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Old 01-07-2003, 02:40 PM   #26
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dream68 can you elaborate on the 88 truck you got the parts off of. Was it a 1/2 ton or 6 lug 3/4 ton? I have Hollanders on my laptop and would be able to post some info for folks. Hollanders does show the 67-70 vs 71-87 3/4 ton lower control arms being different. Which did you use? I have heard you could use the 88-91 3/4 ton 2wd 6-lug rotors on 71-up spindles using 71-up calipers. I went to Autozone and had them pull a 71 1/2 ton 5-lug rotor and a 88 3/4 ton six lug rotor and they were basically the same and appeared to use the same bearing.
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Old 01-07-2003, 03:24 PM   #27
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JJR: it was a 88 1/2 ton chev 2wd that all these parts came from. everything was ripped off the same truck, even the gearbox, but the gearbox will not fit...
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Old 01-07-2003, 04:42 PM   #28
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Hollanders shows two spindles used on an 88 c1500 2wd. One for a 1" rotor and one for a 1 1/4" rotor. The spindle for the 1" rotor came on 88-91 c1500 and had a 1 1/4" inner bearing surface diameter. The spindle for the 1 1/4" rotor(which is probably what you have) came on the following:
CHEVROLET PICKUP TRUCK 88 2500 Series; 4x2
CHEVROLET PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor
CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel
CHEVROLET PICKUP TRUCK 92-98 1500 Series; 4x2
CHEVROLET PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel
CHEVROLET PICKUP TRUCK 99 1500 Series; exc. Silverado; 4x2
CHEVROLET VAN 96-99 1500 Series
CHEVROLET VAN 96-99 2500 Series; 7300 lb. GVW
GMC PICKUP TRUCK 88 2500 Series; VIN models "C/K", 4x2
GMC PICKUP TRUCK 88-91 1500 Series; 4x2, 1-1/4" thick rotor
GMC PICKUP TRUCK 89-91 2500 Series; VIN models "C/K", 4x2, 6 bolt wheel
GMC PICKUP TRUCK 92-98 1500 Series; 4x2
GMC PICKUP TRUCK 92-98 2500 Series; 4x2, 6 bolt wheel
GMC PICKUP TRUCK 99 1500 Series; old style (flat, pull-up outside door handle), 4x2
GMC VAN 96-99 1500 Series
GMC VAN 96-99 2500 Series; 7300 lb. GVW
SUBURBAN 92 1500 Series; 4x2
SUBURBAN 93-96 1500 Series; 4x2, vacuum brake booster
SUBURBAN 97-99 1500 Series; 4x2, gas
TAHOE/YUKON 95-99 4x2

'95 up have ABS sensors on the brake shield.
1-3/8" inner bearing surface dia.
Inner bearing consists of #LM48548 cone & #LM48510 cup.
Heavy duty chassis option code is F44..

15981299 R.
15981298 L.


For lower control arm: the 67-70 3/4 lower arm can come from the following:
CHEVROLET FORWARD CONTROL 68-70 20 Series
CHEVROLET FORWARD CONTROL 68-70 30 Series; 7200 lb. rear axle
CHEVROLET PICKUP TRUCK 67-70 20 Series
CHEVROLET PICKUP TRUCK 67-70 30 Series; 7200 lb. rear axle
CHEVROLET VAN 71 30 Series; drum brake
GMC FORWARD CONTROL 68-70 2500 Series
GMC FORWARD CONTROL 68-70 3500 Series; 7200 lb. rear axle
GMC PICKUP TRUCK 67-70 2500 Series
GMC PICKUP TRUCK 67-70 3500 Series; 7200 lb. rear axle
GMC VAN 71 3500 Series; drum brake
SUBURBAN 67-70 20 Series
SUBURBAN 67-70 2500 Series


