A999 as a street/strip trans.

motorpirate said
So Dany's Magnum swap has been successful enough that it is starting to eat the original 18 spline 100K mile trans. No suprise...
So we want to build a "later" trans for it and save the '66 unit to use with the 273 in another project.
However, finding a core locally has proved harder than I would have thought.
The only thing I have found close is in a 1985 van.
From what info I have "if" its not a 727 (don't want it) then it must be a 999 with a lock up converter.
I have read every 999 thread on here I could find and don't see a clear answer to how to use an aftermarket converter with this trans, Or I am to dense to understand the answer!!

So what we would like to know is:

Can you change the input shaft/pump to accept a standard "off the shelf" converter?
If so, what year/application parts.

Has anyone had a "performance" converter built with the lockup converter splines?
Or had anyone rebuild the lockup converter as a high stall?

We are not really interested in retaining the lock up feature and are just looking to raise the stall speed a little over the stock '66 converter.

Is it possible the van converter has a higher stall speed than what we have now in spite (or because of) the lock up feature?

I only have about $600 to spend on this including the purchase of the trans itself (knocking out the drag radials we thought would be our next upgrade) so I don't think a custom converter is in the cards if we are to get back to the track this season.

If you aren't familiar with Dany;s project in the Magnum Swap and racing forums here are the details.

'66 Barracuda
5.9 Magnum with lunati 20200715 roller.
Dougs headers
8.25 with 3.55's SG and 26" tires
3200 lbs with driver.
Best of 14.42 @98.6 MPH with a terrible 60'

Thanks so much guys, we would never have made it this far without all the help from this site!!!

I converted mine by finding a slant six pump and input shaft and I went with a manual shift valve body.
A 999 will probably have the low gear set and possibly the 5 clutch drum with a beveled stator and high gear drum. If you want to use the beveled 5 clutch drum in a non lockup application, you will have to have the bevel custom machined onto the non lockup slant six stator. Or your other option is to use a 4 clutch drum with thinner frictions to get 5 clutches.
The other area of concern is again with the stator. If you use the forward clutch hub from the 999 with the slant 6 stator, the sealing ring bore diameter needs to be machine bigger by .060 thou.
If machining is not available, then you could also use the slant six forward clutch with the slant six stator, but your clutch count will be less because of the snap ring location.
Do not use a non lockup forward clutch with a lockup stator or you will have a no drive situation because of the difference in sealing ring diameter(.060) mentioned. Be sure your end plays are within spec.