I never would have noticed this if the teeth were not sheered off on my converter but there is a little sticker on the converter disclaiming "lock-up". I know now that I can't use the conventional style converter with this trans. Can I use a lock up type transmission without any other mods in my '64? This is completely new to me and it's safe to say that I need advice...and quick.

Thanks, Pat.

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No, you cannot use a lockup trans in your '64 without extensive custom trans buildup or vehicle modification. The lockup converters come only in large-snout ('68-up), your '64 engine's crankshaft will mate only with small-snout ('67-down) torque converters. Your '64 has twin-cable shift (operated by pushbuttons and a park lever); all the '66-up transmissions (including all the lockup transmissions) use single-rod shift. Your '64 has a flange-type output shaft for a ball-and-trunnion front universal joint; all the '66-up transmissions including all the lockup units have a splined output shaft for a slipyoke and cross-and-roller front U-joint. All '65 and earlier transmissions have the small speedometer drive pinion system, while all '66-up transmissions have the large pinion system. There are some other issues, too, but these are the main ones.

The only transmission that will go right into your car is a '60-'64 slant-6 A904. A '65 unit can be made to work with some valve body modifications. Installing a '66 or later transmission in a '64 car can be accomplished, but it requires addressing each and all of the incompatibilities listed above.

You've been posting a lot transmission and converter questions lately...what-all are you trying to accomplish...?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Sorry, I should have been more clear. I'm not currently running original equipment. I've upgraded to column shift auto already. What am I doing? Good freakin' question. I'm installing a new super six with mated 904. The donor vehicle was an '83 or '86 Diplomat. Now, I could use my old trans with the small diameter converter snout and an adapter or....(enter useful advice here)

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So you are also using the engine that came with the super six setup?

If not and you want to use your early engine= crank change, or a non lockup A904 with an early convertor snout...

-D.Idiot

The column shifter you converted to is from what year vehicle?
The engine you'll be using is from what year?
The driveshaft in your car is stock/modified? From what year/model?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

My current running and driving combo is with a '66 Valiant column shift; pre-'67 225/904; '74 Duster driveshart. Everything new is from the Diplomat. The driveshaft won't change.

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OK, given this info the lockup trans with its lockup converter will swap right in. Sounds like the converter presently on this trans has a chewed-up ring gear, so you'll want to replace it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Alright, that doesn't sound too painful. Can this lock-up type trans be run as-is? Or does it need an external power supply? The other thing is, that I've read in some older post you mention that these transmissions are weaker than the conventional non lock-up style. I do a lot of heavy hauling in my lil' wagon. I wonder if I should just be looking for another '68 and up trans. As far as getting a new ring gear on the converter, will a transmission shop weld a new one on or should I look for another lock-up converter?

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You cannot weld on a lock-up converter without destroying the friction surface inside the converter. If you need a new ring gear you need a new/rebuilt torque converter.

I don't know about the electrical requirements of this particular transmission. Are there any electrical connections on this trans other than the combination neutral safety/backup light switch?

Define "heavy hauling". How much (in mass) do you tow?

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Joshua

Good news, I just found another L/U converter for free.

Joshie, I own a catering company and use the '64 as our main transport vehicle in the Summer. We don't tow with it but it's safe to say that it regularly gets loaded to the tits. Say 200-300 pounds or more.

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OK, that's not heavy hauling. That's just like having a fat friend. Low (numerically) rear axle ratios put more stress on the transmission than higher ratios. If you have 2.93s or numerically higher I wouldn't worry a bit. Your wagon is lighter than the Dippy anyway.

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Joshua

You don't need a power supply, for the lockup is controlled hydromechanically.

As for durability, just run good fluid (Chrysler Mopar ATF+4 is the best — don't use ATF+3).

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks, you guys are champs. The "lock-up" sticker on the converters have the letters "LS" on one and "HS" on the other. Are these significant in any way?

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I wouldn't worry about the sticker too much when sourcing a replacement converter — just specify your application (generically if you're buying an off-the-shelf converter, specifically if you're having one custom-built).

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I was just wondering what they meant, no worrying here (at least not about that) This converter is in like Flyn.

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