I am having problems with my tranny not shifting. I have a 94 sls with the 4t80e tranny(viscous converter clutch). It doesn't shift out of first and my check engine light comes on when the tranny is supposed to shift. Any suggestions
Can I use a tranny from a STS(4t80e with a torque converter clutch)if needed or do I have to use the one with the vcc?

http://myweb.accessus.net/~090/dtcobd1.html

this gives you the codes ... .. Take care of it right away ..We bought our Eldo from someone who did not ,and it cost us big time . good luck

E&H