99 Tahoe advice

[THEFERMANATOR]

Originally Posted by Stinky_Hooker

There were no Pcodes. Its was low effeciency through caty convertors which he said was waaay before I started having problems, a fuel level sensor (which I knew, cause my fuel gauge doesnt work) thats it. I was hoping for a trans code but nothing.

I only took it to him cause he is really honest and wanted to see A: if there were trans codes and B: if it may have been an engine issue before concluding it was the tranny, which it obviously is. He gave me the # to a tranny guy he trusts and Im going to call him this afternoon when I get off work (left the number at home). If they work tommorrow I may run it by today, if not Monday. I been driving it in 3rd only 40 MPH or so to keep the shudder down to hopefully not cause any damage. I only drive 5 miles to work each way. No driving it otherwise.

The 2 conditions you describe would have both been a P code. The ECM reads out trouble codes for the powertrain(engine/trans) as P or powertrain codes. The cat efficiency code can EASLIY cause the problem you describe from it as I have SEEN it happen on 99 5.7's. This is why I said we needed to know what the P codes were to go off of, and NOT to trust the diagnostic trouble codes given for this engine as most of teh time they can lead you on a wild goose chase if your not familiar with the system. As for seals on teh input shaft, I find it HIGHLY unlikely the teflon seals have gone bad unless somebody pulled the trans apart and put it back together dry with a sledge hammer. Since the late 80's GM has used teflon sealing rings and they are VERY resiliant and hardly ever need changing even during a rebuild.

I haven't ever used one of these, but I have read good things about this for the P1870 repair for alot less money. Supposedly it will work better in valve bodies that are severely worn that the tRANSGO kit won't fix.
http://www.teckpak-fitzall.com/spgm.cfm?id=A74741Q

[Stinky_Hooker]

Well crap, to eliminate the cats starting to get clogged what do I do short of replacing them for alot of $$.