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Old 04-07-2021, 04:11 PM   #1
pwdcougar
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70 emergency brake and wiring in a 68 firewall

My donor truck is a 68 and I'm looking to swap in the wiring and ebrake from my 70. Anyone done this? I can see that the firewalls are different from my tear down pics. The green/blue is the 70 and the saddle is the 68
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Old 04-07-2021, 04:48 PM   #2
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Re: 70 emergency brake and wiring in a 68 firewall

Interestingly enough the problem is actually with the location of the 68's fusebox, you will need another hole for that cause it needs to move over.

I would make a template of the firewall for the 70 but start with that particular mod before worrying about the brake placement.
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Old 04-07-2021, 05:37 PM   #3
BigBird05
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Re: 70 emergency brake and wiring in a 68 firewall

Instead of a template I would cut out the firewall from the 70 and weld it into the 68.
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Old 04-07-2021, 06:27 PM   #4
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Re: 70 emergency brake and wiring in a 68 firewall

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Originally Posted by BigBird05 View Post
Instead of a template I would cut out the firewall from the 70 and weld it into the 68.
Unfortunately the 70 firewall is long gone! I'll have to find a source for a template
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Old 04-07-2021, 06:33 PM   #5
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Re: 70 emergency brake and wiring in a 68 firewall

If it were me Id remove fuse box, install e brake, then eyeball the new location for fuse box. Then weld up old fuse box hole.

If you want it to be perfect, as has been suggested a later firewall would be handy, you might be able to find a garbage cab at the junkyard to cut it out of.

Good news is it is quite doable, the e brake itself should need no modification.
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Old 04-07-2021, 06:41 PM   #6
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Re: 70 emergency brake and wiring in a 68 firewall

Quote:
Originally Posted by dagnabbitt View Post
If it were me Id remove fuse box, install e brake, then eyeball the new location for fuse box. Then weld up old fuse box hole.

If you want it to be perfect, as has been suggested a later firewall would be handy, you might be able to find a garbage cab at the junkyard to cut it out of.

Good news is it is quite doable, the e brake itself should need no modification.
Thanks

I didn't take great pictures of how the ebrake goes in though. Between the two pics I'll take your advise and eyeball the fuse block location.
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Old 04-07-2021, 06:54 PM   #7
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Re: 70 emergency brake and wiring in a 68 firewall

Wes at classicheartbeats (?) did it to a suburban but that part of his build doesnt seem to be available online anymore, maybe he can help. Good luck!
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Old 04-07-2021, 09:17 PM   #8
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Re: 70 emergency brake and wiring in a 68 firewall

Why do you want to run the 70 harness? Is it because of the P.B. taking up the space were the 68 fuse block is now?
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Old 04-07-2021, 11:33 PM   #9
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Re: 70 emergency brake and wiring in a 68 firewall

I put a 72 brake assembly in my 67. I just rotated the fuse block 90 degrees so it sits the long way up and down. It's a tight fit next to the brake assembly but it fit. Just drilled two new holes for the fuse block once it was rotated. I had to drill holes for brake assembly and install that first.
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Old 04-08-2021, 11:19 AM   #10
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Re: 70 emergency brake and wiring in a 68 firewall

Quote:
Originally Posted by lugnut View Post
I put a 72 brake assembly in my 67. I just rotated the fuse block 90 degrees so it sits the long way up and down. It's a tight fit next to the brake assembly but it fit. Just drilled two new holes for the fuse block once it was rotated. I had to drill holes for brake assembly and install that first.
Great information thanks. Is the installation of the 72 e brake pretty much intuitive?

Thanks

Paul
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Old 04-08-2021, 11:53 AM   #11
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Re: 70 emergency brake and wiring in a 68 firewall

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Originally Posted by pwdcougar View Post
Great information thanks. Is the installation of the 72 e brake pretty much intuitive?

Thanks

Paul
For the most part it is but I did some other things along the way that made it easier. I was replacing the full dash anyway f to install AC so I used one from a 72. That one has the hole on the bottom just above where the new foot pedal brake handle will be. Then I just made a template of cardboard from the 72 firewall to make sure my two bolt holes lined up for the assembly. A bit of trial and error but it is solid and functions great. I also got a new cable for a 72 while I was at it.
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Old 04-08-2021, 02:54 PM   #12
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Re: 70 emergency brake and wiring in a 68 firewall

Quote:
Originally Posted by BigBird05 View Post
Why do you want to run the 70 harness? Is it because of the P.B. taking up the space were the 68 fuse block is now?
My 70 harness is in much better condition compared to the one from the 68. The main reason for the ebrake swap is the 68's was mia.
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Old 04-08-2021, 04:04 PM   #13
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Re: 70 emergency brake and wiring in a 68 firewall

A picture of a 72, possibly it will help?
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Old Yesterday, 05:05 PM   #14
pwdcougar
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Re: 70 emergency brake and wiring in a 68 firewall

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Originally Posted by Accelo View Post
A picture of a 72, possibly it will help?
Thanks!

Can someone take a pic of the placement of the ebrake assembly under the dash?
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Old Yesterday, 06:58 PM   #15
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Re: 70 emergency brake and wiring in a 68 firewall

Quote:
Originally Posted by pwdcougar View Post
Thanks!

Can someone take a pic of the placement of the ebrake assembly under the dash?
Here is my 67 converted with the fuse block rotated.
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Old Today, 12:29 AM   #16
pwdcougar
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Re: 70 emergency brake and wiring in a 68 firewall

Quote:
Originally Posted by lugnut View Post
Here is my 67 converted with the fuse block rotated.
Thanks! The pictures will be a big help!
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