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Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728478 October 03rd 2017 4:37 pm
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old hand
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I can put you in contact with the guy who has done this, the guy I saw at Mooneyes. He drives his van all the time here in So Cal and can probably go through all of the issues he came upon and how he dealth with them. He did this in his driveway at his house, not some fancy shop. I spoke to him at length on the phone.


1987 B250 - Painkiller
Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728486 October 03rd 2017 9:08 pm
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I wrote the first paragraph, what i meant was c truck 73-87 5 lug lift spindles will work (if you can find them). The late model spindle will work, but you must use the same rotors, bearings and brakes for that spindle. A few older c truck owners have done this you can look it up on line. You can use the upper ball joint for the late spindles as the bolt pattern is the same (classic GM), the lower BJ I believe is the 30. I have both arms at this point to compare and not have had the chance. It's all about the BJ taper. One person complained about the tie rods hitting the sway bar, he put the tie rods in from the top of the steering arm on the spindle, but beware study bump steer.

Re: 2WD 4" lift 1990 G20 sportvan project
Death or victory #728522 October 04th 2017 3:09 pm
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That would be great. DM me his contact details.

Re: 2WD 4" lift 1990 G20 sportvan project
jcd74 #728523 October 04th 2017 3:17 pm
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Originally Posted by jcd74
I wrote the first paragraph, what i meant was c truck 73-87 5 lug lift spindles will work (if you can find them). The late model spindle will work, but you must use the same rotors, bearings and brakes for that spindle. A few older c truck owners have done this you can look it up on line. You can use the upper ball joint for the late spindles as the bolt pattern is the same (classic GM), the lower BJ I believe is the 30. I have both arms at this point to compare and not have had the chance. It's all about the BJ taper. One person complained about the tie rods hitting the sway bar, he put the tie rods in from the top of the steering arm on the spindle, but beware study bump steer.


73-87 spindles was never mentioned only 88-91.

Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728524 October 04th 2017 3:27 pm
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Cutting and welding in the g30 ball joint flange in to the g20 arm took about 1 hr to do. I would not recommend doing this unless you're a professional fabricator.

So now my setup is stock G20 control arms top and bottom with ball joints to match a 88-91 lift C1500 spindle.

If I have to buy C1500 new brake rotors to fit the spindle that's fine. If I need brakes to fit the C1500 spindles I'll just grab a set from Pick N pull and rebuild them.

My only unknown is the tie rod ends. I'll update tonight.

As for the rear lift. 4" lift blocks are easy enough. At that length extending the break lines will need to be done as they are tight when the suspension is fully extended.

Also pinyon angles need to be adjusted with shims.

The drive shaft is just long enough but mine needs a balance so I'm going to extend it 1-1.5 inches just to know it's right.

I have the back wheels on and 35" tires clear fine with th a 4" lift and it look pretty rad so I'm looking forward to doing the front.




Attached Files
IMG_1032.PNG (4.11 MB, 263 downloads)
Last edited by Metal; October 04th 2017 3:40 pm.
Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728539 October 04th 2017 8:28 pm
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Ok so G30 lower ball joints don't fit the 88-91 C1500 spindles. They go in but are not long enough to get the castle but seated. So I'm going to the parts store tomorrow to see how much longer the C1500 lower ball joint is. I had them side by side two days ago but didn't notice the difference. I'll have to swap them out.

Off to Pick N Pull to get the C1500 brakes, baking plates, and break hose.

I'm going to need a much longer beak hose up front to get the brake close to being mounted on the spindle.

The biggest thing I notice is the spindle off set is about 2.5 inches wider than stock. So I would offset in the back rims to match if I was going to do this again. As it is I'll get a spacer plate and longer studs and call it good.

I'll update more tomorrow.

Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728541 October 04th 2017 9:19 pm
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Here's some images to go with my points made in the last few posts.

Attached Files IMG_1053.PNGIMG_1052.PNG
IMG_1050.PNG (3.91 MB, 333 downloads)
IMG_1049.PNG (3.38 MB, 264 downloads)
IMG_1048.PNG (3.78 MB, 245 downloads)
IMG_1047.PNG (3.12 MB, 288 downloads)
IMG_1046.PNG (3.52 MB, 263 downloads)
IMG_1045.PNG (3.45 MB, 282 downloads)
IMG_1044.PNG (3.15 MB, 255 downloads)
IMG_1057.PNG
Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728616 October 07th 2017 1:54 am
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Well I got it all together today. Of course just when I think it's all done I realize I also need lug nuts to fit the C1500 hubs.
The final parts list

G20 van stock
G20 lower control arm with G30 ball joint flange welded in.
G20 upper control arm

88-91 C1500 parts
standard cab spindles 4" lift
Outer tie rods ends
Brake calipers
Spindle bearing
Crown nut, lock washer and pin kit M20 x 1.25
Lower and upper ball joints

Custom Parts
40" Custom brake lines front
25" custom brake line rear
9/16 x 11.5 x 3.25 round radius u bolts
4" cast iron lift blocks ( will need shims to align caster )
Ion 15" x 10" wheels
35" x 12.5" x 15" tires
Shocks for a ram charger late 70's, 4" over stock from the G20 rear shocks.

M14 x 1.5 lug nuts

This set up will work for all G series. G30 no need to modify the bottom control arm.

Re: 2WD 4" lift 1990 G20 sportvan project
Metal #728898 October 13th 2017 4:33 pm
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So a four inch lift is not enough height to clear 35" tires. They rub when turning.

I don't really want to go any higher so I'm going to trim the bottom corner of my wheel arch to clear.

So I guess keep this in mind if you want to run 35's.

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