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I am getting vibration starting @ about 2500 rpms in my 61 apache. I swapped out the 235 and put in a 350 crate engine. Am still using original 3 sp tranny and rear end. Am using flywheel from 1961 283 v8. This is what I have done so far. Put on new wheels and had balanced, had a flat spot on drive shaft so took it to machine shop and had tube replaced, has new u joints. Vibration is not coming through steering wheel.

Does it vibrate in neutral not driving..?? Im not sure on the flywheel from the 283. but flywheels and harmonic balancers should be consistent with the engine ur running. if you didnt change the transmission or bellhousing mounts id think the driveline would be ok.. Unless you changed the motor mounts on front and have changed the driveline angularity, which would show up as a driveline vibration. uhhhhhhhh Just because something will fit, meaning bolt up,,,doesnt make it right... hehehe i think thats why they use engineers designin them things rather than us farmer engineers....LOL....

THE BELLHOUSINGS ARE DIFFERENT BETWEEN 6 AND 8 CYL ENGINES IN 61. i ordered a used v8 bellhousing and v8 front motor mount which came out of the same 60 or 61 pickup. So the bellhousing, motor mount, and flywheel came out of the same donor truck. I used factory mounts in factory locations. I used the balancer that the crate motor called for. When I go to parts catalogs or websites such as parts america or summit racing they show the same flywheels for all sbc from 1955-1985 with the only differences being the number of teeth and size of clutch used. Am I missing something? I reused the old transmission and motor mount rubber pads could that be the problem? This is my first engine swap and I have done it by myself. Any help would be welcomed. Thanks

and yes it does vibrate in neutral at the same rpm.

I'm not clear. Does it vibrate in neutral when the truck is standing still.

yes when the truck is standing still. thanks

If you used a Goodwrench crate engine the problem has to be in the damper, flywheel, or clutch. If its a new damper make shure it,s not for a 400 engine. The damper & flywheel on 400 engines have balance wheights built into them. They will fit the 350 & smaller engines but will cause severe vibrations. Other than that it must be your clutch.

Thanks wrenchbender. What type of problem might it be with the clutch? What should I look for?

Thanks wrenchbender. What type of problem might it be with the clutch? What should I look for?

Thanks wrenchbinder. What type of problem might I have with the clutch? What should I look for? Also after I posted this question I ran across another post concerning vibration on a 235 and that brought about another question. I was transferingn the flywheel from one engine to another and did not use an alignment pin could I have shifted the bolt hole positions and thrown off the balance?

Thanks wrenchbender. What type of problems might i look for with the clutch? Also I was transferring the flywheel from one engine to another. If I did not use an alignment pin and did align the hole in thev flywheel with the alignment hole in the crank would that throw the balance off?

Thanks wrenchbender. What type of problems might i look for with my clutch? Also if i installed the flywheel without using and alignment pin and the alignment hole in the flywheel and the alignment hole in the crank were not aligned would that throw off the balance?

Thanks wrenchbender. What type of problems might i look for with my clutch? If when i installed the flywheel i did not get the alignment hole in the flywheel and the alignment hole in the crank properly aligned would that throw off the balance? I know this is probably a stupid question.

its not the rubber pads, its either gotta be the clutch or flywheel your using, and id more than likely say its the flywheel. The balancers for an engine is made for a particular combination of the block itself (crank, rods, pistons) and the flywheel also.. and of the rotating parts are taken into consideration to balance,,and the harmonics of an engine. this also includes the flywheel for an automatic transmission. Such as the most serious difference like wrench said is the 400 combination....another example is the 305 takes a different balancer combination... unlike most popular belief,,, ALL chevy small block parts are not interchangeable...sure they will fit.. but can be a bad combination...
it could also be the clutch disc..?? or the transmission pilot shaft..?? did your have a pilot bushing..???

I,m sorry I thought I replied again. I would pull the flywheel & clutch & take them & get them balanced, like a clutch rebuilder or engine rebuilder. Some of these rebuilt clutches they sell are poorly balanced. The goodwrench engine comes with a pilot bushing in it.

I thought vibration was just part of driving a stovebolt. Mine massages my back.

Nolan