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Thread: Rear end problems??
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08-01-2010 #1
Rear end problems??
Took the car out for a spin today and a new issue, oh joy. When shifting the 700R4 from 3 to 2 or 2 to 1 when not under load and low speed down shifting I get a big clunk in the rear end. One time when shifting when not under load, just coasting and going 3rd to 2nd and back to 3rd a few times listening for the clunk it seemed like the rear gears would not mesh, I got a bucking clunk clunk then it went away and engaged. Also when turning ( mostly left) it feels like I am driving over a rough surface, like gravel. Trans was serviced 2 weeks ago. 100%. U joints front and back replaced 2 months ago. Rear is full of fluid. Would adding more gear additive resolve, or drain all fluid and put in new? Current fluid is a year old. Broken spider gears or worn positraction clutches? I have no experience in rear/diff work. Any advice on assessing this?
Thanks
70 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
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08-02-2010 #2What rear end do you have and what differential is in it? Do you have leaf springs? What type of traction devices do you have?
'69 RS/SS396 pro street/427/4spd/9"
http://rides.webshots.com/album/576443881hfGXxd
http://good-times.webshots.com/album/568860081GZRpyZ
08-02-2010 #38.5
eaton posi
leaf springs
slide a links70 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
08-03-2010 #4Kinda sounds like an issue I had with my rear. I didn't get the pinion preload correct when I put my rear together, and would get a very loud clunk when I would accelerate or decelerate. I didn't have a gravel road feel when turning though.
Some times I'm fast sometimes I'm half-fast
08-03-2010 #5Hmm, I wonder if my rear shifted and threw out the pinion angle. I was out last week and the car hooked real hard on nice new black asphalt, I thought I felt a big clunk in the back as it hooked. I have checked leaf spring mounts front and back, tranny mount/crossmember and engine mounts. All are A OK.
70 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
08-03-2010 #6I was able to put the car in park and roll the back wheel back and forth enough to get it to clunk. Thats how I knew the sound was coming from the rear and not something else. I could feel nothing at the pinion with the drive shaft off. I couldn't move it in or out and it felt fine spining it around. May not be your issue but its easy to check.
Some times I'm fast sometimes I'm half-fast
08-03-2010 #7thanks rohrt, will try that.
70 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
08-03-2010 #8Did you use the limited slip oil additive. and was it the GM or Ford additive? One bottle of GM additive should be enough to take care of that noise when turning. The other problems might be in the transmission or the suspension.
'69 RS/SS396 pro street/427/4spd/9"
http://rides.webshots.com/album/576443881hfGXxd
http://good-times.webshots.com/album/568860081GZRpyZ
08-03-2010 #970 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
08-10-2010 #10video of clunking
ok, have removed driveshaft, replaced u joints, tightened every conceivable mount, bolt, bracket, etc. Motor mounts are good, tranny mount and cross member good. Slide a links tight, frame connectors tight, , shocks tight, all u bolts tight. leaf springs good and tight.
Still has the clunk, so I thik it is in the rear. Here are 2 vids.
http://www.youtube.com/watch?v=Dr1nL...layer_embedded
http://www.youtube.com/watch?v=98BoE...layer_embedded
Edit, video's were sent to a rear end guy, he says looks like the pinion nut that holds the pinion in is loose.
That is why is good under load, but clunks when coasting or no load.70 Nova - 406 sb -488 HP/504 TQ-3:73's
http://s66.photobucket.com/albums/h266/steelratnova/
08-10-2010 #11