trans. problem 1988 TOWN CAR Help please

Hi I have a 1988 town car 5.0 When I'm in overdrive and hit the smallest hill seems not to down shift, You have to shift it by manual. Yes the Linkage is hooked up.It shifts fine when it up shifts . Any suggestions? Thanks Danny its an AOD trans.

I believe your car has the vacuum. modulator. Bolts onto the back of the trans and has a vac. line connected to it. The vac line runs from the intake manifold to the back of the trans. Its usually a metal line with rubber hoses on each end. Could be a bad modulator or you line has come loose or the rubber hose is split on the ends. :2cents:

Mike

I believe your car has the vacuum. modulator. Bolts onto the back of the trans and has a vac. line connected to it. The vac line runs from the intake manifold to the back of the trans. Its usually a metal line with rubber hoses on each end. Could be a bad modulator or you line has come loose or the rubber hose is split on the ends. :2cents:

Mike
I didn't thank it did but Ill check it.Its got a kick down linkage hooked to the trottle body.It shifts perfect all the time just won't down shift from over drive.But it will manually tho.Its an AOD tran.

I didn't thank it did but Ill check it.Its got a kick down linkage hooked to the trottle body.It shifts perfect all the time just won't down shift from over drive.But it will manually tho.Its an AOD tran.
This is the problem and how to adjust it .

http://www.lincolnsonline.com/tech/00138.html

Also very helpful money saver

http://www.lincolnsonline.com/tech/00052.html

Hi I have a 1988 town car 5.0 When I'm in overdrive and hit the smallest hill seems not to down shift, You have to shift it by manual. Yes the Linkage is hooked up.It shifts fine when it up shifts . Any suggestions? Thanks Danny its an AOD trans.
Kinda acts like it jumper time

Hi it all come down to a pugged exhaust causing loss of power. fixed the problem $170.00 .If the motor don't run right the transmission won't shift right.I'm just glad I found the problem before I burned the transmission out.Thanks for the help. Danny