If the 71-up 3/4 ton lower control arm can work they can come from the following:
CHEVROLET FORWARD CONTROL 71-72 30 Series; 7200 lb. rear axle
CHEVROLET FORWARD CONTROL 71-89 20 Series
CHEVROLET FORWARD CONTROL 73-78 30 Series; non-removable carrier
CHEVROLET FORWARD CONTROL 79-84 30 Series; drum rear brakes, sgl. rear wheels
CHEVROLET FORWARD CONTROL 85-92 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels
CHEVROLET FORWARD CONTROL 93 30 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes
CHEVROLET PICKUP TRUCK 71-72 30 Series; 7200 lb. rear axle
CHEVROLET PICKUP TRUCK 71-88 20 Series
CHEVROLET PICKUP TRUCK 73-80 30 Series
CHEVROLET PICKUP TRUCK 81-88 30 Series; std. duty susp.
CHEVROLET PICKUP TRUCK 89-91 2500 Series; VIN models "R/V"
CHEVROLET PICKUP TRUCK 89-91 3500 Series; VIN models "R/V", std. duty susp.
CHEVROLET VAN 72-78 30 Series
GMC FORWARD CONTROL 71-72 3500 Series; 7200 lb. rear axle
GMC FORWARD CONTROL 71-89 2500 Series
GMC FORWARD CONTROL 73-78 3500 Series; non-removable carrier
GMC FORWARD CONTROL 79-84 3500 Series; drum rear brakes, sgl. rear wheels
GMC FORWARD CONTROL 85-92 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels
GMC FORWARD CONTROL 93 3500 Series; exc. hvy. duty front susp.; drum rear brakes, sgl. rear wheels, w/o 9L6 brakes
GMC PICKUP TRUCK 71-72 3500 Series; 7200 lb. rear axle
GMC PICKUP TRUCK 71-87 2500 Series
GMC PICKUP TRUCK 73-80 3500 Series
GMC PICKUP TRUCK 81-87 3500 Series; std. duty susp.
GMC PICKUP TRUCK 88-91 3500 Series; VIN models "R/V", std. duty susp.
GMC VAN 72-78 3500 Series
SUBURBAN 71-88 20 Series
SUBURBAN 71-91 2500 Series

This statement makes for some confusion: This arm (71-up) may have two different ball joints one being light duty, the other being heavy duty. I am assumming they would be different diameters.

I hope this info helps.
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Old 01-08-2003, 01:48 AM   #29
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JJR,the info given to me on the 3/4 tons(from local napa) is the ball joints interchange from 71-86 or 87 on the pickups. I didnt see his book, so it was just info given to me. I do know from experience that the 71 3/4 ton lower ball joint will press into the 67-70 3/4 ton lower arms, but the steer stops are different on the older arms(same deal as the 1/2 tons, it will shorten the turning radius), & will require a little grinding on the stops on the spindles to straighten it up.......crazyL
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Old 01-08-2003, 08:23 AM   #30
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That is good to know Crazy Longhorn. The local pull-a-part tends to have a good selection of 3/4 ton trucks and occationally an 88-up. The get $15 for control arms and spindles. I have also seen several sets of 88-up spindles on e-bay go dirt cheap. People put drop spindles on and basically give away the old ones. Since a already have a set of 71 1/2 ton control arms and spindles and new ball joints for them, I will probably end up buying a set of 6-lug rotors and use what I have.
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Old 01-08-2003, 04:22 PM   #31
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OK GUYS: the steering linkage is a tad sloppy in the spindle, so this is what you do. use the 68 intermediate shaft with the 88 tie rods. the inside tie rod end is changed to PART# : MOOG ES2020RL.(tie rod end). This setup fits and looks like a dream with no binding anywhere. the 88 tie rods are also bulkier than the 68 original setup..... I will be in touch with more updates as i go... KEEP ON TRUCKIN MAMA!!!!
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Old 01-08-2003, 05:04 PM   #32
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ALL PARTS NEEDED FOR BRAKE CONVERSION ON 68:::1968 1/2 ton top a-arm, 1970 3/4 ton bottom a-arm, 1988 1/2 ton ball joints(both), 1988 1/2 ton spindles, calipers, and rotors, 1968 1/2 ton intermediate shaft, 1988 1/2 ton tie rods, with the inner tie rod end changed to part#: MOOG ES2020. Brake lines can be changed if need be!!! GET TO WORK!!!
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Old 01-08-2003, 05:25 PM   #33
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This is great info...but...anyone know if this will work for a 70
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Old 01-08-2003, 05:49 PM   #34
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wnc mountain: i believe it should work because the boneyard told me the a-arms were the same from 68-70.
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Old 05-18-2003, 06:28 PM   #35
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72 to 68 front brake swap

