620 Loud Clicking

[grant]

My 620 has started a clicking sound from what sounds like the rear of the truck. This clicking only happens when under load and only when going forward. if I feather the throttle starting off/or when sustaining speed/or lift off throttle it doesn't do it, and if I start in second and punch it, it sounds louder.

 

what have I done to the truck recently: I put 3" lowering blocks in it, put a 1" spacer under carrier bearing.

 

Also my wife was making fun of my truck the last time I drove it so I did a wee little brake stand, and after reading this thread

 

http://community.ratsun.net/topic/20939-differential-is-stuck-any-ideas/page__p__294630__hl__%2B620+%2Bdiff__fromsearch__1?do=findComment&comment=294630

 

I thought maybe I blew my rear end, so I pulled it apart, nothing appeared to be damaged so I brought it to my father inlaw (bigger gear head) his diagnosis was that it wasn't the problem.

 

other minor problems with truck; about 1mm play in rear universal (play seemed gone when I greased it, sound continued, so have new one on order), carrier bearing rubber has a small tear in it (on order).

 

So any suggestions? am I missing something in the diff?

 

Next I'm gonna look at the axle/wheel bearings, but I am lost!

[banzai510(hainz)]

u ck the U joints closely!!!!???????

 

 

U didnt by chance remove any leaf springs?

[odmanjohnson]

Did you happen to take the drums off? Hardware in the drum makes all sorts of fun noises when knocked off...

[Wide14u]

i was thinking leaf springs

[metalmonkey47]

Sounds like my U joints when they were going out.

 

 

Pulled my driveshaft to inspect, and found that one of the bearing cups at the input shaft side had completely shattered and fallen apart. It was a wonder the driveshaft stayed on.

[grant]

thanks for the input guys, for got to mention its speed related too (meaning faster I got the faster the clicking gets)

 

- my thoughts would be, leafs springs wouldn't be speed related

- nope never pulled the drums off till now

- looking over the u joints again, seems like no play, nothing broken

 

argh

[lil89ram50]

i'd say u joints.. did you happen to lower it at all in the rear?

[datzenmike]

U joint. Sort of a snap sound. There should be no measurable play in a good U joint. When you get it out you'll find it dry with broken needles.

[grant]

k guys, I get the new u joint tomorrow, will put it in and keep you posted

[ggzilla]

Lots of U-joints have no play, but are shot anyways. You can only tell by removing the bolts and move the joints by hand.

[metalmonkey47]

Mine literally had no play on the input shaft side, but was completely decimated. Wish I took pictures. When I took it to a driveline shop to have the U-joints replaced, they told me it was a wonder that the driveshaft hadn't broken. Then I told em it only had 80HP :rofl:

[grant]

well I replaced one u joint, a few friends stopped by the shop yesterday and said one other has play in it also. I'm ordering up another today so I would imagine I should know by friday if it fixes the problem.

[grant]

decided last minute to change all the u-joints just to make sure, and it worked! I can't believe how much noise the bad one made! and still couldn't tell you which one it was, I ended up having to cut the last two out because I could get them to press out.

 

thanks again for all the help/suggestion the truck is driving like a newly lowered bouncy dream! lol

 

on to suspension now!

[phiz]

I've heard that sound before....on the 500 mile trip back home after picking up my 620!

[izzo]

[grant]

WHOA! none of mine where that bad! lol. . I'm thinking I had a bad/broken bearing or two. I could see most of the caps after I cut them out and didn't notice much (or any) wear