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12-01-2003, 09:13 PM | #1 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Disc brake conversion?
What do I need to get off a 71/72 to put disc brakes on my 70 GMC?
Where do I measure my rear end to see if I can use later model axles in my rear end? Thanks, Krue.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
12-01-2003, 09:33 PM | #2 |
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Location: Sherwood AR
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i would (and have) used 73-87 parts. The brake hoses are more available, calipers are cheeper ..........git it all: crossmember, brake lines all the way to master cyl, master cyl, prop valve, booster,booster bracket, rod to brake pedal, rear brake line to the coupling
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67 C-10 shortwide '06 Triumph Thruxton '09 Harley 'Lectra Glide '95 Z-71 two door Tahoe |
12-01-2003, 09:53 PM | #3 |
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71-72 five lug rear ends measure 57" between the backing plates. The shorter axles measure 30 1/4" and the 71-72 longer axles measure 31".
Jim |
12-01-2003, 10:42 PM | #4 |
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Join Date: Aug 2001
Location: Castlegar B.C. Canada
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well you need spindles, ball joints, calipers, rotors, proportioning valve, master cylinder, tools, band aids and beer
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Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life |
12-02-2003, 01:59 AM | #5 |
My son, my joy.
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Lots of Band-aids and beer.
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12-02-2003, 04:22 AM | #6 |
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don`t forget that the ball joints are a different size on 71 and up. i`ve heard some people have done the swap without changing anything and others say you need diferent ball joints,tierod end,drag link ect. not sure who is right but i`m getting stuff from a 71 up truck to make sure everything fits my 68.
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Anthony |
12-02-2003, 05:06 AM | #7 |
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The ball joints on a 71-72 are sized different than the earlier ones. Same with the tie rod ends. I pretty sure you need the drag link changed too. The good news is that the ball joints are a direct replacement in the older control arms. Or you can just change out the whole control arms with the ball joints. Then you don't have to worry about pressing the lower ball joint out.
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1968 Chev SWB with 1998 Corvette LS1 305hp and 320 ftlb to the wheels (stock engine!) AEM EMS and wideband O2 sensors Bowtie Overdrive's 700R4, stage 3 Baer 4 wheel discs and 20s http://iciclelanding.com/aperture?album=2049&view=album |
12-02-2003, 06:57 AM | #8 |
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Better yet is if you can find a complete front end assembly off a 71 or 72 thats in better shape than your own. Its well worth it if your ball joints etc. are on their way out anyway. A very quick and easy swap too! Just be aware that pitmans from power steering and non-power steering have different size spline holes for the steering box shaft.
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1970 GMC 1500 Custom Original 350/TH350 Victoria, BC, Canada You can wish in one hand and crap in the other. See which one gets filled first. Last edited by Southpa; 12-02-2003 at 07:02 AM. |
12-02-2003, 10:50 AM | #9 |
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Join Date: Nov 2003
Location: Spring,Texas
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I just did my 68 and used every thing from 85 including swaybar ps and draglink,tie rod ends with no trouble.
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68? It's all figured out untill you get it apart. Is it Sunday yet??? 68 Project 68 SWB frame off/98 Vortec with stock FI/power everything. 95 ECLB 2500 with 346,000 on the clock(the original HD) 99 Lesabre-wifes ride 08 Crew Cab LTZ-All Mine 89 SWB 5/7 drop-Son's first ride. |
12-02-2003, 11:08 AM | #10 |
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Join Date: Oct 2003
Location: San Francisco Bay Area
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I even pulled the crossmember out of the front disc brake donor so that I maintained the correct brake line holders for the discs (my drum brake lines went around the front of the crossmember and the disc lines went around the back)
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12-03-2003, 08:07 AM | #11 |
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Thanks guys!
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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