TF 727 383 and 440
- Thread starter vsj100
- Start date
Maybe fresh fluid.
Mike
Mike
All 727s are pretty close. If it's a stock 440 no real need to worry. If it needs a rebuild then I can tell you what to improve.
Doug
Doug
vsj100
Well-Known Member
Thanks - I thought that the balance was different for the 440 - torque convertor, harmonic balancer etc. Now I'm learning that there is no difference in balance right? I'm trying to solve a vibration issue. The transmission is the last hope.
You have to tell us more about the 440, mainly the crank and rods that it has. Like #41 said.
hofferwood
Well-Known Member
If the 440 has a "fat" harmonic balancer it means it has a cast crank, and will need a weighted torque convertor. The 383, 99% of the time has a non weighted torque convertor.
That is most likely a vibration problem.
That is most likely a vibration problem.
Only if has 6 pac rods, or if it's a cast crank motor. Both can be identified by looking at the harmonic damper. Cast crank will have the words "cast crank only" on the dampner A 6 pac dampner will have a large section of weight added. It will be easily visible.
Doug
He needs to verify what crank is in the motor. All he said is I have a 440. Could be a Frankenstein of parts like a cast crank motor with a forged balancer.
And, not to be captain obvious here:
But the changes that may be needed for a internally vs externally balanced engine does not affect the transmission itself, but rather the torque converter (or flexplate).
But the changes that may be needed for a internally vs externally balanced engine does not affect the transmission itself, but rather the torque converter (or flexplate).
All transmissions are the same balanced. 0.
The replaceable torque converter, has to match the cranks balance.
vsj100
Well-Known Member
The balancer is "cast crank only" Could this mean a mismatch between the torque convertor/flex plate and the balancer?
Can I verify anything through the trans inspection cover?
Is the torque convertor specific to the 440 or can 383 and 440 use the same TC?
Thanks!
Can I verify anything through the trans inspection cover?
Is the torque convertor specific to the 440 or can 383 and 440 use the same TC?
Thanks!
hofferwood
Well-Known Member
440 cast crank torque convertor needs one of these----------the weight. And yes you can see thru the inspection cover.
So you most likely have a cast crank motor. However it still could be a forged crank motor with the wrong cast crank balancer. Not knowing what crank is in the motor is a gamble. You can roll the dice with the cast external balance converter and keep your fingers crossed.
vsj100
Well-Known Member
Here's is my report.
1. The 2 trans nuts were loose and tightening them made the vibration worse
2. There is no weight on my TC so those who put this machine together didn't know better
3. While it is very fast I do not intend to race it. Please offer suggestions on the new TC and trans rebuild tips
Thanks!
1. The 2 trans nuts were loose and tightening them made the vibration worse
2. There is no weight on my TC so those who put this machine together didn't know better
3. While it is very fast I do not intend to race it. Please offer suggestions on the new TC and trans rebuild tips
Thanks!
If you plan on changing the TC anyways..
I'd tack on the proper weight and try it..
I'd tack on the proper weight and try it..
vsj100
Well-Known Member
Thank you! I believe this is my problem. The TC has no weight. It is a cast crank motor.
vsj100
Well-Known Member
I'll do that. Does the weight orient with something on the balancer? My TC has a drain plug.
This is from a 76 400 truck, I believe the 400/ 440 are the same
Similar threads
