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  1. 1987 GMC Jimmy

    Camper Special

    So is anyone watching the “Packers” vs. the “Washington Native Indigenous Peoples of Color who don’t necessarily have to conform to binary gender norms if they don’t want to” game Sunday? Comes on at noon central IIRC.
  2. 1987 GMC Jimmy

    Carb info/comments

    Yep. Does it have the vacuum diagram on it still? If so, follow it. If not, get the emissions diagram for a 49 state truck or van 305. If you have a TH350C, it’ll include the vacuum routing for the trans modulator. If a 700R4 or a manual, you don’t have to worry about that part. Be sure not to...
  3. 1987 GMC Jimmy

    Slow and labored power windows

    Check your grounds, check your battery resting voltage, and check your alternator output at the alternator and at the battery if this issue is happening with the vehicle running. If you’re missing a ground or one’s making poor contact, this can happen. You can also lubricate the run channels...
  4. 1987 GMC Jimmy

    Metal Treasures in the Oil Pan...

    Haha, I guess you’re truck is singing “yo ho ho and a bottle of rum.” I’ll be singing the same thing in the not too distant future. Anyway, apologies for your troubles, and welcome aboard.
  5. 1987 GMC Jimmy

    Brakes a Mess

    @Vbb199 might be able to save you on that one from a parts standpoint.
  6. 1987 GMC Jimmy

    Brakes a Mess

    No, I’m afraid not. I almost did because I knocked the weights off one of them, but I got some weights off a five lug drum and repaired (or at least tried) it to avoid getting a new one if possible when the old one was still in good shape inside.
  7. 1987 GMC Jimmy

    Brakes a Mess

    I repaired my drum, got the links, and springs that had broken off from a junk C10, and put it back together somewhat, but something’s wrong. At least I think it is, or I don’t know as much about drum brakes as I thought. The issue is with the bar. The front shoe isn’t making full contact with...
  8. 1987 GMC Jimmy

    Help

    If it has an NP203, it’s already full-time unless someone converted it with a part-time kit. Conventional for our is mostly part-time, but that’s not universal since there are a good many NP203s out there. Anyway, the problem that concerns me is the gasket being crunched into that little box...
  9. 1987 GMC Jimmy

    rear wheel antilock (RWAL) system - ditch it?

    Was the vacuum line there on the one in question? If so, and you don’t have plans for it, the switch can go if you so desire.
  10. 1987 GMC Jimmy

    Anyone know how to change the radio light bulb?

    I’m offensive, and I find this joke Polish.
  11. 1987 GMC Jimmy

    Stock replacement shocks

    I’ve almost always used Monroe with good results. The only exception is I used Gabriel for my steering stabilizer because it was viscous (oil-filled) instead of gas charged, which I didn’t want to install it and have to fight a stronger tendency for the thing to want to decompress and pull to...
  12. 1987 GMC Jimmy

    Speedometer wire question

    That’s the VSS buffer wire. It’s a Hall effect sensor so it ‘sees’ the rotation of the speedo to figure out your speed and send that info to the cruise control and, in your case, the ECM, as well.
  13. 1987 GMC Jimmy

    WTB: Brake Hardware

    I’ve got a six lug Corp. 10 Bolt and 11” brakes. I need at least one wheel cylinder - brake shoe link, but if you have any extras I’ll take up to four. If anyone’s got a spare drum that’s got some life to it before I have to go hunt down a new one, I’d take that. Or even two of the weights that...
  14. 1987 GMC Jimmy

    Opinion on "high mileage"

    That’s amazing! Good for GM in 1999. I don’t know where they were on giving up on passenger cars at that point, frankly I assumed they had by that point, but I guess they still turned out a few that worked well. Hell, even for the consistently awful carmakers, a broken clock is right twice a...
  15. 1987 GMC Jimmy

    Question about backfire on throttle release

    I’m talking about detonation or pre-ignition. It’s hard to describe, almost like a tinny, crunchy sound. If it’s not doing it at idle or under load/acceleration, you’re in good shape, and I’d press for the highest number possible. 350s seem to be universally safe at 12*. Some can handle more, a...
  16. 1987 GMC Jimmy

    Brakes a Mess

    The good news is that it’s just one: the rear DS brake. The bad news is I hate drum brakes. I knew because it was pulling to the right when braking even though the front have already been done, and are in perfect shape. I pulled this drum and found... One wheel cylinder link missing and the...
  17. 1987 GMC Jimmy

    Question about backfire on throttle release

    Did it ping with more timing than that? If not, it take it all the way to 12* base and see if you can recover some of what it lost.
  18. 1987 GMC Jimmy

    Question about backfire on throttle release

    I’d start with 6* BTDC base, and if it’s better, see what 10-12* BTDC does for you.
  19. 1987 GMC Jimmy

    Alaska; 86’ 4x4

    Okay, so that other TVS could be for that. It’s not supposed to lock up until you’re at operating temp so there definitely needs to be a thermal control somewhere. It’ll derive vacuum from the carb and go to the TVS and then the switch. There’s also supposed to be a delay valve in the vacuum...
  20. 1987 GMC Jimmy

    Question about backfire on throttle release

    Maybe the float level’s a little too high or the idle mixture is way too rich. It sounds like that’d be the direction you adjusted it, and then there’s another issue going on that richening up helped to mitigate. I’d keep this in mind, and my next concern is definitely timing. It wouldn’t...
  21. 1987 GMC Jimmy

    rear wheel antilock (RWAL) system - ditch it?

    One’s for the brake lights and TCC lockup disengage. The one for the cruise should have a vacuum line going to it from the servo. It interrupts vacuum to release the servo. If the RWAL system interfaces with a switch, it’ll be the actual stoplamp switch. I don’t think GM ever really got RWALB...
  22. 1987 GMC Jimmy

    I had a sort of crazy Idea last night . . .

    @shiftpro
  23. 1987 GMC Jimmy

    14 bolt 10.5 rebuild questions

    I went with Motive Gear, and the rear end shop who did mine said that was a good brand. Their emphasis was on using quality oil, a good limited slip additive, and playing by the rules during the break in period. This means stopping and letting it cool and not driving more than 55 during the...
  24. 1987 GMC Jimmy

    Todds 84 k10

    Welcome. You’re really close to me, less than two hours, which for here is close. That’s the cruise control release switch for when you press the brakes. If you want cruise, you definitely need that leak fixed. If not, then no.
  25. 1987 GMC Jimmy

    Alaska; 86’ 4x4

    Is the truck a California emissions truck or a Canada truck? Does an orange SES light or a red Choke light come on when you first turn the key? The reason I ask is if it was a California truck, the ECM controls your TCC lockup. If not, the vacuum switch is supposed to be on the firewall. What...

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