727 converter questions

[miller]

Converters have always been a point of ignorance for me. So, I'm looking for any thoughts.

I'm working with a 69 440 magnum, and 67 727. I'm trying a little research, to find any differences on the converters. Just considering the input shaft in the 67 model 727, will I be better off looking at a converter for the 67?

Are the 67-69 model stock converters, for the hi-po set-up, all the same? Same stall?

Thanks for any help.

 

[miller]

Lol. Head on straight.

Need to add...

440 steel crank (of course on a Mag motor), and mainly a street driver, though I'm wanting a strong set.

Just looking at the 'fit' details, what stall I should be wanting for the match-up I have.

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Should I be looking at stall, or the application?

 

[emore]

67-69 440 should have had 11-3/4" diameter conv., pretty low stall speed, good for a cruiser with a stock type cam.The splines were the same, mark your flex-plate before hand, it can only go in one way, Bill

 

[miller]

Thanks, Bill!

Doesn't have anything on my rear gears does it. 3.55.
I'll hit the books, before I do anything.

 

[Propwash]

Here's a good article for you:


http://www.hardtail.com/techtips/selectingconverter.html

 

[Garys1969RR]

I always like using what used to be called the Street Hemi converter. It has a slightly smaller diameter, like 11", and a little higher stall speed. There is about a full inch from the ring gear teeth to where the converter housing starts. One like this came on my 1977 440/727 assembly. This one has external balancing to go with the factory cast iron crankshaft. If you have a steel crank, you can remove the weights from the converter, to be compatible with a steel crank. I have 3 of these 11" converters, with and with out balance weights. Would be willing to sell one of them if you are interested.

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And these T/C have the same splines as your 1969 440 Magnum/with 727 transmission would have.

 

[dvw]

How much do you want to spend. PTC will sell you what you need for around$450. Your local trans supply can supply you with the factory 10 3/4" High stall. Beware there are 10 3/4" factory low stall as well. The high stall was behind 383/335 hp, 340, Hemi.
Doug

 

[miller]

Great info, and article on converters. Thank you, guys!
Maybe an old dog can learn new tricks. I have to admit all my experiance is with 383 hookups with the 727, and this is my first 440. I've already gone through the 727, which by the numbers came out of a 67 Coronet RT.
Guess I got thrown a little on the 440 flexplate bit, between a cast, or steel crank. Mine is steel.

I'm only thinking about bumping the cam a notch, and wasn't sure if the normal 'application' converter would be what I should look at.

This 440 will be my last build, just working up the plans, and not wanting any unseen probs with the set-up.

 

[Garys1969RR]

Also remember that there are e few different flex plates. A larger diameter one, and one a little smaller that fits the 10 3/4 converter. Also there are 2 bolt sizes for flex plate to converter. The larger diam flex plate has the smaller bolts. The smaller diam one can have either size bolt. I have several of them all sizes and bolt sizes. I prefer the larger bolts because they are stronger and easier to work with.

 

[miller]

Right on the flexplates. Glad you mentioned that. Off hand, I don't remember if the stock plate was with the motor. I'll have to look.

Also need to get back into my 727 handbook. Kinda recall seeing something about the centering dowel on the converters, that go into the rear of the crank. Wasn't sure on the 2 years I'm working with, or if there are two sizes on that dowel.

Waiting until it warms up a little, 'til I get into the shop.

 

[ZombiePopper]

Here ya go

 

[miller]

Oh, yeah! Thanks, ZombiePopper! Learning real quick that there's a wealth of info, and knowledge here, and great folks to deal with. Old dog can learn.

Garys1969RR - I'll PM.

From what I'm looking at, one of those hemi converters would probably do what I need. Not looking at going too overboard on things that much, since I want some good mileage, too.

Sure do appreciate all the great help!

Need to add, I'll be out of touch for a couple of weeks. Driving to Seattle to see #10 grandchild. I will get back to it.

 

[Propwash]

Need to add, I'll be out of touch for a couple of weeks. Driving to Seattle to see #10 grandchild. I will get back to it.

Congrat's. Have a Safe & Happy trip.

 

[440fish]

Good thread. I also am struggling with torque converter selection. Unfortunately I have no idea what cam is in my 440 so its impossible to spec properly. Talking to Coan they also like the hemi converter for street use. I have a basic 440 build (carb, performer rpm, headers, and a cam) and think this is the way i will go. Long term i plan on pulling the motor and freshening it but funds aren't there yet and i want to enjoy it for a season.

Right now i have zero launch and the car is creeping at idle with what i assume is a stock converter (have to stand on the brakes at a light). Once she gets up to 3k its off to the races but not what i desire as far as performance. 323 gears dont help either but im swapping for 3:55s soon