[agon]

the transmission on my 65 is a three speed automatic... for some reason it has a hard time shifting into third which is right at 45 mph. it will shift up but immediately goes back down, making the car jerk violently. it does this like three times and then finally stays in third. what's causing this?

[heavy metal]

i suggest firstly to do a trans service,and add some Lucas as well....make sure the shift linkage is adjusted properly also....

[cindys_sn95]

heavy metal is right,try service first W/lucas.check kickdown linkage.

[fastbck65]

check vacuum source as well it may have a pinhole in the vacuum hose to the tranny. w/o proper vacuum it won't shift into third or won't shift at all.

[agon]

i'm a rookie in this... where's the vacuum source?

[CPRsm]

on the back of the intake and runs down to the back of the trans to a little round 1 1/2" vacuum modulator that sticks out 2".

if it is hooked up then take to a shop

[agon]

thanx.
here's another question... i just noticed that one the lines that goes to the transmission is leaking where it connects. could this be part of my problem?

[fastbck65]

Time to check your fluid! And please tighten your tranny line connections check the radiator side of the lines as well.