4L80 hits 2nd hard

[roy c]

I Just had my 4l80 rebuilt in my 93 4x4 burb and when tranny shifts into 2nd
gear it hits hard some times shacking the dash board. no shift kit nothing that is not
factory the motor broke at 200,000 miles 2 weeks ago I'd figure I'd rebuild the tranny also,
when I got the truck back same issue. bought it back they can't figure it out. every thing in the tranny was
replaced does anyone have any idea's thanks Roy

 

[ChuckyB]

You probably have it fixed by now, but on the 93 and 94's the computers had an issue with sending a WOT siginal and the line pressure is maxed in the trany. For me the 1-2 shift was firm but livable, well I guess youre not supposed to have a shift that is harsh enough to make a 'burb "bump". It ended up striping the lugs off the inside of the case for reverse. I think they should have a small sticky just for the 93-4's on this. Not a trany problem, all ECM. Mine was on a 4L60 but the WOT sig would screw up any auto I'm guessing.



PS: It cost me 2 transmissions to find out also. =(

 

[SkyHighColorado]

You probably have it fixed by now, but on the 93 and 94's the computers had an issue with sending a WOT siginal and the line pressure is maxed in the trany. For me the 1-2 shift was firm but livable, well I guess youre not supposed to have a shift that is harsh enough to make a 'burb "bump". It ended up striping the lugs off the inside of the case for reverse. I think they should have a small sticky just for the 93-4's on this. Not a trany problem, all ECM. Mine was on a 4L60 but the WOT sig would screw up any auto I'm guessing.



PS: It cost me 2 transmissions to find out also. =(

yeah my 94 doesn't know what to do under wot. I just got code 82 (1-2 shift solenoid bad) replaced 1-2, 2-3, 3-2 and the pressure sensor and it now shifts like new. So maybe just drop the pan and swap out solenoids for acdelco and borg warner like I did.

 

[rhino]

All good advise. I would also check the speed sensors. If the input or output is bad, or criss-crossed it will give you a good bump on shift.

 

[Ruger_556]

My 4L60E does that exact bang shift into 2nd gear, hasn't changed at all in the 20,000 miles I've put on it since I bought it... No codes or anything.

 

[SkyHighColorado]

My 4L60E does that exact bang shift into 2nd gear, hasn't changed at all in the 20,000 miles I've put on it since I bought it... No codes or anything.

well you can fix that with the Kit I bought on ebay or Rhino sells them on his website I noticed. Its those solenoids and the pressure sensor plate that are causing the hard shifting I would be willing to bet. I spent close to $200 total and Its like I got a news trans.

 

[Ruger_556]

well you can fix that with the Kit I bought on ebay or Rhino sells them on his website I noticed. Its those solenoids and the pressure sensor plate that are causing the hard shifting I would be willing to bet. I spent close to $200 total and Its like I got a news trans.

More info or link on this?

 

[SkyHighColorado]

http://www.ebay.com/itm/181359671174?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT

That harness is for 93-93 I believe. You just drop the pan and remove filter and then start unhooking a pulling solenoids and replacing with new and slap a new filter in fill er up and enjoy.

 

[Ruger_556]

http://www.ebay.com/itm/181359671174?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT

That harness is for 93-93 I believe. You just drop the pan and remove filter and then start unhooking a pulling solenoids and replacing with new and slap a new filter in fill er up and enjoy.

Interesting, thanks You just change the solenoids or the harness and everything?

 

[SkyHighColorado]

I was going to change out the whole harness but since my truck is my dd and I couldn't afford anymore down time I didn't mess with the harness or the pressure sender solenoid because it involved removing a servo I believe to get room for it to slide out. So I changed out everything else.