Re: Re[2]: {Chrysler 300} Converter Stall Speed

I never could find a factory spec on the stall speed for the J or ram K converter, but I seem to recall that we guessed it was about 1900 rpm. Don Verity might know?

Yes, stock J and ram K highly modified from normal T-flite.

My J trans was rebuilt with a 2500 rpm high stall converter and a '71 and up pump. I was talked into this by a local so-called T-flite "expert." I think he was thinking '71 426 hemi trans not letter car. Anyway, I would do a stock converter on a do-over. Any kind of launch from a dead start just burns up one of the rear tires (no sure-grip on this car!) and the trans will shift up 1st to 3rd if too much wheelspin. Trans shifts extremely quick 1-2-3 at low rpms even with linkage adjusted properly, need deeper throttle to get high shift points but need to avoid wheelspin. So better to nail throttle at say, 25 mph, downshifts from 3rd to 1st, slams you back in the seat but not too much if any wheelspin. Slip is very evident on low rpm starts, fuel economy sucks. John is correct, however, that it doesn't slam or stall engaging drive or reverse and I have curb idle set a little high at about 850 rpm with today's gas. Running somewhat stock cam (unknown specs), PO converted to hydraulic cam setup (I like that, who wants to pull rams to adjust solids?)) with '62 Imperial 4-bolt heads (1.60 exhaust valves instead of 1.74), running stock 3.23 rear (maybe 3:31, per build card, not sure).

IMHO Chrysler engineers knew their "stuff." keep it stock!

Carl B.

------ Original Message ------

From "John Grady" <jkg@xxxxxxxxxxxxxxxxx>

To "James Douglas" <jdd@xxxxxxxxxx>

Cc "chrysler 300 club" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>

Date 1/2/2024 8:20:40 AM

Subject Re: {Chrysler 300} Converter Stall Speed

Hi stall depends only on torque not rpm . The stall number is just that , not turning at all , slip at certain torque . How much it slips at dead start . Slip is also torque multiplication related
use stock ! axle ratio does not matter at all unless racing . Or wanting slip at start ( hot cam)

That said , ram J and K had very special converters “ high stall “ to allow more rpm at dead stop , more initial hp . Why J burned out of hole so easy . Penalty is a small drop in gas mileage , losses , runs hotter , ok with cooling but also a lot less tendency to stall or slam engaging at 700-800 rpm . ( problem with ram F and G )

unless hot cam , low gears ( race start ) stock stall is best . We are not smarter than design guy making that trade

Asnd A transmission sells a really good late cadillac converter adapted to 727 late mopar , i have not tried but plan to . converter tech has improved greatly in 65 years . Cadillac much better than ours .

Be careful input spline on 727 changes size somewhere around 64 or 65 , that coverter probably for later input spline

John

Sent from my iPhone

On Jan 1, 2024, at 11:09 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Does anyone know what the stall speed is on the converters used in 1964 and presumably 1963?

Playing with the final gear ratio. I want to see if a 2.76 would drop the RPM at or near the converter stall speed. That is not a good thing as it will generate heat in the converter if it drops below the stall speed. So, I want to make a graph of each ratio and the RPM from 35 MPH to 70 and see where the RPM is relative to the stall speed.

Thanks, James

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