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GTO
Main | Auto to Manual Swap | Muncie
Rebuild
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GTO Automatic to Manual
Transmission Swap
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The
most
difficult thing
in doing this swap is probably finding all the
parts needed. Most stuff is being reproduced, but some things
still aren't. Converting can also be tricky depending on what
year GTO you have.
In my searching for parts, I've found out some things about the '67 as
well as other years which might be of interest:
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- Pilot
bushing: Most if not all 60's
and 70's
Pontiac cranks are machined to accept a pilot bushing, unlike some
other makes of cars.
- Z
bar: 64-66 cars share
the same Z bar, clutch rod components, and pedal assembly. 1967 uses
unique one year only Z bar, rod components and pedal assembly.
- Pedals:
When putting in
clutch and brake pedals, you don't need the pedal housing; the clutch
and brake pedals will bolt right in where the automatic brake pedal was.
- Driveshaft:
64-66 2 speed
automatic and manual trans 2 dr cars (also 1967 2 speed auto 2dr Lemans
and
Tempest) use the same driveshaft which measures 60" from U joint center
to U joint center. 1967 GTO's with the TH400 automatic
(otherwise
known as the M40) used a slightly shorter driveshaft, at 59.34" from U
joint center to U joint center.
- Crossmember:
64-72, You
can keep your existing crossmember; there's no difference between an
automatic from a manual equipped car, but read on for its location....
- Crossmember
location: 64-66
GTOs Lemans Tempests
crossmember location is the same for 2 speed automatic cars and manual
trans cars.
- Crossmember
location: 67 Hardtop:
Frames have two sets
of holes for the crossmember. The TH400 auto crossmember sits
back about 6 inches from the manual trans crossmember
location.
For hardtop cars, just move the crossmember forward to the front set of
holes.
- Crossmember
location: 67 GTO
convertible: It's not that
easy for convertibles or for hardtops
with the heavy duty frame option: The factory welded tabs
to
the
inside of the frame rails to
mount a special narrow
crossmember.
You'll have to weld new tabs 6 inches forward.
- Crossmember
location: 68-72
cars also have two sets of holes,
and the convertibles don't use
tabs,
so no welding is necessary for either frame type.
- Z
bar tab 64-67 cars will
need a tab welded to the frame to mount the outboard ball stud for the
Z-bar. Note the exploded view below to see the tab.
- Z
bar tab 68-72 cars have
a bolt on tab.
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Parts needed:
(See the exploded views. Click on them to view large size)
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 Transmission.
I
got a muncie but if you're on a tight
budget, consider a 3 speed manual. They're super cheap and
later
you can upgrade as your budget allows. Get a yoke with it if you
can.
- Driveshaft, needed
only for 67 and later.
- Flywheel.
There is a large I.D. model and a small
I.D. model. I'll post as soon as I find out what is what.
- Clutch.
Stock is
10.4 inch
- Bellhousing and clutch
fork. Bellhousing was the same
from about '65 to '77 (#9785581)
- Z bar and rods that go
from
pedal to z bar and z bar to clutch fork.
- to be cont.
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Frame / Crossmember
information
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 My
GTO is a 1967 convertible. This is probably the
most difficult combination to convert. Regular frames have
two
sets of holes; a rear set for a TH400 automatic, and a forward set for
a manual trans. The heavy duty frames can't use these sets of
holes so Pontiac welded tabs to support the crossmember. The
tab
only had one set of holes so if you want to swap to a manual, it is
necessary to weld new tabs in front of the original tabs. In
the
first picture you can see the 8 holes on the left are for the hard top
style frame. You can also see where the inside frame rail
(heavy
duty or convertible option) is welded on and the location of the
tab.
 1968
and later GTO's have two sets of holes also, but they drilled access
holes in the bottom of the frame and mounted the crossmember on
top. So no welding is necessary for new tabs.
Of course, hardtop owners with regular frames need not worry about any
of this, they only need to move the crossmember up and bolt it down.
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Home
| About
| Links
GTO
Main | Auto to Manual Swap | Muncie
Rebuild
Jeeps
| Minibike |
My
GTO is a 1967 convertible. This is probably the
most difficult combination to convert. Regular frames have
two
sets of holes; a rear set for a TH400 automatic, and a forward set for
a manual trans. The heavy duty frames can't use these sets of
holes so Pontiac welded tabs to support the crossmember. The
tab
only had one set of holes so if you want to swap to a manual, it is
necessary to weld new tabs in front of the original tabs. In
the
first picture you can see the 8 holes on the left are for the hard top
style frame. You can also see where the inside frame rail
(heavy
duty or convertible option) is welded on and the location of the
tab. 
1968
and later GTO's have two sets of holes also, but they drilled access
holes in the bottom of the frame and mounted the crossmember on
top. So no welding is necessary for new tabs.
