What did you do to your NBS GMT800 Tahoe/Yukon Today?

clandr1 · May 20, 2026

Monday my battery left me stranded at the haircut place. Wouldn’t even start after a jump.

Then, yesterday, my AC started going from cold to cool to warm and back. I did an HVAC actuator calibration, and it seemed to get worse. Apparently my 20 year old blend door actuator died during the calibration. So, ordered a genuine GM replacement from Amazon and it was delivered today. I just spent 30 minutes swapping it out and all seems well again.

Tonyrodz · May 21, 2026

clandr1 said:
Monday my battery left me stranded at the haircut place. Wouldn’t even start after a jump.

Then, yesterday, my AC started going from cold to cool to warm and back. I did an HVAC actuator calibration, and it seemed to get worse. Apparently my 20 year old blend door actuator died during the calibration. So, ordered a genuine GM replacement from Amazon and it was delivered today. I just spent 30 minutes swapping it out and all seems well again.

Was it the front actuator? How hard was it to do?

clandr1 · May 21, 2026

Tonyrodz said:
Was it the front actuator? How hard was it to do?

It was the blend door actuator located on the far left side of the passenger footwell, to the right of the center console.. It was very easy - only took about 30 minutes. I sprung for a genuine GM replacement which was pricey, but hopefully will work for another decade or two...

Amazon link to GM 89018365:

https://www.amazon.com/dp/B0011YHOE4?ref=ppx_yo2ov_dt_b_fed_asin_title

Link to video on how to DIY:

Scottydoggs · May 21, 2026

clandr1 said:
It was the blend door actuator located on the far left side of the passenger footwell, to the right of the center console.. It was very easy - only took about 30 minutes. I sprung for a genuine GM replacement which was pricey, but hopefully will work for another decade or two...

Amazon link to GM 89018365:

https://www.amazon.com/dp/B0011YHOE4?ref=ppx_yo2ov_dt_b_fed_asin_title

Link to video on how to DIY:

you either dont have a console, removed it, or have very small hands lol i left the console in, and my 3x glove wearing hands came out bleeding. royal pita job.

clandr1 · May 21, 2026

Scottydoggs said:
you either dont have a console, removed it, or have very small hands lol i left the console in, and my 3x glove wearing hands came out bleeding. royal pita job.

I wear XL gloves. The screw on the interior of the actuator was a pain in the neck and was by far the worst part of the job

LsHart · May 22, 2026

I put in a new reservoir . Old one was the color of a Kroger sack!

dps01 · May 23, 2026

Scottydoggs said:
toss some air bag helpers in the coils springs. they will keep the ass end up higher and level out the trailer frame for ya. and improve the ride when towing

When I refreshed the rear suspension of the 03 Z71, Timbren bump stops were used w/ new Moog Z71 springs and air bags for the Ram 1500 (allow higher pressure than the ones for the Tahoe) - complete PIA to install in springs but worth it (to me).

Springs were direct replacement in this case (old ones just worn out). New ones ~1.25” taller.

Old spring (w/red air bladder) & new (w/black):

Timbren Bump Stop & New Spring Setup:

Bump stop comparison; Timbren vs: Standard aftermarket.

mikez71 · May 23, 2026

Started to paint some flaking areas on roof, sunroof edge..
Unfortunately, I leaned onto the sunroof air deflector and broke it off! :banghead:

Looks like it's riveted in place.. I hope its replaceable somehow without installing an entire sunroof assembly..

Scottydoggs · May 23, 2026

dps01 said:
When I refreshed the rear suspension of the 03 Z71, Timbren bump stops were used w/ new Moog Z71 springs and air bags for the Ram 1500 (allow higher pressure than the ones for the Tahoe) - complete PIA to install in springs but worth it (to me).

Springs were direct replacement in this case (old ones just worn out). New ones ~1.25” taller.

Old spring (w/red air bladder) & new (w/black):
View attachment 486060

Timbren Bump Stop & New Spring Setup:
View attachment 486059
Bump stop comparison; Timbren vs: Standard aftermarket.
View attachment 486061

thats some beefy looking parts.

i got them red bags. didnt think they were to bad of a install really.

Tonyrodz · May 24, 2026

dps01 said:
When I refreshed the rear suspension of the 03 Z71, Timbren bump stops were used w/ new Moog Z71 springs and air bags for the Ram 1500 (allow higher pressure than the ones for the Tahoe) - complete PIA to install in springs but worth it (to me).

