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71 Dart SBP>BBP conversion (front) .. I forget!!! #1522533 10/24/13 03:50 AM 10/24/13 03:50 AM
Joined: Aug 2003 Posts: 12,589 Sacramento, CA cal_gecko OP I Live Here
cal_gecko OP I Live Here Joined: Aug 2003 Posts: 12,589 Sacramento, CA	So it's been almost 10 years since I changed the front end of my 71 Swinger from the SBP disc brake setup to BBP discs .. for the life of me, I can't remember what was involved - I think I got the brakes and spindles from a 73 or 74 A-Body, but not 100% sure.. I did whatever the "normal" conversion is.. what else does the conversion entail? Since I'm going to have the entire front suspension rebuilt with new bushings and stuff - do I need to get different components for different year vehicles for things like the UCA's/LCA's - ball joints, etc? I don't remember if the UCA's/LCA's had to be swapped as well as the spindles... ? Wish I had done a better job documenting what I did!!

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: cal_gecko] #1522534 10/24/13 04:37 AM 10/24/13 04:37 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	From 1973 to 1975, the A body disc brakes were the same from the ball joints to the calipers. Sometime in 1976, they changed to a different caliper with a larger bore size. the 73-75 has 2.6" calipers, the 1976 models used a 2.75 size. The larger bore size provides more stopping power with the same pedal effort. I have these 2.75 calipers on the Charger. I also have a stock type 1975 Dart master cylinder and brake booster. I always remove the thin metal splash shields when I work on these setups. They retain heat. I don't need them for protection from the elements because I don't drive my cars on gravel roads.

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: cal_gecko] #1522535 10/24/13 10:42 AM 10/24/13 10:42 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You'd need the disc spindle of course & everything outward on it (rotor/horseshoe adapters/calipers/bearings/bolts). The LCA is the same & need the 73-76 UCA's or I believe someone sells a tapered spacer so you can reuse the early UCA since the disc spindle upper hole is larger (since the later ball joint dia/taper is larger) & needs a sleeve to take up that space. As Franken said use 76 A body calipers (2.75" bore) (remans are pretty reliable/cheap). The spindles are mirror images of each other & interchange from side to side & I'd mount em so the brake hard line/hose frame mounting tab is on the opposite side (front to rear) as the caliper unless sway bars make you mount em on the back side. In other words if the frame tab is rearward/behind the spindle then mount the calipers to the front side & vice versa & if you need a longer hose use one from a 78 volare & cut off HALF of the metal bracket clamped on the middle of the hose. live every 24 hour block of time like it's your last day on earth

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: RapidRobert] #1522536 10/24/13 11:54 AM 10/24/13 11:54 AM
Joined: Aug 2003 Posts: 12,589 Sacramento, CA cal_gecko OP I Live Here
cal_gecko OP I Live Here Joined: Aug 2003 Posts: 12,589 Sacramento, CA	Thanks guys.. so it's safe to say that when I upgraded the brakes, I also upgraded the UCA's in addition to the spindles and brakes... so this means that when I order the suspension bushings and stuff, I'll make sure I order bushings for the 73 Dart UCA's, and everything else for the 71 Dart

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: cal_gecko] #1522537 10/24/13 12:00 PM 10/24/13 12:00 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Highly likely that later UCA's were used instead of the earlier ones with the spacers so actually the only later (73 up) pieces (2) you need for the rebuild would be (73 up) upper ball joints, 1 on each side & (2) (73 up) disc lower ball joints. live every 24 hour block of time like it's your last day on earth

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: RapidRobert] #1522538 10/24/13 12:30 PM 10/24/13 12:30 PM
Joined: Aug 2003 Posts: 12,589 Sacramento, CA cal_gecko OP I Live Here
cal_gecko OP I Live Here Joined: Aug 2003 Posts: 12,589 Sacramento, CA	Quote: Highly likely that later UCA's were used instead of the earlier ones with the spacers so actually the only later (73 up) pieces (2) you need for the rebuild would be (73 up) upper ball joints, 1 on each side & (2) (73 up) disc lower ball joints. And 73 up UCA bushings too, right?

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: cal_gecko] #1522539 10/24/13 12:45 PM 10/24/13 12:45 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I am almost positive that the 4 small UCA bushings (2 per side) are the same (early/late) since I think the Moog offset bushings for that are the same for early/later live every 24 hour block of time like it's your last day on earth

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: RapidRobert] #1522540 10/24/13 01:02 PM 10/24/13 01:02 PM
Joined: Aug 2003 Posts: 12,589 Sacramento, CA cal_gecko OP I Live Here
cal_gecko OP I Live Here Joined: Aug 2003 Posts: 12,589 Sacramento, CA	Quote: I am almost positive that the 4 small UCA bushings (2 per side) are the same (early/late) since I think the Moog offset bushings for that are the same for early/later Thanks .. I'll check the part numbers.

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: cal_gecko] #1522541 10/24/13 02:26 PM 10/24/13 02:26 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Buy parts for a 73-76 a body. LBJ, UBJ, UCA bushings are the same from 67-76 http://www.bigblockdart.com/techpages/moognumbers.shtml

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: RapidRobert] #1522542 10/24/13 02:37 PM 10/24/13 02:37 PM
Joined: Dec 2003 Posts: 16,844 Phoenix - surface of the sun nomore65BelvJim I Live Here
nomore65BelvJim I Live Here Joined: Dec 2003 Posts: 16,844 Phoenix - surface of the sun	Quote: Highly likely that later UCA's were used instead of the earlier ones with the spacers so actually the only later (73 up) pieces (2) you need for the rebuild would be (73 up) upper ball joints, 1 on each side & (2) (73 up) disc lower ball joints. disc and drum lower ball joints are the same 73-76.

Re: 71 Dart SBP>BBP conversion (front) .. I forget!!! [Re: nomore65BelvJim] #1522543 10/24/13 09:52 PM 10/24/13 09:52 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Quote: Highly likely that later UCA's were used instead of the earlier ones with the spacers so actually the only later (73 up) pieces (2) you need for the rebuild would be (73 up) upper ball joints, 1 on each side & (2) (73 up) disc lower ball joints. disc and drum lower ball joints are the same 73-76. Oh OK, thank you live every 24 hour block of time like it's your last day on earth

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