slack in my drivetrain somewhere..... - Page 3

Leadsled124 · 08-29-2007, 02:18 PM

can you post a pick or link of those latteral bars plz? Would these do somthing similar to help? i have bad axel wrap. http://www.jcwhitney.com/autoparts/P...009351/c-10614

i know ts more of a slappper bar, but i want somthing that will help at the track and on the street so my rearend wont explode. also im not sure if 30" is correct either

TallTexan · 08-31-2007, 07:46 PM

I bought 4 u-bolts from Autozone and bolted the springs down 3 inches from the end of the bottom bar on the spring, back and front of the axle. 90 percent of the clunking went away. Only thing i see now is the driveshaft sliding back and forth on the spline comming from the tranny. No way to lube that connection without removing the shaft.

XRING600 · 10-05-2007, 03:47 PM

The transmission was replaced a couple of weeks ago but did nothing to remedy the drive line slack. After engineers getting involved again they have determined that the transmission module and the valve body are to blame. According to Nissan these pieces of equipment are not working properly. New part numbers have been issued for trucks that are experiencing the symptoms described at the 1st of this post.

I should have the transmission installed next week with new parts inside. They decided not to open it up and just replace the parts after I expressed concern about cracking my tranny open.

The dealer has been great as well as Nissan in trying to fix the problem. I am keeping my fingers crossed.

XRING600 · 10-22-2007, 03:33 PM

Ok. Tranny replaced and the problem is better I must admit. The noise is still there when I put the truck in drive or reverse but it helped when pushing the gas down. The truck shifts much better and runs smoother. No big thump when taking the truck off of cruise control.

The tranny problem was isolated when diagnostics was run on my truck. They found the tranny control module was not talking to my truck and the transmission was in mechanical mode. The new tranny has a different TCM and valve body. According to Nissan this tranny is the 2008 model and will be used to replace any other trannys in Titans experiencing this problem.

The new part number for the tranny is 31020 ZH80C.

StuntDriver06 · 12-08-2007, 02:14 PM

subscribing....

here are my thoughts... axle wrap will happen in ANY leaf spring vehicle... it has to, springs are designed to give... but when that happens, the slip yoke is forced to slip (go figure lol) while it is under a load. if the slip yoke is not lubed properly or is out of tolerance, wouldnt this cause the symptoms above?

i agree our rear ends move WAY WAY too much.... i believe nissan gave us softer primary weight bearing springs for a better ride, then made an extra thick overload spring for payload, so basically they got rid of one evil and made another way worse (axle wrap).

i noticed when i put my 400 lb 4-wheeler in the bed, it jsut flattens the springs, that is up to the point of the overload, then it doesnt squat any more, even with my dads fully loaded 20 ft trailer it only squats maybe a couple more inches....

also when it is loaded, no more clunk... i actually made a video today of the rear axle twisting... i am working on posting it... very, scary to see all the motion it is making...

StuntDriver06 · 12-08-2007, 03:25 PM

just installed helper springs from advance auto.... no more clunk... this will do until i can get traction bars... i am going to make an after video tomorrow or next week.... i noticed the difference before i even got out of my driveway...

sudden urge · 12-08-2007, 04:06 PM

Quote:

Originally Posted by StuntDriver06

subscribing....

here are my thoughts... axle wrap will happen in ANY leaf spring vehicle... it has to, springs are designed to give... but when that happens, the slip yoke is forced to slip (go figure lol) while it is under a load. if the slip yoke is not lubed properly or is out of tolerance, wouldnt this cause the symptoms above?

i agree our rear ends move WAY WAY too much.... i believe nissan gave us softer primary weight bearing springs for a better ride, then made an extra thick overload spring for payload, so basically they got rid of one evil and made another way worse (axle wrap).

i noticed when i put my 400 lb 4-wheeler in the bed, it jsut flattens the springs, that is up to the point of the overload, then it doesnt squat any more, even with my dads fully loaded 20 ft trailer it only squats maybe a couple more inches....

also when it is loaded, no more clunk... i actually made a video today of the rear axle twisting... i am working on posting it... very, scary to see all the motion it is making...

Everything you just posted is correct. A year and a half ago, I had to do something about that annoying bump bump feeling. I did some research and my final solution was the Hellwig traction springs, it was either that or I had a spring shop lined up to add another long leaf to the stock spring pack. Traction bars are the best solution, but they are pricey. In the end, you want to minimize rear axle movement as much as possible which also helps reduce wear and tear on all the driveline components.

PRJ · 12-10-2007, 08:06 AM

Quote:

Originally Posted by sudden urge

You're perfectly describing the symptoms of axle wrap. There are 3 solutions to reduce or eliminate it. The least expensive is the reverse mounted helper springs for $25, then the Hellwig traction springs at $80, and finally traction bars at $250ish.

Where do you get the reverse mounted helper spring or the Hellwig traction springs?

sudden urge · 12-10-2007, 08:56 AM

Quote:

Originally Posted by PRJ

Where do you get the reverse mounted helper spring or the Hellwig traction springs?

http://www.jcwhitney.com/autoparts/P...action+springs

StuntDriver06 · 12-10-2007, 02:07 PM

here is the drivetrain video, taken from the top of the differential.. this is before the spring helpers.... notice the amount of twist during braking and acceleration...

http://videos.streetfire.net/video/7...ff01220e18.htm

im going to make the after video in a few mins...

sudden urge · 12-10-2007, 04:31 PM

Quote:

Originally Posted by StuntDriver06

here is the drivetrain video, taken from the top of the differential.. this is before the spring helpers.... notice the amount of twist during braking and acceleration...

http://videos.streetfire.net/video/7...ff01220e18.htm

im going to make the after video in a few mins...

Great video!! There has to be at least 3" of movement in that video. Too bad you couldn't get a video showing the passenger side rear leaf twisting and flexing. Thanks for the video.

StuntDriver06 · 12-10-2007, 04:58 PM

http://videos.streetfire.net/video/5...000126b0d0.htm

and heres the after video....

still some movement... and i do believe there is more than 3 inches of movement in the diff in the first vid.... hard to tell though...the camera was mounted to the diff keep that in mind...

how much different do you think it is in the second vid?

sudden urge · 12-10-2007, 05:35 PM

To me it looks like less movement, maybe 20-30%. Almost need to watch the videos side by side. Up and down movement is due to weight transfer, and it would be much better to get a shot of the rear axle and one leafspring. To actually see the rear axle move forward and backwards along with the leaf twisting. Your exhaust sounds good!

StuntDriver06 · 12-11-2007, 02:02 AM

if you look roughly halfway through both vids, there is a spot where there is 2 big bumps and you can see the up and down movement easily, it seems to me that it is much different than the twisting motion of the axle... ill try to get another video with the camera fixed to the truck somewhere, hard to mount it anywhere

thanks for the kind words on the exhaust...

AgTitan06 · 12-11-2007, 02:33 AM

Great videos, Stunt.

Please take one of the rear axle and leaf springs under acceleration and braking without the helper springs.

What kind of video camera did you use to do this, and how did you mount it?