Also need to learn to proof read twice before posting, CORRECTIONS:
89 Aerostar; blown seal after shifting problems noted over period of about
150 miles, then slippage then blown front seal.
- the trans had seemed to 'hunt' while MAINTAINING CONSTANT SPEED, THIS FOR
ABOUT A WEEK prior to FIRST event.. could feel shifting sensation with NO
change in engine rpm.
Installed used trans, drained, filter replace, filled, checked fill again,
sensitive to the 'hunting' sensation.. some small indication of same but
nowhere near the extent of previous, otherwise
shifted fine EXCEPT a couple times where slight 'tip-in' resulted in
shift-up, rather than down.
Otherwise trans shifted well and solidly. No thump,, no hesitation.
BUT front seal blown again in 65 miles.
What I might have done wrong:
Did not replace front seal, showed no wear on pump collar. or evidence of
long term leakage in bell hsg
Did not mount TC and check for run-out prior to install
Did not check for pilot bush integrity
Re-used the VSS on the van, instead of the one that came with the salvage
- - - - - - -
So it comes down to either a mechanical problem... or a bum VSS.
I have seen a hint on web research that inop VSS happens at same time as
blown front seal.. so they may be related. In one of those there was a
cryptic ref to high pump pressures..
BUT; this is an 89, not one of the later versions where the PCM controls
everything, right? Will a faulty VSS in this series result in PCM trying to
engage two clutches at once? And does that result in the symptom.
What I did right:
Stopped as soon as possible when I noticed traili blue smoke... trans did
not slip or otherwise act up, so I may have saved it. Though I'm obviously
going to have to get a new TC.
AND YES... I am kicking my own arse, well and often for short-cutting
So, does anyone here with expertise have advice? I cant afford a full
rebuilt at this time.
DOES THE VSS cause these symptoms and result??
(Cruise Control didnt work either, natch, but hadnt for at least 25,000
prior to any indications of fault)
And how much can I expect to spend for the TC?
Or am I dealing with a rare case of faulty PCM?
-- - - --
Some slight indications of 'surge' in idle/Park or stopped in gear. But vac
modulator clear and no leaks. As I said smooth no-hesitation shifting
Took care to properly align detents to shift lever, verified kick-down cable
free to adjust and lever moves freely. And, as noted, used MLPS that came
with used Trans.