I have a cheapskate trans question that's prolly been asked here before

Can I take the innards from a known good late model 999 trans (late 80s 5th ave) and stick 'em in a '73 or '74 904 /6 case if I use everything (converter, pump, valve body, etc.)? Or did anything about the case itself change between the lock-up and non-lock-up trannys that would keep this from working?

Thanks!

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Brian (Valianator)

'65 Valiant V100 170/T-flite
'82 D150 225/4-speed
'65 Dart 225 4 door
'68 Dart 225 4-door with Valiant front clip (future project)

I believe the lock-up case has a fluid passage in it for the converter.

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Official Cookie and Mater Tormentor.

There's a bunch of "tuff luck, won't fit" stuff that gets in the way of doing this swap. The A999 has a double-wrap band for which there's no space in the early case. The '80-up transmissions have the cheesier/noisier wide-ratio planetaries, for which different governor inner and outer members and different valve body calibrations are needed. There's the lockup/non-lockup difference.

Short answer probably has to be "no" on this one.

I put the "cheesier" wide ratio planetaries in the 904 that's in my Duster, stock 1970 governor weights and valve body (with some mild shift improvement mods), no problem.

D/W

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If it ain't broke, fix it!

When I say "cheesier", I refer to the planetary assembly's construction. The earlier unit is a really nice machined-aluminum assembly; the later unit is indifferently welded stamped steel. Also the wide-ratio gears are a lot noisier. Interesting that you were able to get acceptable shift points (both up and down, I assume?) with the mismatched governor!

I've found in my experience that changing governor weights really doesn't make all that much difference. Obviously it has to make some, but those changes seem to be outweighed by other valvebody changes and the throttle pressure setting. The 440/727 combo in my '65 Belvedere has the "baby 904" lite weights installed. The difference is only noticeable at WOT, and even then, it's not all that much. The Duster does have a lot of throttle pressure dialed in. As I explained in an earlier post, I modified the trans end of the rod to have a bit of additional travel after it hits the stop, meaning the throttle valve is pushed in pretty far at part throttle cruising ranges. It does not, however, shift too early @ WOT in "D". I have tried shifting manually at the track at various RPM's (have to go by speed, there's no tach in the Duster ), I always seem to do better with the gas nailed to the firewall and the trans in "Drive". Kickdown can be a little touchy, by the way, but just makes things fun!

D/W

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If it ain't broke, fix it!

I'm fabbing a custom kickdown lever on my 2300 holley to get 3 diffrent kickdown adjustments. I'm using a lokar cable and I duplicated the part where the plastic thingy snaps on, so I have a longer lever fixed to the throttle lever and 3 diffrent hookup devices that pulls diffrent "lenghts" each. Farther one pulls 2 3/4", middle one pulls 2, closer one pulls 1 1/4". Will see how it works.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.