Here is a place that does them, and a few years ago MCG featured one in the magazine. I believe from a place place in Iowa.
http://phoenixtrans.com/html/chryslertrans.html Chrysler A-500 A-518
Introduced in 1989 and 1990 these transmissions are essentially the good, strong 904 and 727 trans with .69 to 1 overdrive added to the rear. 4th gear is controlled electrically, requiring a simple toggle switch to engage 4th gear or lockup in stock applications.
Dimensions are very close to the 904 and 727 except for length and extra bulk in the housing to accept the overdrive assy. All linkages including kick down are the same as the 902 and 727 easing swaps considerably.
A-500 Overall Length 38” Face to mount distance 24 3/8 Ratios: 1st 2.74, 2nd 1.54, 3rd 1.00, 4th .69
A-518 Overall Length 38” Face to mount distance 25 1/4 Ratios: 1st 2.45, 2nd 1.45, 3rd 1.00, 4th .69
Models and Pricing:
#PTA500HD
Our heavy duty replacement trans features durability and shift improvement modifications that bring this transmission's rating up to 325 horsepower. Included is our 1800-2000 stall converter. $1539.85
#PTA500SS
Our street/strip model capable of up to 395 horsepower is modified with high performance bands and clutch packs, special valve body, and servo modifications. Included is our high performance converter with stall speeds up to 2800 rpm. A great trans for the Magnum crate engines. $1745.85
#PTA518HD
Our heavy duty replacement trans for the 318 and 360 engines. This trans features heavy duty components and shift modifications for engines up to 395 horsepower. Comes with heavy duty torque converter with 1800 rpm stall speed. $1642.85
4x4 option ADD $206
#PTA518SS
Our street/strip model capable of 500 horsepower is the choice for the high output engines or those who desire the very strongest trans for their car. This trans features high output bands and clutch packs, valve body and servo modifications, and available stall speeds to 2800 rpm with our high performance lockup torque converter. $1848.85
4x4 option ADD $206
We can build the 518 to use behind the B and RB series engines. ADD $606.67 to the trans price for this option.
