65 driveshaft timing

[Timothy N.]

In Noland Adams vol 2 he talks about the 64-65 vibration problem in the driveshaft and eventually there was two paint marks to line up on the rear end yoke to the driveshaft during assembly. The AIM also shows lining up the two paint marks. Does anyone know how to destinguish the correct timing mark? Is it based on the shaft weight in relationship to the pinion shield weight or is it an off center situation between yoke and end of the drive shaft? Hoping to mark it correctly as I restore the chassis. It's a 65 .... Thanks Tim

[Russ S.]

Re: 65 driveshaft timing

The drive shaft is balanced separate of other drive train parts so it shouldn't matter how you put it on. I have never paid any attention as to position it came off and never had any issues.

[Duke W.]

Re: 65 driveshaft timing

I don't see anything in my '63 AIM about matching up paint marks when installing the drive shaft, but it could have been added in later model years. The transmission and axle yokes are machined from forgings and would have very minor static unbalance.

My '63 drive shaft itself does have a tack-welded weight a foot or so ahead of the axle yoke.

Duke

[Don H.]

Re: 65 driveshaft timing

The 64 AIM Sect. 4 Sheet A2.00 Pg. D130 has [Note 1] that says, When assembling Prop shaft to Diff carrier position paint mark on Prop shaft across from paint mark on pinion flange. Revision record shows Assembly Note 1 added on 10-7-63. If I were OP and war painting chassis parts I would assemble drive shaft to pinion flange, and then add paint marks of my choosing and not worry about balance.

[Wayne M.]

Re: 65 driveshaft timing

...... Does anyone know how to distinguish the correct timing mark? Is it based on the shaft weight in relationship to the pinion shield weight ......

This is the first time I've heard mention of the pinion shield weight. Here's one on my early '65 diff (AP_9_17).



c

[Alan D.]

Re: 65 driveshaft timing

And here is some paint left on my 64, same blue & yellow

[Timothy N.]

Re: 65 driveshaft timing

Someone gave me some advice today to put it together and skip this concern but I'll clear up where my info came from so I don't look like I'm hearing voices 🤔. Well maybe..... Page 39 of Noland Adams v2 restoration guide has 3 paragraphs on driveline vibration for some 64s and 65s. As the story goes , the vibration was attempted to be cured by marking the driveshaft "high balance point" matched to the yoke "low balance point". I read this and then came across the same topic in my 1965 AIM book that states to match up the yoke paint mark (blue?) to the driveshaft paint mark. In attempt to assemble my chassis with limited mistakes I was persuing the question to see what others had seen. But earlier today I became conviced to actually figure all this out I would need to run my driveshaft on a balance machine, of which no one in my area balances driveshafts..... It sounds like I uncovered a non issue. Thanks again for the input... Tim

[David B.]

Re: 65 driveshaft timing

This is the first time I've heard mention of the pinion shield weight. Here's one on my early '65 diff (AP_9_17).



c

Original blueprint has the following notation: "Radial runout of pinion flange not to exceed .005 T.I.R. and max. position of unbalance to be marked with paint. Marking to be identified on 3.80 DIA or close to "U" bolt attached." Further notation states: "Select one weight as reg'd to give unbalance less than .18 ounce inch." There are six different weights listed, each with it's own part number. Further notation states: "Attach securely with two arc welds". It appears that all C2's would have this weight but not necessarily the same. I found no mention of driveshaft attachment on this print.

[John D.]

Re: 65 driveshaft timing

FWIW prop shaft drawing 3868727 states: Paint no. 248-0679 yellow or equivalent or optional 248-59863 light green or equivalent marking to be at rear of tube next to nearest exposed trunion and as close as possible to light side at rear of assembly when balanced.

Also assembly must be within 3/16 in. oz. dynamic balance at front end and 0.10 in. oz. at rear when tested at 3500 rpm.

[Jim D.]

Re: 65 driveshaft timing

Page 39 of Noland Adams v2 restoration guide has 3 paragraphs on driveline vibration for some 64s and 65s. As the story goes , the vibration was attempted to be cured by marking the driveshaft "high balance point" matched to the yoke "low balance point". I read this and then came across the same topic in my 1965 AIM book that states to match up the yoke paint mark (blue?) to the driveshaft paint mark.

My 65 clearly has a blue mark on the yolk and a green mark on the driveshaft that were lined up at the time of assembly.