see as much use at high speeds. Though I don't know if this angle will be very problematic. I have not decided which shafts to use, though I am quite certain that stock shafts will not be sufficient. I was more concerned about the rear since the shaft is shorter (31) and the angle steeper (20-25) and it will see much more use at high speeds. I would guess that some rigs are running greater angles than these though I'm not sure which shafts theyre using and how well its working.

10-17-07, 06:10 PM	#12
odtseuss IH8MUD Rookie Join Date: Apr 2006 Location: SLC,Utah TLCA# 12676 Posts: 47	Wow, thats good to know. I've got a few of those lying around. I would expect the life of any joint to suffer more at significant angles. Do they run pretty smooth assuming they are phased and balanced properly?