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  1. Pinger

    Brake problem...

    Got a brake problem with my 1999 Suburban - 5.7l with HydroBoost - that knowing a couple of things might help me get to grips with. Firstly, the more forward, smaller, part of the reservoir is for the rear brake circuit - yes? What causes the light on the dash to illuminate and, how does the...
  2. Pinger

    Frame resonance.

    This has been discussed before (the resonance/vibration from the middle of a GMT400 frame) though I can't remember the proper name for it. My C2500 Suburban had it mild at around 60-65mph - but it's got much worse and now occurs at 70mph - a useful cruise speed. What has changed is that I...
  3. Pinger

    HVAC control weirdness...

    Two things on my 1999 Suburban I can't figure out. The linkage that controls the face level door seems to be jamming up the operation of that actuator. For a while the face level vents wouldn't work. When I pulled at the arm on the door it freed - but the linkage came apart (at the spring)...
  4. Pinger

    Tyre pressures and wear.

    Rotated my tyres (as per the handbook) today - a first for me. The reason I did was because the rears have worn more than the fronts and as mine is a RWD 2500 Suburban and winter is approaching, an extra mm on the driven axle could be the difference between getting off my driveway or slithering...
  5. Pinger

    Head bolt sealant.

    A couple of guys on a UK (LPG/propane) forum are rebuilding boat engines. One is a V6 Vortec, the other is 302 Ford. Both have head bolts that enter the water jacket. The question is 'what to use as a sealant?' On another thread I saw a Loctite product being mentioned. I know you guys reach for...
  6. Pinger

    O2 Sensor - disconnect?

    Prepping for a pending exhaust change and the O2 sensor in the (so called) resonator pipe will have to come out. By the look of it removal is only possible with the resonator removed but I can't see where to disconnect the wiring. O2 sensors I've dealt with previously had a 6'' pigtail but the...
  7. Pinger

    Downpipes to 'resonator' nuts?

    Another 'what size are my nuts?' thread. Exhaust replacement beckons but not until next week when it arrives. Truck is 1999 C2500 Suburban 5.7l and has dual cats that then join to twin pipes (resonator?) which lead to a single muffler (dual inlets, single outlet) which I believe is what it would...
  8. Pinger

    Flare nut detail for 1/4'' pipe - urgently needed.

    Replacing - or attempting to replace - rear section of 1/4'' brake pipe on my 1999 C2500 Suburban 5.7l with JD7 system. Intended re-using flare nuts (on home flared copper/nickel pipe) but one of them is going to end up destroyed in the removal process so need to source replacements. Inevitably...
  9. Pinger

    Fat brake pipe(s)

    I have to replace the section of brake pipe that meets the upstream side of the rear flexible hose on my 1999 C2500 Suburban 5.7. Is it 1/4'' pipe I need. (I'll have to make my own pipe here as the chances of getting a pipe off-the-shelf here in the UK or anyone to send me one from the USA are...
  10. Pinger

    Vortec valve seats?

    Do cast iron Vortec heads have pressed in valve seats or are the seats cut straight into the iron?
  11. Pinger

    Inline filters - HydroBoost and steering - photos.

    Some photos of where I installed filters in return lines for HydrBoost and steering. Filters are Edelmann 70-700 Power Steering Filter Universal Fitting. Both filters visible. HydroBoost filter. HydroBoost filter viewed through wheel well. Steering filter viewed through wheel well.
  12. Pinger

    G80 (9.5'') clutches.

    Starting a fresh thread here in the hope that mentioning (G80) might draw attention from those familiar with them. What precedes this can be seen here >> https://www.gmt400.com/threads/rear-wheel-bearing-99-suburban-c2500.58044/ - but there's no reason to read it. What I want/need to know is if...
  13. Pinger

    Jacking under diff question.

    Is it safe (for the integrity of the diff casing) to jack my C2500 Suburban (14 bolt casing) with a bottle jack under the periphery of where the cover attaches with the cover removed?
  14. Pinger

    Caliper seals - where do they go?

    Putting new rotors and pads on my C2500 (JB7) and when I opened the box of ads there's a bunch of seals I can't figure out. The large black ones are obvious and I think I can see the existing smaller black ones around the steel tube the caliper mount bolts pass through - but not how to remove...
  15. Pinger

    Rear wheel bearing? - 99 Suburban C2500

    Completely confused here! I've found axial play at the passenger side rear wheel but no rocking or roughness. Found this video >> It's for a 1500 - is my set up going to be the same? What I have is a C2500, 14 bolt casing, 8 lug wheels, 13'' drums and G80. Rock Auto identifies bearing...
  16. Pinger

    Adjusting JB7 Duo-Servo shoes

    I've read the GM manual as to how to - but have a few questions. 1999 C2500 Suburban with JB7, 8 lug, and 14 bolt axle - will it have 'knock outs' to permit adjustment without having to remove the drums? Does the adjuster move freely in both directions or, like other self-adjusters I've...
  17. Pinger

    Suburban mystery module in jack compartment?

    Anyone any idea what it is or what it's for? It's a small - circa 2'' x 2'' x 3/4'' - box stuck to the side in the front section of the jack compartment (just below the seatbelt reel) with a bunch of wires coming out (or in!) to it. What's it for?
  18. Pinger

    Camber pics for Dariusz

    Yep. Not measured but visible. See pics below. Compare camber to upright rear wheel in second pic.
  19. Pinger

    Struggling to access the forum.

    As per title. The forum home page loads but most sections when I try to access them just won't load. (I'm surprised I've got this far here). This has been the case for a few days. Is there any reason for this and/or has anyone else been struggling? Bear in mind I am in UK - if this has any...
  20. Pinger

    DRL - did all Suburbans have it?

    As per title, did all Suburbans have DRL as standard and if so, is it possible that it could have been optioned out on an export model?
  21. Pinger

    Headlamp switches - troublesome?

    As per title - are they known to go bad? Driving in rain yesterday with the dipped beams on I noticed the switch warm to the touch. Kinda odd as I recently did the 4Hi mod and used relays so the load on the switch should be much reduced. Heating was on (low temp) and through the demister and...
  22. Pinger

    MAF sensor / hard shift question.

    I found that my MAF sensor was without its fused 12V supply and when I put that right the hard up-shifts ceased to be a problem. What if, the MAF sensor didn't see air flow but was connected electrically. Would the PCM behave as though the MAF sensor was electrically disconnected and resort to...
  23. Pinger

    Reading lights - Suburban

    Middle row reading lights in my 99 Suburban aren't working but I can't see an obvious way to remove the cluster from the roof lining. How do I do that without making a mess of it?
  24. Pinger

    Throttle sensitive cold start 1999 Vortec 5.7

    Before I changed the inlet manifold gaskets it would cold start without throttle. Since then - despite winding the throttle stop screw in as far as it goes - it needs a touch of throttle pedal to cold start. This was acute yesterday and could have flattened the battery so starting to be a...
  25. Pinger

    Do 4L-80Es whine in first gear?

    Mine does - is that normal? Low mileage truck and recent full oil change (it whined before that anyway) and doesn't seem to be misbehaving in any way. Oil level is correct.

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