99 Silverado shifts hard

[rzbeamboy]

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

[j cAT]

Originally Posted by rzbeamboy

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....

[rzbeamboy]

Thanks I will try a filter and fluid change

[rzbeamboy]

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

[ukrkoz]

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.

[ColoradoSilverado]

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

Bert

[j cAT]

Originally Posted by rzbeamboy

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

yes.. $2,000.oo

[rzbeamboy]

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

[ColoradoSilverado]

Originally Posted by rzbeamboy

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-4L...%3A1|72%3A1171

Bert