94 Chevy S-10 Blazer

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Jim - 25 Dec 2005 14:24 GMT

Said SUV has V-6 4.3L Vortec engine and 4 speed automatic transmission.

Intentions: At home, change the automatic transmission filter, replace lost
tranny fluid, then have entire tranny flushed and replaced with new fluid.

Problem: Unable to drop tranny pan as crossover exhaust pipe prevents
dropping pan straight down. Filter and internals prevent any appreciable
side to side or back to front movement of pan. The rear crossmember
location for the rear transmission mount is in the way about 1/2" also
preventing straight down movement, this part of it am guessing is not of
consequence?

What is the normal removal procedure for dropping the tranny pan on this
vehicle?

Would having the crossover pipe moved forward a couple of inches at an
exhaust shop be a better long term solution for self tranny filter
replacement?

Should I have the entire tranny flushed and fluid replaced before the tranny
filter replacement, or the reverse?

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Jonny

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Mike Levy - 25 Dec 2005 19:08 GMT

Support the transmission and t-case and drop the transmission
crossmember.

>Said SUV has V-6 4.3L Vortec engine and 4 speed automatic transmission.
>
[quoted text clipped - 17 lines]
>Should I have the entire tranny flushed and fluid replaced before the tranny
>filter replacement, or the reverse?

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Jim - 26 Dec 2005 12:53 GMT

My son-in-law says to remove the nut that holds the transmission mount to
the crossmember, then jack up the tranny to the floorboard. This will work
on the rear part. As far as I can see, the exhaust crossover pipe will
follow the tranny and engine when jacking the the rear of the transmission.
So, this doesn't address the clearance problem with the front of the
transmission pan with the exhaust crossover pipe. Seems like the pan will
be wedged in there between the exhaust crossover pipe and the tranny
internals after all is said and done. Seems the same way when removing the
transmission crossmember as well.

The pan must come straight down and clear the transmission internals and
filter before the pan can be moved to any side.

Signature

Jonny

> Support the transmission and t-case and drop the transmission
> crossmember.
[quoted text clipped - 20 lines]
> >Should I have the entire tranny flushed and fluid replaced before the tranny
> >filter replacement, or the reverse?

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Mike Levy - 26 Dec 2005 15:18 GMT

You'll get enough room by removing the tranny crossmember. I've seen
it done on a 94 S-10 Blazer 4x4.

>My son-in-law says to remove the nut that holds the transmission mount to
>the crossmember, then jack up the tranny to the floorboard. This will work
[quoted text clipped - 8 lines]
>The pan must come straight down and clear the transmission internals and
>filter before the pan can be moved to any side.

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Jim - 27 Dec 2005 21:09 GMT

Got it done alright. Mine is 2WD.

Used combination method of jacking up tranny, and moving not removing the
crossmember. Removed two bolts on one side of crossmember, one bolt on the
other, and loosened remaining bolt. Moved one side of the crossmember
toward rear. This gave me enough room.

Had to jack the tranny up as the long all-thread from the transmission mount
to the crossmember prevented me from moving the crossmember, even when
there's nothing securing the crossmember. The crossmember will not drop
straight down due the its mounting method on the frame rails.

Driver's side exhaust manifold to exhaust pipe joint is now leaking due to
the movement. Have to replace the "biscuit" now. Had to take the Blazer to
my son-in-law to bolt up the crossmember again. The nut and washer combo
are way inside the frame rail hollow area. Couldn't get fingers inside to
start these to the bolts. Pretty much uneventful, but slow as was being
overly cautious.

Signature

Jonny

> You'll get enough room by removing the tranny crossmember. I've seen
> it done on a 94 S-10 Blazer 4x4.
[quoted text clipped - 11 lines]
> >The pan must come straight down and clear the transmission internals and
> >filter before the pan can be moved to any side.

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