Q1: REVERSE IS DEAD TOO?>
no VIN told or if transmission is automatic. or manual
no engine told of 3 and tranny size matches engine power
4L60-e transmission is on 5.0L gm engine.
I think most Envoy are A/T boxes. USA, shows this .
PRNDL. Reverse. Drive and Low fail? say those words
is east,.
the transmission needs service, vast problems possible
they are complex.
causes, top:(SCAN THE PCM IS WISE SEE IF IT SEES A HUGE PROBLEM THERE.) BUT REVERSE DEAD IS A VERY BAD SIGN. SCAN THE PCM FOR SOLENOID ERRORS!
- ATF oil leaked out of box and now dry, diP stick it? ATF smells burnt or looks like TAG is bad news. or metal flakes in the ATF DRIPPED TO A SHEET OF PAPER.
- fuses blown but most time reverse still works.!!!
- transmission shift linkage failed. (the service manual covers the steps to check that, Read the SM?)
- transmission shift solenoids bad. (reverse? has none)
- transmission is bad. (means removal time)
NOW IF REVERSE FAILS
ALL THESE THINGS HAPPEN TO ATTAIN IT.
you asked so here is a complex answer, (not all)
AND LOTS MORE TO FAIL.
http://67-72chevytrucks.com/vboard/showthread.php?t=447470
air filter is new..someone said it could be a vapor lock?
I'd take a look at the engine and make sure you are actually making adequate power. If not, the reason it will go better in 4wd low would be that it is a lower than normal gearing and does not put as much load on the engine. Granted, you may have a trans problem but it will need better and more specific diagnosis to determine what's going on.
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