Springs were direct replacement in this case (old ones just worn out). New ones ~1.25” taller.

Old spring (w/red air bladder) & new (w/black):
View attachment 486060

Timbren Bump Stop & New Spring Setup:
View attachment 486059
Bump stop comparison; Timbren vs: Standard aftermarket.
View attachment 486061

Do you have a link to those rear bumper stops? I'd like to give those a shot--if they're cheap enough.

dps01 · May 24, 2026

Tonyrodz said:
Do you have a link to those rear bumper stops? I'd like to give those a shot--if they're cheap enough.

Cheap / Cost Effective is all relative…

Search

Timbren manufactures industry-leading truck suspension and trailer suspension upgrade kits. For Timbren SES, Off-Road Bumpstops, Axle-less Trailer Suspensions, and more, shop now.

timbren.com

They are available @ multiple vendors.

I got mine on an EBay “special”…

dps01 · May 24, 2026

Scottydoggs said:
thats some beefy looking parts.

i got them red bags. didnt think they were to bad of a install really.
View attachment 486066

Agree.
The correct (red ones) did install without too much issue.

The black ones are not designed for the Tahoe and are thicker and taller. I fought them tooth & nail during the install.

Would not have been able to install them with the springs mounted on the truck.

Brrdog93 · May 25, 2026

Today I straight pipes my 05 Tahoe LT. I already did the cold air intake not long ago. Next I'm doing a mail in tune.

ncalvo · May 25, 2026

Got stuck on the beach had to get dragged off.. not fun.. 4wd did not engage.
Switch works the lights changed, heard a clunk, but front wheels weren't spinning, no CEL

Also noticed recently when rinsing underneath my truck in my driveway there's a sheen of oil on the ground
I gotta crawl back under there and look I think its seeping on the passenger side
Thinking its the actuator or fork, possibly a bad seal now too

Run4st · May 26, 2026

Swapped out the transfer case encoder motor Sunday (only day with no rain)...seems be working fine. Also installed classic flow master series 40 muffler. Sounds good.

Fless · May 26, 2026

Took it for the bi-annual emissions test. Since it was on the road this past month we ran premium, not the usual E85. Although the 91 octane gas numbers are slightly higher than they were on E85, it still passed with flying colors. Almost 119k on the odo.

Next tank we'll go back to E85 since it's available around here.

ncalvo · May 28, 2026

so I am pretty sure my power steering pump is crying little tears
thinking of replacing it with a Lares pump

considering getting a new steering gearbox while im in there, it should be the last part to tighten up my steering since i've done all the rest of it.
anyone have success with new Lares units? are they worth it? is it the same amount of turns lock-to-lock for the same factory feel?

mattbta · May 28, 2026

Fless said:
Took it for the bi-annual emissions test. Since it was on the road this past month we ran premium, not the usual E85. Although the 91 octane gas numbers are slightly higher than they were on E85, it still passed with flying colors. Almost 119k on the odo.

View attachment 486318

Next tank we'll go back to E85 since it's available around here.

I paid $3.50 for corn on Tuesday. I'm sure it's been high for you out in CO, but that's the highest I've ever paid here in DFW.

Fless · May 28, 2026

mattbta said:
I paid $3.50 for corn on Tuesday. I'm sure it's been high for you out in CO, but that's the highest I've ever paid here in DFW.

Gas Buddy says the local Maverik (my usual place) is $3.69. I won't need any for a while unless I decide to drive it more. I have a few runs to Lowe's to pick up bags of mulch, so it'll be getting some exercise.

mountie · May 28, 2026

ncalvo said:
so I am pretty sure my power steering pump is crying little tears
thinking of replacing it with a Lares pump

considering getting a new steering gearbox while im in there, it should be the last part to tighten up my steering since i've done all the rest of it.
anyone have success with new Lares units? are they worth it? is it the same amount of turns lock-to-lock for the same factory feel?

Never heard of the Lares box. I just put in a "Plews & Edelmann"box. Completely new including the housing.
Guaranteed for life. Includes a pressure dyno sheet. I LOVE THE BOX…. ( just a little faster turn )
They are not the cheapest….. But it’s worth it.

What did you do to your NBS GMT800 Tahoe/Yukon Today?

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