In my suburban ('88 EFI 350 TH400, I think, does TH400 have OD?)
when i get up around 50+ mph i get a horrible vibration throughout the undercarraige, Im hoping its not tranny... any ideas?
it goes away when i back off the throttle and get down to around 45 mph
$300 pulled from a junk yard :x
runs good...nice body...nice interior...