C Body Bob
Old Man with a Hat
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Project D440 update
- Thread starter C Body Bob
- Start date
440+ short bed P/U... how long do you suppose the tires will last?
I'm not much on burnouts, but that one sounds like it will smoke them when you look hard at the long, skinny pedal.
I'm not much on burnouts, but that one sounds like it will smoke them when you look hard at the long, skinny pedal.
C Body Bob
Old Man with a Hat
Yea & its nose heavy too with that big 440 up front & slant 6 coil springs. Its gonna be a true hot rod.440+ short bed P/U... how long do you suppose the tires will last?
I'm not much on burnouts, but that one sounds like it will smoke them when you look hard at the long, skinny pedal.
When you say "I can move it around at the front yoke", clarify what you mean. As I'm sure you're aware, the drive shaft needs to be able move in and out as the rear suspension moves. Hence a slip yoke. If it moves laterally (any direction that is not in line with the shaft) then I would tend to think that the tail stock bushing and seal are worn. That can cause clunks but more likely a rumbling sound.
If your splines are engaged and it hasn't fallen out and you're hearing a clunk under load, I would consider that you shaft may be either too LONG and is bottoming out in the tail stock under load, or the splines on the yoke, are as you say, may not be deep enough.
Edit: I agree with the post below from 68plymouth383 that the diff could be part of the issue. Check the tailstock bushing though...
If your drive shaft is too short, the only clunk you'd hear is when it finally falls out...
If your splines are engaged and it hasn't fallen out and you're hearing a clunk under load, I would consider that you shaft may be either too LONG and is bottoming out in the tail stock under load, or the splines on the yoke, are as you say, may not be deep enough.
Edit: I agree with the post below from 68plymouth383 that the diff could be part of the issue. Check the tailstock bushing though...
If your drive shaft is too short, the only clunk you'd hear is when it finally falls out...
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68plymouth383
Senior Member
I'm going to say play in the 3rd member is causing the clunk... How well do you know that diff prior to installing?
C Body Bob
Old Man with a Hat
Everything is brand new
C Body Bob
Old Man with a Hat
The driveshaft is hooked up. I can move it by hand up/down, left right about a quart inch. Seal is new, driveshaft is new, u joint is tight, trans mount is new, engine mounts are new, rear diff is new, clunk is comming from directly below seat. Not at the back. It's not bottoming out as it's 2 inches from the tail shaft. Just easy dry hops in the yard & loud clunk. Hardly a load. Truck moved maybe 2 feet.
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Markus
Member
Did you only replace the rear end?
BeatersRus
Active Member
put the truck up on jackstands under/on the rearend so the full weight compresses
now check your shaft see if you still have wiggle or bindage.
i agree,i dont like any wiggle at all where you say it is wiggling.
another thought,
you have checked the trans mount and the bolts on the crossmember yes?
now check your shaft see if you still have wiggle or bindage.
i agree,i dont like any wiggle at all where you say it is wiggling.
another thought,
you have checked the trans mount and the bolts on the crossmember yes?
There definitely should be no lateral movement there as you described. Something is amiss at the tailstock, be it the shaft or in the tailstock.
C Body Bob
Old Man with a Hat
No
C Body Bob
Old Man with a Hat
Already done all that
C Body Bob
Old Man with a Hat
Drive shaft is too short. Guy cut it wrong.
Might want to take a dial indicator and check the diameter of the yoke shaft. The shop might have installed a small block yoke. I guessing that you probably have an old C Body big block driveshaft around, check the diameter of that yoke shaft for comparison.
Markus
Member
You might be right Bob, using a new slip yoke with longer splines might be the easiest, cheapest, best way to go.
70bigblockdodge
Old Man with a Hat
Buy the longer splined yoke, not a bad idea for a truck suspension anyway with the laden/unladen height changes. All 727 have same output diameters/splines except the 4x4 and ball and trunnion the 904 slip yoke will not even start sliding on the 727 mainshaft.
C Body Bob
Old Man with a Hat
They used my yokes
C Body Bob
Old Man with a Hat
Ok I called my neighbor & he came over. He's an outstanding mechanic. He laid on the ground while I ran through the gears & goosed the gas. He got up & first thing he said was have you changed the trans mount. So I got on the ground while he did the truck & yep the loud clunk is deffinately comming from the trans tail shaft. Steve said the play in the front yoke was ok. Prefer not to have any but that's not whats making the clunk he said. So I need to double check that crossmember & trans mount. Something is wrong there. Hopefully it's just not tight. He said I could bring it to his shop & put it the lift if I wanted to. So if I can't find anything wrong with the mount I guess that's what I will do
65sporty
Old Man with a Hat
You may want to change out that tail shaft bushing, it shouldn't move as much as you said. It's cheap and easy to do.
BeatersRus
Active Member
so,its thursday,what happened w the truck?
get her fixed,what was it?
get her fixed,what was it?
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