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Clunk in driveline when pulling tranny out of Park....?

Greg72

Greg72

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It's a minor complaint, but every time I start the truck and pull it into reverse I get a substantial "BANG" which feels like driveline slop being taken up somewhere.

The rear driveshaft is a nice High-Angle CV-style jobbie that's a few years old (but probably only has 5000 miles on it) there are no vibrations in the driveline at speed. The rear's got a Deeetroit in it, but this problem didn't seem to exist way back when that was swapped in.

Could this be excessive play in the ring & pinion? Do Detroits get "looser" over time, or is this a classic symptom of a driveline that needs a new u-joint (or three?) /forums/images/graemlins/crazy.gif

Idears?
 
Besides the obvious, I've seen vehicles with higher idle speeds (cams, poor tuning, etc.) bang really hard when the motor mounts are shot. Just something to look at.
 
I doubt you have the awesomely popular slip yoke going into the transfer case; but if you do, I've read that pulling the driveshaft and greasing up the splines on the slip yoke will help. I've tried it and it works.

I know I'm smarter than that knowing you wouldn't have something so poser, but maybe there's something in the drivetrain somewhere that just needs a little bit of grease........

/forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif
 
[ QUOTE ]
I doubt you have the awesomely popular slip yoke going into the transfer case; but if you do, I've read that pulling the driveshaft and greasing up the splines on the slip yoke will help. I've tried it and it works.

I know I'm smarter than that knowing you wouldn't have something so poser, but maybe there's something in the drivetrain somewhere that just needs a little bit of grease........

/forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif

[/ QUOTE ]


No slip yoke....just the standard 1972 issue NP205.
 
get under the truck with wheels chocked and parking brake on. someone else in the rig to go from park to drive and then to reverse. if the d-shaft is moving slop in u-joints or ring and pinion. if the driveshaft isnt moving motor mounts or splines from tranny to t-case.

im betting on a u-joint or its time to adjust your ring-pinion.

i also keeping my fingers crossed for you that it isnt tranny to t-case, thats a lot of work for something so small that cna leave you so stranded /forums/images/graemlins/eek.gif
grant
 
Greg, you do have a detroit back there, sometimes mine will do the same if the truck is at an angle. It is normal since the drivetrain becomes loaded when you parked it and the truck settles.
 
mine does the same thing but pinion joint is just fine. But mine is in the T-case
 
[ QUOTE ]
Greg, you do have a detroit back there, sometimes mine will do the same if the truck is at an angle. It is normal since the drivetrain becomes loaded when you parked it and the truck settles.

[/ QUOTE ]


I agree with it being the detroit. My buddies bangs also. There will be more play at the pinion with a detroit, then if there was a standard diff.

Oh and you dont adjust R&P play.
 
Mine started doing the same thing once I put a detroit in it. Probably that, if not I would say Ujoint.
 
My C14FF Detroit has a good 25% rotation from "lock to lock". It can be very noticeable going from forward to reverse, especially if idle is up...
 
Would a Detroit get "looser" over time?

Seems like it's been getting worse over the last 6 months..... the u-joint on the pinion end is a 1410, but I suppose when they go bad it doesn't matter how BIG they are.....
 
Not sure about that, I don't think it should change much, but no facts to base that on...
 
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