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Old 01-18-2023, 05:07 PM   #1
MySons68C20
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Auto to manual conversion

I want to convert my C20 auto to a 4 speed manual....need the clutch pedal, cross shaft, rod etc.
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Old 01-19-2023, 09:38 AM   #2
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Re: Auto to manual conversion

I have a whole peddle bracket assembly for a manual truck, I'm on the east coast so I'm not sure if it's worth it to ship. But let me know and I can get pics and prices.
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Old 01-19-2023, 12:44 PM   #3
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Re: Auto to manual conversion

That would be great if you don't mind.
Thank you!

Blake
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Old 01-19-2023, 02:08 PM   #4
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Re: Auto to manual conversion

Are you interested in shipping the whole set up, or just pieces? Both pedals pivot correctly
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Old 01-19-2023, 03:10 PM   #5
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Re: Auto to manual conversion

I can't tell if I can bolt the clutch pedal, spring mount etc to my current automatic bracket or not?
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Old 01-19-2023, 05:16 PM   #6
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Re: Auto to manual conversion

I have my auto cab at work. I'll take this out to it tomorrow when I'm back at the shop and compare & contrast the two. Units someone else knows
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Old 01-19-2023, 06:27 PM   #7
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Re: Auto to manual conversion

I'm trying to figure all this out before pulling the trigger.
Thank you!
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Old 01-20-2023, 03:28 PM   #8
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Re: Auto to manual conversion

Yup, looks like the upper mount spring hole is not there on the auto pedals.
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Old 01-20-2023, 06:11 PM   #9
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Re: Auto to manual conversion

So I contacted Modern Drivelines https://www.moderndriveline.com/gm/vehicle-specific/
and they can provide a one stop solution EXCEPT the pedal to the firewall.
It is a hydraulic solution eliminating most of the the mechanical linkage.
If someone has a work around without having to change out the bulkhead (don't know what it's called) that would be appreciated.
Thanks bike for helping me on this!
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Old 01-21-2023, 04:17 PM   #10
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Re: Auto to manual conversion

So referencing the link below it says I can just add on.....
I'm kind of lost right now on best way to proceed?

http://67-72chevytrucks.com/vboard/s...g+clutch+pedal
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Old 01-23-2023, 05:33 PM   #11
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Re: Auto to manual conversion

Silver Sport Transmissions has a clutch pedal they claim bolts up to the stock auto pedal box without having to remove. https://www.summitracing.com/parts/IST-PAG-01001A
I am going to the hydraulic master / slave deal since the all mechanical is so tough to find.
Thank you biketopia for putting up my pms and indecision!

Blake
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Old 01-23-2023, 10:04 PM   #12
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Re: Auto to manual conversion

Quote:
Originally Posted by MySons68C20 View Post
Silver Sport Transmissions has a clutch pedal they claim bolts up to the stock auto pedal box without having to remove. https://www.summitracing.com/parts/IST-PAG-01001A
I am going to the hydraulic master / slave deal since the all mechanical is so tough to find.
Thank you biketopia for putting up my pms and indecision!

Blake
No worries & glad you got something figured out. You'll be real happy with the hydraulic conversion
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Old 01-27-2023, 12:13 PM   #13
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Re: Auto to manual conversion

Pulled the trigger on the Tremec TKX 5 speed kit with all the goodies.
It's supposed to arrive here end of next week.
I'll start a new thread once I do the install.
https://shiftsst.com/blog/post/c-series-67-72.html

Last edited by MySons68C20; 01-27-2023 at 12:13 PM. Reason: missing info
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Old 01-27-2023, 02:00 PM   #14
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Re: Auto to manual conversion

Quote:
Originally Posted by MySons68C20 View Post
Pulled the trigger on the Tremec TKX 5 speed kit with all the goodies.
It's supposed to arrive here end of next week.
I'll start a new thread once I do the install.
https://shiftsst.com/blog/post/c-series-67-72.html
I would definitely be interested in seeing how the install goes. I am currently swapping my truck from 3 on the tree to a 5 speed with a hydraulic clutch. I had to fab up a plate and pushrod to work with my stock clutch pedal. I had no reference measurements, so I based positioning on how much clutch pedal travel I wanted. I have no idea yet what the pedal will feel like.
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Old 01-28-2023, 03:22 AM   #15
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Re: Auto to manual conversion

[QUOTE=hewittca;9171960]I would definitely be interested in seeing how the install goes. I am currently swapping my truck from 3 on the tree to a 5 speed with a hydraulic clutch. You I had to fab up a plate and pushrod to work with my stock clutch pedal. I had no reference measurements, so I based positioning on how much clutch pedal travel I wanted. I have no idea yet what the pedal will feel like.[/QUOTE

Nice job on the plate! Your rod and master cylinder position is quite a bit higher than the SST stuff. There's more than one way to skin a cat!
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Old 01-28-2023, 09:53 AM   #16
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Re: Auto to manual conversion

[quote=MySons68C20;9172176]
Quote:
Originally Posted by hewittca View Post
I would definitely be interested in seeing how the install goes. I am currently swapping my truck from 3 on the tree to a 5 speed with a hydraulic clutch. You I had to fab up a plate and pushrod to work with my stock clutch pedal. I had no reference measurements, so I based positioning on how much clutch pedal travel I wanted. I have no idea yet what the pedal will feel like.[/QUOTE

Nice job on the plate! Your rod and master cylinder position is quite a bit higher than the SST stuff. There's more than one way to skin a cat!
That's one thing I am worried about with my setup. I really had no idea where I should put the master vertically. I just sat in the truck and pushed the pedal and figured out how much pedal travel I wanted, then put the rod where I would get the correct master cylinder travel for the given pedal travel I wanted. I hope it doesn't end up too stiff. We shall see!
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Old 01-31-2023, 01:37 PM   #17
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Re: Auto to manual conversion

[quote=hewittca;9172211]
Quote:
Originally Posted by MySons68C20 View Post

That's one thing I am worried about with my setup. I really had no idea where I should put the master vertically. I just sat in the truck and pushed the pedal and figured out how much pedal travel I wanted, then put the rod where I would get the correct master cylinder travel for the given pedal travel I wanted. I hope it doesn't end up too stiff. We shall see!
I think you are going to be fine.
SST says their deal is 20% less effort than the stock mechanical linkage.
Even if it's the same as the stock setup that's a win!
Please update once you get there.
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