Recent Posts

1

Power Windows & Door Locks / Re: Power window and lock conversion with harness connections inside cab

« Last post by VileZambonie on June 09, 2025, 05:31:16 pm »

Some easy telltales are the power lock relay will be to the right of the steering column, there will also be a pink wire tapped into the fuse box with a circuit breaker. It will also have the bumped out kick panels to clear the wiring harness.

2

Instrumentation / Re: Fuel gauge off ?

« Last post by Captkaos on June 09, 2025, 04:20:22 pm »

you posted this as a question to a post that was 11 years old, are you having issues with your fuel gauge?
Have you read the functional testing post here: http://forum.73-87chevytrucks.com/smforum/index.php?topic=25339.msg211241#msg211241

3

Body, Glass & Paint / Re: 77 Suburban Color Mystery

« Last post by Captkaos on June 09, 2025, 04:16:21 pm »

TC20906 T= GMC C = Conventional Cab (includes Suburban) 20906 - 3/4 C series.
86L 20 = 86 = Midnight Black with 20 = Lite Blue (light)
ZY3 = Special Two-Tone.  top = 86 middle = 20  (no idea what 35 is, not color with that number)

More here: https://www.gm.com/content/dam/company/no_search/heritage-archive-docs/vehicle-information-kits/chevrolet/1977-Chevrolet-Suburban.pdf

4

General Discussion / Re: OBS forum/wiring diagram?

« Last post by Captkaos on June 09, 2025, 03:35:06 pm »

Personally I would use this link instead..  https://67-72chevytrucks.com/vboard/showthread.php?t=700011

5

73-87 Chevy & GMC Trucks / Re: Rear axle is 7/16” off center

« Last post by Captkaos on June 09, 2025, 03:24:06 pm »

12 bolt truck axles were ONLY used in trucks and only in leaf spring configuration from 1973-81 (previous years GMC's had them also).
If the spring perches are factory and they are spaced correctly on the axle, then I would start suspecting frame damage, worn spring bushing, bent shackles, or the flip kit is not centered.
NONE of these are going to be "perfect", but I would advise that you have room for tire deflections when trying to stuff the biggest tire possible for what you are finding.

Are the flip kit perches welded in and meet up to the saddles properly?

6

LT/LS Swaps / Re: Fuel Line Question

« Last post by Captkaos on June 09, 2025, 03:12:58 pm »

you need 14mm/16mm O-ring to -6AN adapters to connect to the existing fuel and return lines on the truck I got mine from Pure Choice Performance.
5860 = 14mm
5870 = 16mm

You can get them just about anywhere though.

you can see them in use here: http://forum.73-87chevytrucks.com/smforum/index.php?topic=12120.msg208199#msg208199
This is where my whole LS swap was documented from start to finish

7

LT/LS Swaps / Re: Fuel Line Question

« Last post by devildogmech on June 09, 2025, 11:11:15 am »

OK, I think I have it figured out. The 87' Sending unit has a "Butt Flare". This was the fuel fitting of the time. I checked and I think I have the correct fitting now. As soon as I know for sure, I'll let ya'll know.

8

73-87 Chevy & GMC Trucks / Rear axle is 7/16” off center

« Last post by Lowellguy1 on June 09, 2025, 05:49:42 am »

Hello, I have a 87 R10  (rear axle flip) with a 12 bolt (5 lug) that I cannot verify it’s part number because it isn’t  located where it should be.  This leads me to believe it could have been a swap from another gm vehicle. All mounts are oe and the locations are centered (based on the C/L)  of the pinion.  When I compare the inside distance from the tire to the frame rail they differ by almost 7/16” It might seem minor but I have the widest wheel possible to tuck in there with the stock wheel well and it is almost hitting the bolts on the inside (drivers side).  Yes the bed is squared and centered on the frame rails.   

Any suggestions are always appreciated.
Thanks


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9

Power Windows & Door Locks / Re: Power window and lock conversion with harness connections inside cab

« Last post by Lowellguy1 on June 09, 2025, 05:36:24 am »

Thank you


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10

Exhaust / Re: Header recommendations for 305

« Last post by VileZambonie on June 08, 2025, 06:22:38 pm »

eBay