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Old 07-03-2017, 07:28 PM
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Question 69 Camaro transmission swap can't make up my mind

I've been trying to read up on what all it would take to convert my automatic 69 Camaro to a manual 6 speed and there's almost too much information on the internet on the subject to draw a final conclusion.

I have 70's 454 Big Block engine I'm hoping to get around 600hp at the flywheel.
The transmission I'm looking at is: ProFit MAGNUM Installation Kit for 1967-69 Gen 1 F-body (Camaro/Firebird)

I planned on having a mechanical clutch system vs having a hydraulic system because it sounds less expensive and easier to understand. But I can't find a kit to convert my automatic to a MECHANICAL clutch assembly, there's 100's of hydraulic options. Is choosing mechanical over hydraulic the right choice for the reasons I listed?
I've read a little on the firewall flexing when pressing the clutch pedal but never read a solution.

I'm also having trouble finding the correct bellhousing.
I have a Monster Stage 3 clutch kit in my shopping cart, looking to get a list of what all is needed.
I still have the automatic pedal assembly hooked up, all I have as of now is an engine and an idea. Stock 168 tooth flywheel.

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Old 07-03-2017, 08:01 PM
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One problem with the T-56 is the double overdrive, 5th gear will be useable for you but 6th gear, which is a .50 overdrive, will be worthless as the engine will not like being pulled down that low on rpm at cruise. It will buck and load up and act sluggish.

I think you'd be a lot better off considering a Tremec TKO-600 5-speed overdrive. It has a better overdrive ratio, and will be a lot easier to fit.

That kit you've linked is awful expensive considering how little that is in the kit.

Mechanical clutch linkage packages can be found from most F-body restoration parts suppliers/companies, and you can find kits on Ebay too.

Your reference to firewall flex is only an issue with hydraulic conversions and their mounting of a clutch master cylinder on the firewall. Mechanical linkage kits install in place of your current automatic brake pedal, on the same reinforced under-dash bracket. Flex isn't an issue.

I would assume you want a steel bellhousing, either QuickTime, Lakewood, or McCleod.
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Old 07-03-2017, 08:08 PM
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Does Tremec have a kit that'll place the shifter in the stock location so I could still use the 69 Camaro center console?
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Old 07-03-2017, 08:38 PM
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If I was going to do an overdrive I wouldn't use a 6 speed. It's too large and requires transmission tunnel modifications, and too much overdrive. The 5 speed transmissions are plenty in my opinion. Silver Sport Transmissions and others offer direct fit kits that place the shifter in the correct location. I don't know if Jody's Transmissions has a direct fit kit or not, but you might want to contact him.
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Old 07-05-2017, 01:04 PM
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The tremec has options for location of shifter so it should go in with the shift in the proper location. Other than that it is a fairly standard deal to replace an automatic with a manual trans.

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Old 07-05-2017, 03:13 PM
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Bellhousing alignment with a Tremec is critical. The use tapered bearing sets, in lieu of ballbearings. Most tremec resellers want you to use a caged needle pilot bearing which is also less tolerant of misalignment.
The only roller pilot bearing I'd trust is the GM one. I used to have the P/N around, but I can't seem to scare it up
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Old 07-06-2017, 07:12 AM
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IMHO I think you are better off using the hydraulic clutch conversion. To engineer the linkage with the correct throws so it has the right "pedal feel" could be a lot of trial and error. If you go with the hydraulic conversion kit the engineering is all done.

Also like said, with the double overdrive you'll probably never use 6th. One of my buddies had a Viper and he said you never use 6th, it just lugs the engine down to much.
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Old 07-06-2017, 08:08 AM
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Quote:
Originally Posted by AutoGear View Post
The only roller pilot bearing I'd trust is the GM one. I used to have the P/N around, but I can't seem to scare it up
GM 14061685 It looks like.
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Old 07-06-2017, 04:36 PM
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Quote:
Originally Posted by Big_Wrench View Post
IMHO I think you are better off using the hydraulic clutch conversion. To engineer the linkage with the correct throws so it has the right "pedal feel" could be a lot of trial and error. If you go with the hydraulic conversion kit the engineering is all done.

Also like said, with the double overdrive you'll probably never use 6th. One of my buddies had a Viper and he said you never use 6th, it just lugs the engine down to much.
You don't have to engineer linkage at all, the factory mechanical linkage works just fine.
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Old 07-06-2017, 06:08 PM
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Call Jodys Transmissions and ask about the Legend.
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Old 07-07-2017, 06:26 AM
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have you looked at gear vendor over drive unit to add to a Muncie 4 speed.
I recently put one in my 68 Camaro . the only modification was the driveshaft had to be shortened. I have 550 hp at the flywheel and 511' of torque
I run 26" tall tires with a 3:55 gear. at 50 mph in 4th I turn 2150. in OD I turn 1700.
55 mph 4th is 2300 OD is 1900
60 mph 4th is 2600 OD is 2000
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Old 07-07-2017, 09:29 AM
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Just make sure your Muncie has the correct amount of 1st gear for your application, and that the case doesn't leak from the countershaft pin bore...I'd hate to see you invest in an external overdrive and have the stock Muncie crap the bed.

Do NOT use the GearVendors as a 'ratio splitter' (ie 1st-1st over-2nd-2nd over). Fine for an automatic, thanks to their ability to absorb driveline shock, but stickshifts do not hold up well. Even old literature from BorgWarner and Laycock tells the owner not to engage the overdrive under motion in 2nd gear.
If I was going this route, M20 or M22W with a 3.73 rear axle and the gearvendors.
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