Torque converter balance question

[GRA 426]

I recently purchased a new TCI transmission and torque converter (727 streetfighter) - when removing original torque converter, i noticed that the old torque converter had a butterfly weight on it and it appears that the new torque converter does not have any external weights attached.

Any help would be appreciated...

GRA426 (USMC 83)

 

[shag766]

i would be confident that tci balanced it. very reputable company

 

[racedodge]

i would be confident that tci balanced it. very reputable company

except for when their transmissions fail on break in and then do not warranty their product... just saying.

~~~~~~~~

Check their website to ensure that your part number does indeed correspond with an externally balanced engine.

The weight on the balancer is not for the converter, but to offset the unbalanced engine to ensure no extraordinary vibrations are transmitted to the transmission from the engine itself.

 

[Meep-Meep]

It sounds to me that you have an externally balanced cast crank engine and the TCI converter is for an internally balanced steel crank engine. External balancing is noted by only having one weight at approximately a 7" radius from the center. You can either exchange the converter for the correct type to go with your engine (recommended) or weld a weight onto the TCI converter. Direct Connection used to sell a weight package to convert zero balance converters to externally balanced types. Did your engine run smooth throughout the RPM range? You should verify what you have before proceeding with mods or exchanges. Look at your harmonic balancer to see if there is an offset weight on it. If so, chances are it's externally balanced and will need the weight.

 

[GRA 426]

Thank you for the help...

 

[Supershafts]

i would be confident that tci balanced it. very reputable company

Hey GRA426. . . . . ..


Send it BACK NOW! ! !!


You've been warned

Or when 1 just quits, the 2nd flys apart, the 3rd removes itself from the car practically, but in small easy to sweep up pieces...

Wonderful pos they make..... This was more years ago then you want to know, and i'll bet you find many newer people with similar stories. . . . .

 

[GRA 426]

who would you reccomend other than TCI?

 

[SUPERSTOCKRACER]

Hey GRA426. . . . . ..


Send it BACK NOW! ! !!


You've been warned

Or when 1 just quits, the 2nd flys apart, the 3rd removes itself from the car practically, but in small easy to sweep up pieces...

Wonderful pos they make..... This was more years ago then you want to know, and i'll bet you find many newer people with similar stories. . . . .

BEST ADVICE I'VE SEEN TODAY!
call ATI or turbo action or A1 i went with a neal chance but have been running turbo actions for years.
frank lupo dynamic converters in very good also.

 

[racedodge]

who would you reccomend other than TCI?

A&A
Copes Racing

are who I would recommend. I would say "me" but I do not build transmissions anymore for order, just on whim.

 

[68gtx]

It sounds to me that you have an externally balanced cast crank engine and the TCI converter is for an internally balanced steel crank engine. External balancing is noted by only having one weight at approximately a 7" radius from the center. You can either exchange the converter for the correct type to go with your engine (recommended) or weld a weight onto the TCI converter. Direct Connection used to sell a weight package to convert zero balance converters to externally balanced types. Did your engine run smooth throughout the RPM range? You should verify what you have before proceeding with mods or exchanges. Look at your harmonic balancer to see if there is an offset weight on it. If so, chances are it's externally balanced and will need the weight.

how do you tell if your crank is a steel crank or a cast crank? internally or externally balanced?

 

[racedodge]

how do you tell if your crank is a steel crank or a cast crank? internally or externally balanced?

cast crank:

forged crank:

~~~~~~~~~~~~

all internally balanced engines had the thin harmonic balancer.. but... generally speaking, all 383's had a forged crank, all 400's were cast crank, all 340's up to 73 model year were forged, then in 73 some were cast cranks, 318's are all internally balanced engines, 360's were all cast externally balanced engines, 440's up to 71 were all forged crank motors, then in 72 they went to internally and externally balanced (i.e. forged internal, cast external). Some 440's in trucks up to 78 model year had forged cranks in them, but a VERY small percentage... some early 70's 440's in trucks had forged cranks, but only if they were mated to a 4 speed transmission, and that is a rare occurrence. 273's were all internally balanced.. hemi's are all internally balanced.

hope that helps but I do not know about /6's.

needless to say.. if it has a cast crankshaft its externally balanced and if it has a forged crankshaft it is internally balanced.

 

[Elvad]

Converter..

Cast crank motors need the weight on the converter. Steel crank motors do not use a weight on the converter. You can use a neutral balance converter (no weight) with a cast crank motor if you get the correct flexplate from B&M racing. A lot of converters now have no weight, Chrysler sells the weight and a template so you can weld it on yourself. (if you need one) I don't personally want to weld a weight on a converter. checkout www.bmracing.com for more info. If a converter with a weight is installed on a motor with a steel crank it will shake noticeably at idle and vibrate pretty good thru low RPM. I have seen this many times. At first you think you are chasing a skip.

 

[racedodge]

...At first you think you are chasing a skip.

and then you find out you wiped your main and rod bearings :icon_hang: