Question : 5-Speed Swap

[Husky]

Looking to pull the GTP out of the storage garage it's been in for a few years, and start working on it again. Now that I've got a daily driver, I figure I might as well do a 5-speed swap for it. What all cars can I get the transmission itself out of, or am I stuck with W-Bodies? And if that's the case, anyone care to make a quick list of all the parts I'm going to need?

[GTP091]

Looking to pull the GTP out of the storage garage it's been in for a few years, and start working on it again. Now that I've got a daily driver, I figure I might as well do a 5-speed swap for it. What all cars can I get the transmission itself out of, or am I stuck with W-Bodies? And if that's the case, anyone care to make a quick list of all the parts I'm going to need?

Only the W-bodies had the 284 in them and with that only the dohc had the 284 option, so they are hard to find. I found a 92 grand prix SE with a 284 in it and im planning on going back to the junkyard to pull it all out. I'm looking at doing a swap myself. You can put a 282 in the car but apparently need modifications done to get it in right, the 284 just bolts in and you only have to splice a few wires.

This is a list I've gathered from posts on here:

284 5 speed transmission
2 front axles
Intermediate Shaft Mount
Intermediate Shaft
5 speed pedal bracket assembly with pedals and switches,
5 speed specific Firewall Plate,
Clutch Reservoir,
Clutch Line & Master/Slave Cylinder,
Trans. case breather tube (metal tube that mounts to strut tower),
2 - Shifter Cables,
5 speed center console

[Husky]

282 was just the 5-speed they used with 2.3s, no? Why would it need to be modified?

[n_c_mail]

what about the 5 speeds out of the early 90s 3.1 L beretta's...could they be used on a 3X00 set up??

[Barry]

what about the 5 speeds out of the early 90s 3.1 L beretta's...could they be used on a 3X00 set up??

Yes, that is the hm 282.

Yes the 282 was used on the 2.3's as well, but those got a different bellhousing(swappable to v6) and shorter gears

[GTP091]

282 was just the 5-speed they used with 2.3s, no? Why would it need to be modified?

Not entirely sure but if I remember right the mounts are different and there is a difference in how it bolts up. It sounds like this swap is a pain in the ass to begin with so making it easier with the right parts is good start.

[3XTurboAgain]

i just completed the 5 speed swap on my GP and used a 282 out of a GP. The NON-wbody 5 speeds wont bolt up because the lower mounting holes are different. I was told you could make it work with a drill/ tap n die but i myself prefer direct bolt ins. Find a v6 w-body with a 5 speed and take everything from that car. Pre 91 is a 282, post 91 is a 284 i believe.

[n_c_mail]

thank u guys appreciate i the input

[OldSkoolGP]

You can use a 282, but if you're bolting it up to a 3.4 you need to be careful because they weren't built to handle a ton of power. They can be modified with tougher parts to handle more power, but stock they are not that strong. A 284 on the other hand is pretty much bullet proof. The internals are pretty much indestructible except for the synchro on 2nd which has wear issues, but a competent stick shift driver will have no problems.

Whatever gearbox you decide to go with, you will need to source all of your parts from a car that had that gearbox. The 282 and 284 had big differences in how they operated, especially with the clutch hydraulics. A 282 hydraulic clutch system will not work on a 284, and vice versa. If you choose to go the 284 route, I have some extras of the parts you will need. I have a complete hydraulic clutch setup and a sparwe flywheel. I may have other parts as well but I can't remember at the moment.

[GTP091]

I couldn't imagine that the flywheel would need to be changed to go from auto to manual. Those would be the same part wouldn't they??

[OldSkoolGP]

Automatics don't have a flywheel. They have a thin sheet metal flex plate that bolts to the crank and the torque converter.

[Husky]

284 5 speed transmission GOT IT
2 front axles GOT THEM
Intermediate Shaft Mount GOT IT
Intermediate Shaft GOT IT
5 speed pedal bracket assembly with pedals and switches, GOT IT
5 speed specific Firewall Plate, GOT IT*
Clutch Reservoir, GOT IT
Clutch Line & Master/Slave Cylinder, GOT IT



I still need...
Trans. case breather tube (metal tube that mounts to strut tower),
2 - Shifter Cables,
5 speed center console

OldSkool, got the cables and brackets for them laying around? Also, do I even -need- the breather tube? The Z34 I was pulling this from didn't have one.

[GTP091]

Automatics don't have a flywheel. They have a thin sheet metal flex plate that bolts to the crank and the torque converter.

Interesting... I thought the geared disc that the starter engages on is the flywheel?

[GTP091]

284 5 speed transmission GOT IT
2 front axles GOT THEM
Intermediate Shaft Mount GOT IT
Intermediate Shaft GOT IT
5 speed pedal bracket assembly with pedals and switches, GOT IT
5 speed specific Firewall Plate, GOT IT*
Clutch Reservoir, GOT IT
Clutch Line & Master/Slave Cylinder, GOT IT



I still need...
Trans. case breather tube (metal tube that mounts to strut tower),
2 - Shifter Cables,
5 speed center console

OldSkool, got the cables and brackets for them laying around? Also, do I even -need- the breather tube? The Z34 I was pulling this from didn't have one.

The donor manual 92 Grand Prix SE I found had what looked like a vacuum pump on it as well... It didn't look like it was connected to the tran in any way but was mounted underneath the passenger side fender. I've only ever seen this on manual cars with the 284. No idea what it is though.

[gpchris]

Interesting... I thought the geared disc that the starter engages on is the flywheel?

Technically that is the starter ring gear. Most of the time it is attached to the flywheel/flexplate but not always.