Update: I finally got around to addressing some issues, trying to isolate the vibration. Installed new motor mounts, carrier bearing assembly, harmonic balancer, transmission mount. Still got the vibration. Which I only get at 40 mph and under, when stomping on the gas (1st or 2nd), vibration increases with RPMs.

On the highway, she's pretty smooth.

The one thing I haven't done is add shims to the axle perches. I suspect when I had the entire rear axle swapped, that when they welded my perches on the new axle, they were slightly off...and perhaps tipping the output slightly up.

I do have, separate from the vibration, an occasional "shudder", as I start to let out the clutch from a standstill.

Oh well. Making progress. Thanks for all the suggestions.

d

 

FY1

C3AZ6312E .. Harmonic Balancer.

Fits: 1965/67 F100/350 352 / 1960/67 Passenger Cars w/352/390's

Reproduced

Available here: dearbornclassics.com / 800-252-7427 / Online Catalog / Page 152 / Dearborn's part number: HAB10.

 

Shudder when letting the clutch out is commonly caused by oil on the friction disc and flywheel.

The oil causes the clutch disc to "wind up" the drivetrain only a little bit before losing its hold. The cylcle repeats many times per second as the clutch is let out.

Anything in the drivetrain that isn't rigid, like a broken motor mount or weak rear springs will make the problem feel worse because the drivetrain components can "wind up" more before the clutch slips, causing a slower and more violent shudder.

 

haha anything in these trucks weigh right around that much... i was talking with a family member who just bought a brand new dodge truck and said he was having problems with the electric windows... i go yeah... i only have to worry about 10 fueses at the most going out hahahahahahaha he goes why? you truck doesnt have power windows? and i reply NOPE it was made in 63... then later we where driving around town and drive right past a 61-63 2wd or 61-66 4wd and i pointed it out to him, and go thats what my truck looks like.... and he goes OHH those things... does it have the 4speed with granny low,.... mhmm.... he goes stupid POS cast iron trannys hahahaha we had one in our 70 something f-100 and we where trying to put it back in ended up not being able to bench press it in so we ended up wraping a chain threw the opened doors and running a come along down the shifter hole and lifting it back into the truck that way...

i figured since i think youve figured everything out succesfully i would tell a little story from last night..

 

I have a question on this Harmonic balancer issue. How do you tell if the rubber bushing is worn out? is it visible? I figured the balancer would be larger but mine just looks like a large pulley not sure what has been done to this engine before I got it so I'm hoping something isn't missing.

 

If the rubber cracks, the pulley walks away from the inner damper, so there will be a lip formed between the damper and the pulley.

Normally, these two pieces are flush with one another with just a fraction of an inch of the rubber exposed.

Ths harmonic balancer is a one piece assembly, so it was only available as such.

When being assembled, a rubber gasket is placed between the damper and the pulley, then the three pieces are pressed together forming a one piece assembly.

 

I'll check it out. Is the rubber the only thing holding it together?
Thanks again Bill.

 

Yes.

If the balancer begins to come apart, it should be replaced ASAP, otherwise...

Sooner or later...usually sooner, the pulley will completely separate from the damper, and end up in flaying away right into your radiator core with assorted belts and other bits 'n pieces.

I've seen the results of this on dozens of assorted cars/trucks over the years. It's not a pretty sight!

 

That's not good! I'll deffinately check it out tomorrow, I've bee driving it almost every day now. Still getting a vibration under accel and decell but think I've narrowed it down to fowling a plug, gotta get these new heads on soon. I'm finally done with the VW project so the wife is happy and I can get to work on my truck, even got a new tool b ox out of the deal! Thanks.