55-59 TCI under cab brake booster
 

Looking to see if any of you have installed this unit on your trucks and if you had an alignment issue with the original hole in the firewall for the pedal. Mine is roughly an inch and a half off center to the outboard side of the hole.

Re: 55-59 TCI under cab brake booster
 

Picture of unit

Re: 55-59 TCI under cab brake booster
 

I bought mine off ebay, did not say TCI brand, but fits perfectly.
https://i.ebayimg.com/images/i/22183...0/s-l140/p.jpg

Re: 55-59 TCI under cab brake booster
 

I had a problem like yours, but not 1 1/2 only a half . I ended up leaving the adapter piece off that goes to pedal . Used a large washer for shim to center arm hole . Then used the original hole in the arm, and made connection, Works great ! Also shimmed ,with washers behind the mount plate

Re: 55-59 TCI under cab brake booster
 

Thanks for the reply. Not sure why it is so far away from center. I could work with half inch but inch and a half means completely rebuilding the arm. Checked cab being squared up to frame.

Re: 55-59 TCI under cab brake booster
 

Do you have the stock brake pedal arm. it should be the same, you could try it should fit

Re: 55-59 TCI under cab brake booster
 

You could make a spacer and mount the unit to the spacer .
Some nice thick round stock and a plate and stiffener arm from the inside bolt on the boaster to the frame. this will make it stay ridged while applying the brakes.

Re: 55-59 TCI under cab brake booster
 

sack54 unfortunately I do not have the stock pedal or the original master cylinder. The original mounting bracket that was riveted to the frame was gone so I was lucky enough to get one from a member on the site. Pretty sure it was from a 57 truck so it should be the same as my 56.

Re: 55-59 TCI under cab brake booster
 

I will measure my mount for you my truck is a 56 GMC

Re: 55-59 TCI under cab brake booster
 

Sack54 thanks that would be great!

Re: 55-59 TCI under cab brake booster
 

Checked it out today for you, from the frame out measures 3 7/8 to top of mount

Re: 55-59 TCI under cab brake booster
 

Sack54...Thanks for taking the time to measure for me.