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  1. Craig 85

    Advice on Muffler Replacement

    I don't like the rap sound of straight through mufflers. I'm debating about going with a pair of 50 series stacked vertical to replace the dual in/out in my 8.1L Suburban 2500.
  2. Craig 85

    Master Cylinder Size

    Your truck is a little newer than the trucks I did 3/4 ton axle swaps on. I had a '77 K5 and a '79 K15. I used my existing 1/2 ton power brake booster on both trucks. For the M/C I used the 3/4 ton version for the corresponding year. The 1/2 and 3/4 M/C were both metal and had the ports...
  3. Craig 85

    tire fitment??

    Here's a picture of my old truck and no I didn't put the Pete emblem on it (Lol). This lift and tire/wheel combo was probably done in the early 80's. 4" lift with 33x12.50's and 15x10 wheels. If the front fenders weren't trimmed they would have rubbed under flex. I'd be worried you may rub...
  4. Craig 85

    Keyed the same ignition switches

    Most older GM cars have this key coding. The square ignition key usually has one type of code and the round door key will have another. The codes changed every year. See the link for the breakdown. Back in the day we had 1989 Caprice patrol cars. The ignition and doors were keyed using a...
  5. Craig 85

    Correct bumper for '78

    Nope, found those on the internet. Blue is my favorite color. This is my current square.
  6. Craig 85

    Gear ratio advice 14 bolt BBC

    My current K30 has 3.73s. My last truck had 4.10s. Both had 32.8" tall 33's and automatics. The 3.73 is running around 2500 RPM at 65 MPH and the 4.10 was closer to 3000 RPM. It depends on your use. If you are running a stock size tires 30-31 inches with the manual you may be okay with a...
  7. Craig 85

    Brake Issues - RPO codes

    This came up a while back on a different thread, but up until about a year or two ago I didn't realize GM made a light duty 3/4 ton in a Square body. I was aware of them in the early GMT-400s. This picture is from my 1985 sales brochure. The first K20 listing has a lower GVW and probably the...
  8. Craig 85

    16 mile (Sixteen mile) Time Capsule

    I don't know if there is a way, but if the admin could attach all those photos somewhere here it would be a great reference.
  9. Craig 85

    Correct bumper for '78

    I hadn't even thought about the 67-72 fleetside. I had Square on my mind. You can see here the step side has the same profile, but the ends are curved. The 67-72 is flat on the ends.
  10. Craig 85

    Door Panels

    I put 81-87 door panels on my '79. You will have to change the door handles and arm rests. The door sweep might be different, too.
  11. Craig 85

    Correct bumper for '78

    B is a step side rear bumper.
  12. Craig 85

    California Square Body fans - Proposal to extend smog exemption model years

    Another problem we run into here is even if you have a Federal emissions vehicle, you have to prove it. If you don't have the original emissions tag or proof it originated as a Fed vehicle, you have to meet the California requirements for emissions equipment. The other thing our "great" state...
  13. Craig 85

    Preformed hoses

    I had an issue with my '85 K30. I couldn't find a replacement. As you can see from the pictures there are multiple bends. I ended up using a part from Eckler's Corvette GM 3994298; Eckler’s 6271610 - 1970-81 Corvette Formed “S” Hose (Frame Fuel Line to Fuel Pump) Photo #2. To get the...
  14. Craig 85

    Stock rim width

    To be honest I don't know. On the Land Cruiser pictures I found with these wheels they look hub centric. I don't know the hub size though. For what its worth, I've owned 8 Square body trucks and at least a half dozen or more other GM trucks (3/4 and 1 ton) all with aftermarket aluminum...
  15. Craig 85

    Use "Choke" light as MIL/CEL in LS swap?

    I had an '87 C30 years ago and recall it having a Service Engine Soon filter in the gauge cluster. You could maybe replace the Choke filter with the one shown below. The other thing you could do is find a pigtail like in photo #2 to illuminate the light. It is used to illuminate 4WD. That...
  16. Craig 85

    R20 Stock Ride Height?

    One issue I had with my '88 C20 Suburban (454) was the R/R spring had sagged causing it to crab walk. I know the PO had used it to tow his race boat before I got it. My spring on the right was 1/2" longer than the left.
  17. Craig 85

    Stock rim width

    Summit Racing has a at least a half dozen wheels. I don't know the hub diameter you need but it will narrow it down. Wheel Vintiques has a steel smoothie wheel in a 6 on 5.5", 16x8, 4" BS, 4.25" bore. Their page shows $115 a wheel. The second picture is a 16x8 with a 285/75R16...
  18. Craig 85

    School me on accessory fuse boxes

    I found this 4 circuit marine distribution box on Amazon (left side of first picture). When I got my truck only one of the two batteries were installed. I have my bed lights, aux back up lights and stereo going through the second battery.
  19. Craig 85

    Axle Identification

    Interesting. My '88 C20 Suburban had a 454 with 4.10's and it ran like a scalded ape! I've had 4 other Suburbans with 454's or an 8.1L with 4.10's and they really tow better than my current '01 Suburban 2500 8.1L with 3.73's. Mileage sucks, but they are more responsive than the 3.73's. I...
  20. Craig 85

    New "Old" Daily - 8.1L

  21. Craig 85

    New "Old" Daily - 8.1L

    Busy week doing repairs. I knew the R/F hub bearing was on it's way out. I was getting that lovely clicking noise on turns. Funny thing is I helped my buddy change that same one out about 6-7 years ago when he had the truck. I wish I knew what brand he used because it only lasted 40k miles...
  22. Craig 85

    Axle Identification

    I've never seen a 3.21 gear in a 3/4 ton Suburban, especially with a 454. I thought the highest gear (not numerically) was a 3.73? Look for GT4 = 3.73 or GT5 = 4.10 on the RPO codes. G80 is a Limited slip.
  23. Craig 85

    FNG saying hi

    :welcome:
  24. Craig 85

    Need interior pics

    I found this link to someone that did a restoration. Not totally stock, but it may help. Second link is for a truck that sold, but has some good interior photos. http://www.1990suburban.com/gallery/carpet/index.cfm...
  25. Craig 85

    Vintage Air: Weekend Install?

    I would loop the heater hoses for now and tackle the cab install first.

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