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Just a heads up, I ordered a second gallon of Dexron VI after I realized I needed 2.7 quarts to do the transfer case too 👍

Well, if I can help it, I'd like to keep her 3l80 running right. I don't think the vacuum modulator is causing any issue, seeing as the shifting is normal once the trans is up to a good temp. So it's maintenance time. I'm gonna do fresh 80w-90 in front and rear diffs, and fresh Dexron VI in...

Thanks for all the helpful info. I think if I stay auto I'm definitely going with a 4l80. Even my girl agreed and she hates spending money lol. So hardware-side I'd need new cooler lines, driveshafts, shift cable, gear indicator, and move the crossmember. Also you mentioned a output-side...

Thanks for the replies guys. Ferm, can the valve body screens be removed/inspected with the trans in place? As for the 80e swap, I honestly figured if I could get quite a few things from a 91-93 truck, then that would be the easiest way to run an 80e. I know the later years made improvements...

Thank you guys! I'm excited to be here. I frequently read up on another forum.. g-m-t-4-0-0.c o m But there seemed to be many more guys over there running lighter duty trucks, 1500s and such. I also sort of have an oddball year with the TH400 and all. We have goals of getting a Lance (or...

Hey everyone. Pearl is starting to act up lately! There seems to be a F***ton of trans issues/questions threads on this site. So I'll make mine short and sweet. '90 8-lug K2500. Odometer reads 146,XXX. 5.7/TH400/floor-shift-TC(NP241?). 14-Bolt semi-float, 3.73, G80-optioned. I think that covers...

Hey everyone. My names Mike Taylor. I drive a 1990 GMC K2500 C6P, we call the Black Pearl. Original, I'm sure lol. I've learned a lot from this site and I wanted to join up and stick around a while, and maybe see if you folks can help keep Pearl on the road. 😁 Her TH400 is currently acting up a...