fj40 tailshaft vibrations

[dgfj40]

I have just done a springover conversion on my fj40 now it has major tailshaft vibrations. how can i stop this?

 

[Mike Shull]

I have just done a springover conversion on my fj40 now it has major tailshaft vibrations. how can i stop this?

There are a few things to look at
The angles of the drive shaft both at the transfer case and diff... They should be about the same.
The length of the shaft is important...a short one with sever angles may vibrate...
You might want to try a double cordon joint at the transfer case...I took one off an 92 Toyota pick up and had a custom shaft made...solved my vibration.
A week spring on a SOA can cause a bit of a vibration as well...I'm using Al Can Springs...fixed that...vibration that was under load or spinning in snow..mud..

 

[dgfj40]

thanks heaps now i have some thing to go on. I cant wait 2 go play in my truck

 

[Mike Shull]

thanks heaps now i have some thing to go on. I cant wait 2 go play in my truck

I remember the first day I did my spring over...still had the springs I was using before...factory w/ add a leafs ....shackles that were as long as half the legnth of the springs...and tiny 235/75 R 15 tires....was funny...wish I had pics of it...that was over ten years back!...just had to take it out for a spin befor I made new shackles and put larger tires on her....felt like I was going to tip over....awe the memories!

 

[Mike Shull]

It flexes well now....for what it is..

 

[Degnol]

Have you run over a mattress lately? I've heard it can cause driveline vibrations...

Ed

 

[dgfj40]

no i havent run over any mattresses but f*@!k are they gonna have fun getting that one out

 

[dgfj40]

what other modifications have you made to your truck? after seeing yours im inspired. that flex's really well, and what shocks do you run?

 

[Mike Shull]

I've never run over a mattress before...but hit a road construction sign laying flat on the ground that flinged up side my cruiser and gashed the right side door.....but crap...never like that.....cool!

My Cruiser?...Awe it's just an "Old" build...works great though...
*I pretty much built everything for the shackle reversal, got the tubes for the frame from All Pro for twenty bucks...those guys were cool about it...
*Al Can Springs front and rear, stock hight, 4 inches longer front 2.5 inches longer in the rear, 96-97" wheelbase.
*Rancho RS5000 shocks with home made mounts in the rear, and flipped the front.
*All Pro High Steer kit...from ten years ago...ha!...still works great!
*Stock front drive shaft with proper leghth
*Rear shaft is a conglomeration of pickup and landcruiser...love it!

If everything goes well with the economy I hope to pull it all out next year and put an FJ-80's axels and suspension under her....with 108" wheelbase and longer tub...will be sweet...we'll see.

 

[74fjsemistock]

Mike, that looks good.I too,appreciate the rare factory rust.I'm going for 104" on my other 74.NP204 behind 350.Rockwell under.I only need a couple sponsers to offset the pain of my addiction for which there is no cure.Heep owners should sell their junk and send that change this way.I'll show em how it's supposed to be understood

 

[dgfj40]

top work. Ill get some pics of my truck you will be able 2 see what work i have done
thanks heaps its hard 2 find info like rhis in australia

 

[Blue77FJ40]

Just a thought, were the driveshafts checked to see if they were installed in phase?

 

[Mike Shull]

top work. Ill get some pics of my truck you will be able 2 see what work i have done
thanks heaps its hard 2 find info like rhis in australia

An Auzy eh? Where abouts? My best friend lives in Kensigton...hell of a guy who has 31 splines on his mind at all times!

Thanks for the complements...I tried to have a unique cruiser long a go..."No Rust"...it's hard when you are always camping.... I hope to use Aquaula's 18" strech tub next Winter..will be a great start anyway...now if I can just find someone who can make a custom soft top here in the states...

If you have any questions about the SOA PM me...I have reconfigured the suspension three dozen times...It's a little out dated copaired to what guys are doing now!...but for leaf's I still love it!

 

[Mike Shull]

Mike, that looks good.I too,appreciate the rare factory rust.I'm going for 104" on my other 74.NP204 behind 350.Rockwell under.I only need a couple sponsers to offset the pain of my addiction for which there is no cure.Heep owners should sell their junk and send that change this way.I'll show em how it's supposed to be understood

Thanks! It's an "Old" build...seem out to date on the trail today but still goes anywhere! I'll be back later today...have any pics of your crusier?...It's hard to find one with rust.....he he.

Oh!..and keep after the Heep owners...someday they will understand..I remember 20 years ago when My Cruiser was almost new...bad clutch and the shop told my dad "Welp! I'll give you $500 for her the way she sits...or you pay me $500 for a new clutch...it's just not worth the money...you should just buy a jeep...they last longer" That was back in the CJ-7 days!.....had to laugh again...I was only seven or eight at the time! Little did the shop hand know this was my dad's 4th Cruiser....

 

[dgfj40]

My partner and i live on a farm, 15 miles clear of civilisation, on the york peninsula in South Australia. Near a town called Pt Wakefield. Nice and remote so i have all the room i need and no neighbours to complain.

the last 2 days my partner and i have just completed a 3F to 2F conversion on her 60 series cruiser. Up until 3am thismorning in the "airconditioned" "well ventilated" 2 and a half wall barn. lol, but worth every cut, bruise, and bump along the way.
We have a 500cmf holly to go on the 2F, to see if the ol' girl will go harder.
Also thinking later of doin a spring over conversion in the 60 series, as like the 40 series.

As for the 40 series, i havent as yet completed the tail shaft improvement mods, but thanks to you i am more the wiser.

We'l have some pics for you in the next few days

 

[dgfj40]

Blue 77,

can the tail shafts be put in 180 degrees out ?

 

[Mike Shull]

My partner and i live on a farm, 15 miles clear of civilisation, on the york peninsula in South Australia. Near a town called Pt Wakefield. Nice and remote so i have all the room i need and no neighbours to complain.

the last 2 days my partner and i have just completed a 3F to 2F conversion on her 60 series cruiser. Up until 3am thismorning in the "airconditioned" "well ventilated" 2 and a half wall barn. lol, but worth every cut, bruise, and bump along the way.
We have a 500cmf holly to go on the 2F, to see if the ol' girl will go harder.
Also thinking later of doin a spring over conversion in the 60 series, as like the 40 series.

As for the 40 series, i havent as yet completed the tail shaft improvement mods, but thanks to you i am more the wiser.

We'l have some pics for you in the next few days

Awe..you just described my dream...I grew up around Denver Colorado...large city for this state. Looking for a "smaller" city I took an opening for the company I work for, Wagner Rents, A "CAT Rental Store". The opening brings me to a city south of Denver called Colorado Springs...boy has this town changed...it's nice but not "Small" anymore If things work out here we would like to move just north of town where there are still some large acre prairie...but for here we would be lucky to get a five acre lot...Some day I'll move to the Mountains I figure.

Thanks for writting back...What do you mean about "180 degrees out"?

 

[dgfj40]

what i meant by 180 degrees out, was that when i reinstalled the tailshaft, i may have installed them 180 degrees out? is this true cos ive never heard of this before

 

[fueg0]

my front propshaft was 180* out of phase. It shook like crazy when 4wd was engaged. PO took the truck to a 4wd mechanic, but never did anything about it.

Once I got the propshaft bolts off, it was a snap. At some point, a 1000# gorilla worked on the propshaft, cause I rounded the heads on two of them.

I have the part number for the propshaft bolt kit should you need it.
--jeff

 

[Mike Shull]

what i meant by 180 degrees out, was that when i reinstalled the tailshaft, i may have installed them 180 degrees out? is this true cos ive never heard of this before

Thanks...I guess I have never heard of this either...