New to the group and just saw your conversion. Tell me, i've got a streetable 72 donor truck. Can the front brakes be easily swapped in to a 68? Both are nonpower.
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Old 05-27-2003, 11:37 AM   #36
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Brake swap to earlier years

I've followed this conversation with the understanding that this brake swap would apply for the 60-66. Can you offer your knowledge about this same swap applying to these year Chevys/GMCs?
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Old 05-28-2003, 11:37 AM   #37
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Application to 60-66 models

Will this conversion apply to the 60-66 model Chevys and GMCs. I have a '63 GMC 6 lug that desperately needs more stopping power.
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Old 11-17-2003, 01:43 PM   #38
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Has anyone else tried this conversion? It seems like a cheap way to add modern brakes to an old truck but I would like to hear from others that have tried it.
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Old 01-01-2004, 01:57 PM   #39
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Now where to find a set of 3/4 ton lower control arms cheap?
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Old 04-03-2004, 10:48 AM   #40
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Have you had it on the road yet...?

Was wondering if you felt any difference in the way it handled with the change..?
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Old 01-30-2005, 12:04 AM   #41
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will the 73-87 stuff work? i've got a 86 frame im gonna be scrapping here in a couple weeks.
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Old 01-30-2005, 12:25 AM   #42
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You can just put the front crossmember off the 86 on your frame. A search on disc brakes should give you a lot of info on this subject.
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Old 01-30-2005, 12:38 AM   #43
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i already have discs on my truck...was wondering if it was any use to anyone else.
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Old 01-30-2005, 03:58 PM   #44
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the 73-87 stuff will not work for this style conversion unless you someone wanted to buy the aftermarket 6 lug rotors...
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Old 01-30-2005, 05:05 PM   #45
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the 73-87 stuff has 5 lug.
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Old 01-30-2005, 06:52 PM   #46
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Exactly. Not to mention it is a TOTALLY different swap. Parts used to do the swap are different.
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Old 04-02-2005, 02:21 PM   #47
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yes, it looks like this... been running it for a while now so it doesn't look as nice but you get the idea. I used a 1990 chevy front end/parts that had 5 lug 1.25" thick rotors and went to AutoZone and bought new factory 6 lug 1.25" thick rotors and bolted them on.
Good luck.
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Old 04-05-2005, 06:50 PM   #48
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This is probably going to make a lot of disc brake conversion vendors mad .

Expect prices to go up on 3/4 ton lower a-arms and the 88 parts, or they will probably package your idea and still sell it for $700-$1000.
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Old 04-05-2005, 09:03 PM   #49
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All in all, it's really not that cheap. I spent around $400 and I only bought what I had to plus two new rotors. You could easily spend $600 plus if you were buying all new bearings and rebuilding the calipers etc...

The only reason I did this swap was because I wanted to use all parts available at my local AutoZone, O-Riely's, etc. and not have to order special rotors from some company that could go out of business in 5 years.
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Old 04-05-2005, 10:49 PM   #50
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Hey, FirstGen....

Can you provide any more detail about what exactly parts were necessary for your truck and what you got them off of? I've heard stories of people raiding 1994-1996 Impala/Caprice/Roadsters to get the 5-lug setup.

I am wondering if there is a need to get new a-arms (upper or lower), ball joints, tie rods or intermediate shaft with the method you chose?

I literally have the same truck as you (closer to stock though ) - I would probably do mine a bit different, just looking for some direction.

TIA
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