General Motors 700R4 Rebuild
During a rebuild on Tom's 700R4 Transmission in his
87 Chevy 1/2 ton 4x4 truck, we decided to document and
bring the basics of the task to the web page.
To follow is just the basics and is
not a course in doing this for the first timer. Numerous tools are needed as well
as measuring devises to make sure everything installed is just right.
We
would suggest, you load the exploded view from the button below (java only)
(which will open in a new window) to follow all that is going on in
the pictures and switch from one window to another as needed. Again, this is only
a guidline, and not a class in automatic transmission rebuilds. If this interests
you, get a good rebuilding book and then ask lots of questions of the professionals
that do this as a profession in your area. Another note: I did this in multiple pages,
so just move from page to page at the bottom. This entails over 50 images to
explain so please be patient to the slow loading pages, but I tried to keep
each page down to as few images
as possible to explain each procedure. Ok, nuff said, here we go!
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It would be too time consuming to cover
the whole tear down and rebuilding process (ie... double of the same picture
with the first set looking at a dirty transmission) so we opted for the rebuild.
Incase there is an interest; we did the rebuild because Tom was
loosing second gear and upon inspection of the valve body upon teardown, we
realized that the 1-2 accumulator spring was busted into about 10 peices, but since
Tom had put a few miles on it since it started screwing up badly, I suspected
the forward clutch pack (#47 for those looking at the exploded view) was burnt, so we opted to do a complete overhaul.
As it turned out those were burnt along with the 2-4 band assembly (#2).
This is the view of the bottom of the case where the seperator plate, gaskets,
and valve body will eventually be remounted. |
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Here is a view of the top or throat of
the case. This is where we will start the assembly. |
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The above shows the bench pile of parts that
(once cleaned) will be put back into the case in the reverse order of removal.
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Here is Tom cleaning the Lo-Reverse clutch piston
(#94) in prep for the seals(#95). |
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The above shows the piston (#94) installed
in the case. A mixture of Vasoline Petroleum Jelly and Transmission Fluid is
mixed ahead of the rebuild and used to coat all seals prior to installation. A
special seal tool is required to install this piston then the Lo-reverse spring
assembly (#93) is installed and using another special tool compressed so the clutch
snap ring (#92) can be installed. |
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Shown above is the Reaction Internal Gear
(#83) and Support (#84) along with the rollers bearings (#82 & 91). |
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This is the Reaction Carrier Assy (#80)
that will fit into the reaction gear as described above along with a well
lubed roller bearing and the reaction sun gear (#71). |
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And here is every thing just mentioned above
installed into the housing. |
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Here is the view with the Lo-Reverse clutch (#81)
assembly in place, with support assembly (#77), roller clutch (#76) and roller retainer (#75)
installed. The support retainer (#78) must be installed before the support assy (#77) and
guided into place in kind of a snapping motion to lock it. and then the thrust washer
(#72) is installed. |
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Here is a view of the reaction shell (#68) with
the old Reaction shaft thrust washer(#67) in place ready for cleaning. |
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