Chopperdriver
New Member
1970 300 vert, klunk when shifting at low rpm, no sound when shifting at moderate rpm. Transmission mount? U joints seem fine.
Klunk when shifting
- Thread starter Chopperdriver
- Start date
57fury440
Well-Known Member
Rear end gears?
1-2? 2-3? or both shifts?
Was a transmission shift kit installed?
Typically, the only "clunk" should be from "P" or "D" into "R". There is not an accumulator in the "R" apply fluid circuit as there is in the "D" (or forward gears) apply fluid circuit, so it is a "more firm" shift. Which might also take all of the slack out of the driveline items (u-joints and accent any rear axle gear lash, possibly). This item can also be accentuated by quick off-throttle then on-throttle situations at cruising speeds on a smoother/quiet road.
Are there any "new" driveline vibrations in the mix, too? What about the condition of the rear transmission mount rubber???
CBODY67
Are there any "new" driveline vibrations in the mix, too? What about the condition of the rear transmission mount rubber???
CBODY67
Is the throttle linkage to the trans adjusted correctly? (sometimes referred to as "kickdown linkage")
If it adjusted too “strong“ it can klunk on light throttle up shifts.
A shift kit can do the same thing by having the internal pressures too high. It won’t matter when you are on the pedal harder, but will do this and light throttle.
There are times when I've asked this question and gotten the "the linkage is missing" response too.... Which gives you all sort of problems.
Chopperdriver
New Member
Both of them
Chopperdriver
New Member
No I don’t think so, trans was rebuilt about 1,000 miles ago
Chopperdriver
New Member
They seem pretty tight, for 53 years old anyway
Chopperdriver
New Member
No new vibrations that I have felt, I need to climb under there and check the mount.
Chopperdriver
New Member
I’ll look up how to check that, thanks
73 NYB
New Member
My 73 New Yorker developed a similar klunk the last few years I was driving it. I assumed it was the crush sleeve in the 489 case loosening up. I have a couple of other center sections to swap in to see if it fixes it, but never got around to it before I tore it apart to fix the rust on it.
73 NYB
New Member
Not loose enough for stuff to flop around, but loose enough to cause a clunk. Pretty common on 9 1/4's. The 9 1/4 in my '85 W150 you can physically see the yoke get sucked in when you put in reverse, if you stand by the wheel and look in. It bangs like crazy, but goes down the road fine.
73 NYB
New Member
I get the concern, I don't drive it much these days. It'll get its turn at some point. I had another 9 1/4 to go in but it was almost as bad. That one had a sure grip in it though, I plan to go through the rear end when I put it in.
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