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Author Topic: Disc Brake Conversion  (Read 1803 times)

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Offline 32 chevy

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Disc Brake Conversion
« on: August 04, 2013, 02:25:50 PM »
I have a 32 chevy with a 72 pinto crossmember and rack and pinion steering. I had this done almost 30 years ago and always thought that the rack unit was a 73. Well i just started looking for a new rack and discovered it is a 72. Well several years ago i ordered a disc brake conversion kit from speedway motors for 74 with 2" drop spindles they said it would fit a 73 also....well now i see that the spindle is taller than my stock ones? due to it being a 72 i assume...What can anyone tell me to do to bail me out of this mess. i saw a posting in the past that you can use the 74 and up on a 71-72 but you need to use different ball joint's etc.  what can i do to use all of these parts????  Thanks

Offline oldkayaker

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Re: Disc Brake Conversion
« Reply #1 on: August 04, 2013, 05:12:27 PM »
There are several options depending on what you want to end up with.
1) From reading old posts here, the late spindle will bolt into the early suspension's ball joints.  The taller late spindle should increase the camber gain on bumps.  I have seen a couple posts saying this works okay but I have not tried it.  The tie rod hole in the late spindle is too large for the early tie rod end.  Using a TRB-65GR bushing from http://www.mustangsteve.com/tierodbushings.html seems to work with some grinding per http://www.fordpinto.com/pinto-faq/adapter-bushings-for-spindle/msg132106/#msg132106
2) You said you were looking for a replacement rack, implying the 72 rack is dying.  These are available from the drag racing companies like Flamming River but are pricey.  You could retrofit with a 74 up rack like FordMasterTech did here http://www.fordpinto.com/general-pinto-talk/build-pics-1973-turbo-coupe/msg102503/#msg102503 this requires some cutting and welding.  Unfortunately the photo links do not work any more, but I saved them to a Word file if you are interested (pm me your email address).
3) You could bite the bullet and swap out the crossmember, arms, rack, etc. to the 74 up design for better parts availability and a little extra strength.  Not sure of the difference but Speedway has a crossmember for a 34 Chevy http://www.speedwaymotors.com/Garage-Sale-Speedway-Mustang-II-Crossmember-for-1934-35-Chevy-STD-Frame,7873.html.  Although not as attractive, you could liberate a 74 up crossmember and associated parts from the junk yard.
 
Note the 74 up hub has a little bigger diameter than the early hub which is a problem if you are using the 72 steel wheels.
 
There probably are other options too, have fun with it.
Jerry J - Jupiter, Florida

Offline 32 chevy

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Re: Disc Brake Conversion
« Reply #2 on: August 04, 2013, 06:07:52 PM »
Thanks alot i will give the adapt. a try...

Thanks alot !!