73-87chevytrucks.com

Welcome to 73-87chevytrucks.com

73-87chevytrucks.com is not only a forum we are also a vendor for a variety of parts both replacement and custom. Check out our store at 73-87chevytrucks.com Online Store

73-87chevytrucks Social Network

We are also on Facebook so give us a like to the page if you like what you see: http://www.facebook.com/7387chevytrucks

73-87chevytrucks Merchandise

SpreadShop Site

Cafepress Site

74 c10 hvac control

February 14, 2026, 04:52:36 pm by doneebaker | Views: 1043 | Comments: 6

Hello folks , new user here. I have a 74 c10 with a/c that I cant get the heater motor to do anything. It will run on slow mode when I turn on the key but nothing else. While poking around in there I see an orange wire hanging from the hvac vacuum switch on the right side of the controller just hanging there not connected to anything and I can't see any other wires hanging down it should be connected to. I assume that it needs power but we all know about assuming things. Every thing else is intact. So if anyone would know where that wire goes to or what it is connected to that would be a huge help. I tried to find diagrams online but no luck. Thanks in advance for any help..

Read More | Write Comment

Oil additives

January 29, 2026, 08:29:34 pm by JohnnyPopper
Views: 4575 | Comments: 8

I looked carefully at the categories and where to drop this PSA. This seems the most appropriate. If not, I'm sure it will be relocated by our crack team of mods.

50 years of serious wrenching, seen so many things come and go for various reasons.

Oil quality and additives have always interested me, as growing up poor, it made sense to pay attention to things that actually worked to keep the heart of your ride alive, for as long as possible.

I had a cohort in my early 20's that saw a demo of measuring oil quality in protecting your engine. As he described it, a small roller bearing was pitted against a steel wheel of a larger diameter, bathed in the oil as it turned. Measurable pressure was applied to the roller until it smoked. First to fail: Penzoil 30w. Best at the time: Castrol GTX 20-50.

So when I happened upon a similar demo, using weighted leverage to test additives I was keenly interested. The subject was a roller bearing against a hardened spinning steel surface. A stabilizing additive that I have used for YEARS was applied, and when 6 lbs of weight was applied it smoked. More of the same product was applied, at the same speed and weight leverage, no diff.

Enter the contender: a tiny swab of this product not only stopped the noise, but stopped the burning.

I bought a gallon. I have a few high mile cars that I wanted to try it on.

1. Wife's Euro twin DOHC V6. 162K miles. Cringe, even after oil change, on starting. At least 30-45s of clatter from the timing chains. NOW, 15s, if that.

2. '66 Olds Rocket 425 V8. Valve train tapping, on drivers side, intermittent. Now, Quiet...

3: My K10 TH350 is on her last legs. Keeping her clean to keep her alive. Symptom: funky double shifts- as in- reverse is felt, then positive engagement follows. GONE. ( I expect haters to go off on this one! All fun and games!

)

If you find this interesting, and acknowledged that I'm not a Troll (see history?) I'll be glad to share it with you

Read More | Write Comment

Preformed fuel line

January 15, 2026, 12:40:02 pm by metalcutter1
Views: 7775 | Comments: 5

I am trying to find a preformed fuel line for my 1979 GMC C-10 with a 454 big block.
It's the rubber line under the hood going from the steel line from the tank to the fuel pump.
I know that I can use rubber line from the a reel, but I want to keep it as stock as possible.
I don't know the part number(that would be a great help)
All of the preformed fuel lines that I have found are 3/8, this is not 3/8.
Everything about this truck is 3/4 ton, but it's a half ton.
Any help would be appreciated.

Read More | Write Comment

Brake Lights turn off if I have my lights on

January 08, 2026, 12:43:37 pm by juancano | Views: 6128 | Comments: 6

1986 C10 2WD

I've had a similar issue before but this is new.

Right side tail light: Brake light works when pedal is pressed; if I turn the lights on, the light on the tail light turns on (same bulb, 2 filaments). But, if the lights are on and I press on the brake, the bulb just turns off. So no light and no brake light.

- Replaced Bulb, tried 3 different bulbs
- Replaced socket (previous one was also a newish one)

What could it be? The brake pedal switch? Ideas?

Read More | Write Comment

Crossmember spacers?

January 08, 2026, 03:56:26 am by c.whites1911 | Views: 5386 | Comments: 1

1978 K10 stock height 305 w/ th350 with np203 LWB Hey yall, long time reader second time poster, took down my transfer case to replace my transmission pump and cant remember how the crossmember spacers go on, do they go above, below, in between? Also, when my pump went out , i grabbed another one from a parts transmission i have, will that work? It moves again indernits own power but shuddered a bit at first, itll go up through the gears ok but seems like its kinda stiff getting up there and has a vibration the whole time, pretty sure my rear seal on engine started leaking too, i changed all the seals on the tranny when i attempted to fix, the pump gasket seal, front seal, anybhelp would he appreciated thanks

Read More | Write Comment

Pages: [1]