Trans acting funny

[jroman]

so this morning i am going to work. start truck. notice abs light on. i did see this on yesterday when i started the truck. after 1-2 minutes. the light went off. so i thought nothing of it.

this morning, start truck see light. head off to work. same- light went off a few minutes into drive. but something seemed weird. almost felt like the trans was not shifting as normal.
i stop and started several times- looking to feel trans shifting, but didn't seem to be acting correctly.

leaving work.

start truck- see abs light. pull out of my spot and usually from where i park to the stop sign, i can alway feel truck shift. no shift.

i make a right onto the main road- screaming- as if to be stuck in first -
couple hundred feet. i notice everything on dash- GOES DEAD- rpm- speed- every needle dropped to 0

then seemed to correct itself and from there to the house. truck seemed to shift fine.

i believe yesterday on the drive to work. i did notice the same dash play- momentarily, everything goes to 0
and then truck is fine????


any ideas?? and if i am posting in the wrong place. please let me know and i will move.

truck is a 97 tahoe- 4 door- 4x4- 96k

 

[OR VietVet]

Hopefully @rockola1971 will chime in to help. He's a trans guy I have grown to trust, as well as other members here. It could be something like the grounds causing problems though. Lots of threads here about that. Here is a link about this type of repair: https://www.fixmyoldride.com/Chevro...e7e5cd24ed24635&at_ab=per-2&at_pos=3&at_tot=4

 

[bigfootchiro]

All lights and gauges on dash went dead when this was happening? If so, sounds like a bad main ground to me

 

[jroman]

watched it again yesterday- not all gauges- just the tach and speedo go dead. left in the morning and seemed to not shift out of first. until gauges go dead. and i pedal it. not sure if it then takes 2nd or what but make it to work driving 40-50 mph and the truck revving around 3k.

left work. did small circle in parking lot. watched gauge die - pulled out and drove home as if nothing ever happened.....

reached home- had to run and get cash - went from stuck in first- to NOTHING- where i give gas and all that happens is engine revving- then eventually brake light goes off after gauges die and truck runs ok again???

at a loss.

 

[swathdiver]

VSS, Speed sensor? Check the wiring for the speed sensors.

 

[jroman]

what is VSS? - location?
speed sensor = location?

thanks- sorry- not sure where things are located or what to be checking

 

[YukonRog]

Need to scan it for codes. Could be the ECM reacting to the ABS loss of communication and shutting everything down. I know on later models it can actually apply brakes and close throttle.