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Hey everyone,I'm new here and need help. I have a 1979 f 250. I recently changed it from a 4 speed to a c6. It has a 400 in it. Since I did the swap I have a vibration in it, even when in park. I got the fly wheel from a neighbor. I have read that all 400 engines are all externally balanced. I have read about the separate (hatchet weight) behind the balancer but mine doesn't have that, it looks like it is part of the casting in the balancer itself. My question is could I have a 50 oz flex plate instead of the 28 oz? Does anyone have a measurement on how long the weights are on the 28 vs the 50. Looks like the weight on mine is about three inches long. Now here is the real stupid question, if the above is correct , can I drill some metal out of the weight till the vibration goes away vs pulling the tranny and transfer case out?
First, you don't have a "flywheel" in an automatic. It's called a flexplate. Flywheels are for manual transmissions.
Yes, all 335 series engines are externally balanced....28 oz on the flexplate - 3.0625" on the short (inner curve) side, and 3.375" on the long (outer curve) side. These measurements were taken along a straight line from end of radius to end of radius. I don't know what the 50 oz numbers are.
"The separate (hatchet weight) behind the balancer"....Are you talking about the harmonic balancer on the front of the crank? If so, it will have a 28 oz weight on it also, cast into it.
Here's where it could get sticky. A stick 400 will have a different total weight on the harmonic balancer than a 400 auto will....by about three pounds.....let me check some papers and I'll get back to you. I think you have a too heavy harmonic balancer. In the meantime, peruse the pictures in my gallery..or whatever it's called. You'll find 3 different harmonic balancers and a flexplate....
DON'T DRILL YOUR FLEXPLATE!!!! You have the right one!
...And welcome to FTE. Good people here......."I'll be Bach".......hehe
The trouble with most aftermarket (online) stores is they use the same H Balancer number for both the 351M and 400. Even the Ford part numbers can be the same....but they're different.
Hopefully you have a C6 instead of a C4 trans. There's more vacuum lines needed for an auto, too....are you aware of that? Missing vacuum lines would cause a rough idle, maybe even a shaking situation.
If you want me to post up the pictures, let me know.
I will try to find the ID, it is still on the truck. I will also check the thickness. I am aware of the vacuum to the modulator, it is hooked up. It is definitely a vibration. When you say that the balancer weight is heavier for a standard than an autos balancer, are talking about the imbalance weight being different or the total weight. If the imbalance (28 oz) is the same it shouldn't make it vibrate?
That one is for a stick, ~1.4 lbs heavier....see post #3. You need D2AE-CA. They all have a 28 oz weight...the thickness is different, thus the total weight is different.
Re-check the balancer as Number Dummy suggested. It could have slipped.
Balancer looks fine, I understand about the balancer. My question was about the standards balancer being heavier than the autos balancer. If it is just overall weight that is heavier and the imbalance weight(28oz) is the same do you guys think it would cause a vibration?
Misc: 1977/78 F100/350 351M/400 2WD & 4WD
------------------------------------------------------ D2AZ-6316-C .. Harmonic Balancer - Use with A/T / 6 1/2" O.D. x 3 1/2" long / Marked: D2AE-CA / Obsolete ~ No Ford dealer or obsolete parts vendor has any.
Can't find one of those balancers anywhere for sale. Prior owner said it was a 400. Have a parts truck that has a 400 in it and it's balancer looks just like the one I have and it is an auto truck. Going to find the id for it after flag football practice. Very down about this, I believe this is going to turn in to a **** sandwich
Look at it this way *tilts head*...No, just joshin.'
A manual trans' engine rotating assembly consists of (from front to back) the balancer, crank (a 400 crank is heavier than a 351M, and I'm leaving out the con rods and pistons because the rods are the same and the piston weight difference is negligible), flywheel, clutch and pressure plate.
An auto's rotating assembly has the balancer, crank, flexplate and torque converter. All of which is lighter than the manual's rotating assembly. You probably know this from hefting the various parts in replacing 'em.
Ford engineers decided (I think) that the stick engine needs more overall weight on the balancer than an automatic to keep a smooth running engine because of the weight difference in rotating assemblies. They all have the same 28 oz external weight - on the balancers and flywheel or flexplate. The overall weight of the balancers are different depending on cubic inches, automatic trans or manual trans.
Using the 400's stick balancer's pound and some change (heavier) difference in an automatic set up makes the crank's snout heavier than engineered for an auto trans.
My opinion, yes, it makes a difference.
Bottom to top:
400 stick shift 4wd
400 auto trans 4wd
351M stick shift, 4wd
Can't find one of those balancers anywhere for sale. Prior owner said it was a 400. Have a parts truck that has a 400 in it and it's balancer looks just like the one I have and it is an auto truck. Going to find the id for it after flag football practice. Very down about this, I believe this is going to turn in to a **** sandwich
I called a local auto parts store (Engler Brothers in Santa Monica) that is a very good source for older vehicles. Parts guy said no one reproduces this (D2AZ-6316-C) balancer.
He said to try Damper Doctor. I had forgotten about this company which is located in Redding CA (damperdoctor.com - 530-246-2984).
I'm aware that FTE members have used this source, some liked them, some did not.
Can't find one of those balancers anywhere for sale. Prior owner said it was a 400. Have a parts truck that has a 400 in it and it's balancer looks just like the one I have and it is an auto truck. Going to find the id for it after flag football practice. Very down about this, I believe this is going to turn in to a **** sandwich
Ok, don't get yer panties in a bunch It's not a big a problem as you might think. At least you don't have to yank the trans out
Check the bolts from from the trans to engine for tightness/correct torque again. Check the trans' rear mounting bolts and crossmember. And make sure the torque converter's 4 bolts and good and tight.
Kick back, take a breath, have a smoke and a beverage and relax. You'll get it fixed....patience and clear thought does wonders!
I hear ya, I think I found one on eBay, it looks like the picture in the middle and says it is for a 351c and 400 d2ae-ca. Maybe you can take a look on eBay and see what you think. I typed in ford 400 auto harmonic balancer, it is the 4th one down the list. In McPherson Kansas.
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It's not a big a problem as you might think. At least you don't have to yank the trans out
You'll get it fixed....patience and clear thought does wonders!