I've been daydreaming about the engine/trans combo I'd like to stick into my Coronet.

I seem to recall that later 727 transmissions had a part throttle kickdown vs. the all or nothing kick down my 69 and 70 cars have.

I know the newer transmissions use a kickdown cable instead of the rod linkage. Is the valve body different too?

Any other differences and when did part throttle kick down feature come into play? Can the newer parts be retrofitted into an older trans?

Or am I just nuts, no wait, don't answer that, I already know the answer

when I pickedup my car, it had a manual valve body in it - kickdown setup gone - has a 3500 stall converter in it (pretty sure) and stamped on bellhousing is TF3 - I eventually want to go back to stock put it in D and go - I've been told that 71 was the 1st year for the part throttle kickdown ( I think) - so the MVB would haveto be removed, and a part throttle KD put in, along with the correct linkage rod - I'm pretty sure on the 71 as first year for PTKD-but I may be wrong - been meaning to ask this very question- maybe we canget a definate - Joe

part throttle kickdown

reading this link I get the feeling that the hyper shifter is an after market purchase.
The OE is looking for info on the stock part throttle kick down. Not sure when it started but I know early 70s. I think 73 but not sure.

(quote)I know the newer transmissions use a kickdown cable instead of the rod linkage.

Cables were used on 65 and older trannies, just use your regular kick down linkage rod, but know that they are specific to 2 or 4 bbl carbs. the later part throttle K/D can be retro fitted into early transmissions, very easily.

yes 71 on the first PTK

later on PTK with limeter built into it keeps it from kick down when over 40 mph

some early 904 ptk valves can be swaped to the 70 back non PTK vb for a PTK function

I just removed the BB 727 VB with PTK and went forward shift,full manual,low band apply VB from CRT

just to drop the linkage headaches on swaping a 440 into my 88 truck

'71 was the first year for PTK in the V8 but it goes back to '67 on the 904 when used on the /6.

The early 904 version had no limit valve but the '71 and later V8 has the limit valve.

A guy just freshened up the trans for my A-100.
One of the things he did was add the part throttle kickdown. It was a separate chunk that bolted on to the valve body. He was swapping a bunch of stuff around, so I don't have the exact info, but I believe it's fully covered in the HP Books Torqueflite A-727 Book. See pg. 113 for a figure.

Thanks for the info, I'll look into the lik and the 727 book.

I have a mid 70s motorhome trans in the shop, I'm hoping it has the PTK parts I need.

Somebody is repopping the PTKD for the early VB. I got one from an old trans guy one time. Told him what I was looking for and he made about 3 steps and had one on the shelf that he had taken out about 25 years before! Told me I could have it since I was the only person who ever knew what it was. That and noody had asked about one since he layed it up there.

I think it is A & A. IIRC it looks different than the OEM part but works the same.

What does the limiter valve in the 71 up trans do versus the early slant six piece w/o it?

The limit valve limits the road speed (about 40 mph) at which PTK can occur, the earlier setup without the valve can be a real PITA with low numeric axle ratios...my '57 NY with 2.94 gears will still PTK at over 60 mph.

hi john,old post but i see you modified your 57 new Yorker with ptk. can ptk be added to a 1965 Chrysler 300L valve body ? did you drill/modify your original valve body or use a later 68 valve body? thanks, ronnie

The pre-'67 valve body lacks the passage that feeds throttle pressure to the PTK module.

To convert a '62-'65 TF to PTK you need to use a valve body casting from a '67-'68, the later ones won't work because they lack provisions for the pump check valves. With the correct VB casting and the PTK module in hand all you need to do is make a bushing to reduce the diameter of the hole the rooster comb fits in.

The throttle pressure passage and the screw that needs to be changed.

Great info there John!

I took a 64 727 trans apart recently and I can see its got a 'modded' 67 VB in there?
The owner says it takes ages to get converter to 'fill and engage' so I'm wondering if this is a wrong set-up?
I am going to find a pre 727 65 VB and se what the differences are...


I'm guessing its something to do with rear pump oil-feed maybe or the missing channel...

Modded how? The PTK mod shouldn't affect converter fill if the shifter is in Neutral. Is it slow to engage both forward and reverse?

how can a 67 VB work in a cable shift 64 transmission ?

Sorry for the delay in getting back to this.

The trans was in a 65 Fury and was always slow in engagement once drive or reverse was selected.
I now have the trans here at home and can see the valve body says 67 on the lower casting plate.
I will remove it today and see how the mod was done to get it to work in a 64 trans?

be back laters lol.
John

that will be interesting for sure.
please post pics if at all possible.
T.I.A.

Oleham2... on a memory REFRESH topic ?

From a who proclaims he CRS ?

gotta get it where ya can DoC !