Free to me GMC 2500

[Dantheman1540]

Swapped O2 sensors to see if the code pops back up, the original sensor looks to be OEM so it’s old as dirt. Code hasn’t popped back up yet maybe cats are fine.

Drained rear diff oil and whoa it’s not looking great. Lots of fine particles on drain plug and oil looked like unicorns blood. Definitely the worst gets oil ive seen as far as break in goes. The pinion also seems to have a lot of backlash but that’s just me using my hand. The gears look great and the locker works great so I clean it up and put it back together. I texted pics and a video to my axle guy and he said it looks kinda excessive however, it was used gears and I did do some burnouts so it might just be gear wear. He thinks the sparkle looks more like gear material than bearing and I do kinda agree.

I slapped fresh oil in and I’m gonna recheck in 500 miles, then put 75-140 in it and see how it sounds. If it’s worse then he will warranty the work and even buy gears if necessary. Which is kinda too much I wouldn’t let him buy parts since it was used stuff to start with. This axle had been pulled from a wrecked H2 hummer so who knows if it had a problem to start with.

Either way, it’s button up and I’ll keep on riding!

 

[99xcss4]

if that is the eaton govlock g80 do NOT use a oil with friction modifiers in it read post #2 it is for all g80 rears https://www.gmt400.com/threads/differential-fluid-for-14-bolt-10-5-gear-with-g80-eaton-locker.27972/

 

[Dantheman1540]

if that is the eaton govlock g80 do NOT use a oil with friction modifiers in it read post #2 it is for all g80 rears https://www.gmt400.com/threads/differential-fluid-for-14-bolt-10-5-gear-with-g80-eaton-locker.27972/

Nope it’s a used Eaton E locker, and used gears. Does it need friction modifier? Prob not, but it shouldn’t hurt anything and the 75-90 valvoline in those bags was on sale so that’s what it got.

Next fill will be 75-140 Lucas as requested by axle guy

 

[99xcss4]

I do not know anything about the eaton e locker but I do know from reading that posi additives or a friction modifiers in the g80 govlock will cause slipage

 

[Dantheman1540]

I do not know anything about the eaton e locker but I do know from reading that posi additives or a friction modifiers in the g80 govlock will cause slipage

Yeah I’ve heard that too, not a big G80 fan, not sure anybody really is once they used a good locker or posi.

 

[Dantheman1540]

Well good news is the noise I’m hearing seems to be quieter. Not sure if I’ve damaged my hearing that much recently or maybe it was not the rear end at all and something different that worked itself out.

I have the Walbro fuel pump and spectra pickup tube that was suggested in route now so I think I’ll start on that this weekend. Also need to pull the gear selector handle out and clean up the threads for the set screw and maybe get a new set screw or handle. It felt like it was cross threading when I initially tightened it and it never got all the wobble out. Pulled it last night and confirmed the threads are kinda jacked.

 

[99xcss4]

Yeah I’ve heard that too, not a big G80 fan, not sure anybody really is once they used a good locker or posi.

they have their problems but the ones that are in the 9.5 14 bolt 10.5 14 bolt and the aam 11.5 are beter then the ones that end up in S-10s 10 bolts and 12 bolts they all can sill bow up but some more then others

 

[Dantheman1540]

they have their problems but the ones that are in the 9.5 14 bolt 10.5 14 bolt and the aam 11.5 are beter then the ones that end up in S-10s 10 bolts and 12 bolts they all can sill bow up but some more then others

I think they work a lot better in an auto than a manual too. The g80 in my 5speed Tahoe with the 9.5” just sucks. It does very strange things like unlocking under power and I didn’t think would ever be a g80 issue

 

[Dantheman1540]

Big win! A quick thread tap and new bolt from Ace solved my shifter issue, I slapped some blue loctite on the threads as well.

 

[Dantheman1540]

Does anyone know if the 96 obd2 will show me trans temp if I hook up some sort of scan gauge or ultra gauge device? I think I have an ultra gauge laying around somewhere and I’d love to know trans temp.