My 460 does have a vibration so I was wondering if there is a way to tell if it has a 79 and newer flywheel without taking it apart,its a Jasper reman but who knows what parts the previous owner had installed when it went into the 77 F350 I bought from him.
Flexplate will have a weight welded on the side facing the engine.
Flywheel will have a raised pad cast on the side facing the engine. Triangle shape with the top 1/5th cut off.
View through the starter hole or the inspection plate on an automatic.
I will look tonight and also look for a number on the balancer,the block is a D1 and the heads are D3s but someone could have installed a later crank so I presume I would have to pull the pan to see what crank it has.
I was thinking that Jasper could have installed a 79 and up crank and the PO installed the balancer and the flywheel for the 77 if it does not have a newer balancer and flywheel,I will know after I eat and take a little bicycle ride.
It has the 78 and older flywheel and a balancer with a 70 part number so maybe it was assembled with a 79 and newer crank,I originally thought the vibration was coming from the front suspension but I think its the motor and if it is I am suprised it has not shook itself apart by now.
Jeff,while rebuilders seem to be pretty good about not mixing blocks and cranks I guess it would not be unheard of mistakes do happen.If you have a buddy with a borescope camera you may be able to see the casting number thru the drain plug for that matter harbor freight has them and I don't think their terribly expensive.Also you may be able to rent one,it would be less work than dropping the pan.
Jeff it will be on the flank of 1 of the counterweights but I can't remember which 1 off the top of my head,if you google images it should give you a good idea of what your looking for.
Also is your truck a stick or auto if auto check the torque converter too all are neutral balanced but some have little chunks of metal welded to them to achieve this balance look to see if one may have come off.If it is a stick the correct flywheel for the early engine will probably be an aftermarket one since Ford made no early 460 manual trans. apps.and very few 429 manual trans.apps.If it is an OEM flywheel it is most likely a later external balance unless someone used a 360-390 flywheel to do the swap.If this is the case then you have a some other possibilities for the cause of the vibration,such as pilot bearing engagement.
No difference with vacumn advance disconnected and its a automatic,going to change the oil next week and time to put the scope up the pan to see what crank it is. When I get it going enough that it starts to vibrate I can put in in neutral and left off the gas and it mostly goes away.
One other possibility is if they used a really early crank with the large FE style pilot with the later small pilot converter and it wasn't centered when they tightened the converter nuts.This may be hard to determine though.
The more I think about I think this could be what happened,it has a 71 block and a 70 balancer so it could have the early crank so it might be time to look for a earlier torque converter.
Jeff you might be able to remove the converter nuts,pull the bellhousing bolts and replace the 2 lower ones with longer bolts and remove the trans crossmember bolts and that may allow you to slide everything back far enough to get a look at the converter pilot and the hole in the back of the crank.
Jeff even if it turns out to be early crank with a late converter you may not have to change the converter somebody used to make a register ring to correct the diameter of the pilot,I don't know if they still make them but it would be worth checking.
A bushing sure would be logical. I ran into something like this and never ran across one for what I was doing. I inertained the idea having one turned by a machinist, my project didn't warrant it so if got trash canned. If you can't find one, maybe you know a local machine shop make one up...easy task.
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