99 Silverado shifts hard

My 99 Silverado automatic shifts hard from 1st to 2nd.If I shut it off for 10 min it is ok. Any ideas? Thanks!

My 99 Silverado automatic shifts hard from 1st to 2nd.If I shut it off for 10 min it is ok. Any ideas? Thanks!


THIS USUALLY MEANS that the transmission is slipping in OD..then the pcm/computer commands the transmission to maximum line pressure,,which causes the harsh up shift...

when the engine is off this is then reset....

having the transmission examined for DTC . OEM specific drivetrain scanners required...not the generic type...

It is possible it is just a dirty filter or transmission fluid is shot..

IF YOUR LUCKY....

Thanks I will try a filter and fluid change

If it is not the trans filter and fluid, could this be areal costly problem?

don't guess, it's usually too late when your guess turns wrong. MANY have same issue, it's f-d up design. i fixed mine by replacing filter, doing fluid change, and adding lucas trannie oil.

When this happened to me I just installed the TransGo shiftkit, transmission has been fine ever since...

Bert

http://tinypic.com/ei2g51

If it is not the trans filter and fluid, could this be areal costly problem?

yes.. $2,000.oo

Thanks all ! Bert what is a Trans Go shift Kit ? Was it hard install?

Thanks all ! Bert what is a Trans Go shift Kit ? Was it hard install?

The TransGo Shiftkit is a set of parts to be installed in the valve body of your transmission, it's not that hard to install just take your time. I found my shift kit on Ebay for $35, this was the "professional" kit.

It's like this one: http://cgi.ebay.com/ebaymotors/GM-4L60-E-TRANSGO-4L60E-HD-SHIFT-KIT-T74171E_W0QQitemZ370228392594QQcmdZViewItemQQptZMo tors_Car_Truck_Parts_Accessories?hash=item563354f2 92&_trksid=p4506.c0.m245&_trkparms=65%3A12|39%3A1|72%3A1171

Bert

http://tinypic.com/ei2g51