Trans jerk when cold

[gw84]

99 5.3 silverado.

I always start this truck and let it run a few minutes before driving. Drive slowly for the first couple of minutes as well. Typically it seems to shift from 1st into 2nd somewhat hard when it's cold (almost like it's being slung into gear if that makes sense). After those first few minutes it shifts just fine. Thoughts?

[Blue Bowtie]

High line pressure due to cold (thick) oil.

[gw84]

Originally Posted by Blue Bowtie

High line pressure due to cold (thick) oil.

not uncommon? It seems like it happened in the summertime as well but I assume you mean "cold" as in "having not been running for a lengthy time"

[j cAT]

[quote=gw84;7206628]99 5.3 silverado.

I always start this truck and let it run a few minutes before driving. Drive slowly for the first couple of minutes as well. Typically it seems to shift from 1st into 2nd somewhat hard when it's cold (almost like it's being slung into gear if that makes sense). After those first few minutes it shifts just fine. Thoughts?
[quote]

about 17 yrs ago as the cold weather came , temps around 40F I was having the upshift harsh when cold engine .. so I called up service manager he said this is normal as the tranny has a temp sensor and when its below a certain temp the upshifts will be stronger and also delayed ,but when the tranny temp rises then it should shift normal..

so when it is cold out I will start engine let it idle 5 min then shut it down . then 15-20 min later start it up and the harsh upshifts most times will not do it.

on a day like now zero F out I will let it run 10-15 min .. also cover radiator with a plastic sheet . warms up faster save on the gas .. upshift delay when this cold I certainly do not like ...only vehicle I have owned did this ..

[gw84]

Originally Posted by j cAT

about 17 yrs ago as the cold weather came , temps around 40F I was having the upshift harsh when cold engine .. so I called up service manager he said this is normal as the tranny has a temp sensor and when its below a certain temp the upshifts will be stronger and also delayed ,but when the tranny temp rises then it should shift normal..

so when it is cold out I will start engine let it idle 5 min then shut it down . then 15-20 min later start it up and the harsh upshifts most times will not do it.

on a day like now zero F out I will let it run 10-15 min .. also cover radiator with a plastic sheet . warms up faster save on the gas .. upshift delay when this cold I certainly do not like ...only vehicle I have owned did this ..

glad to hear it. It shifts fine once it's warm and through the other gears so I didn't think it was a problem. It does seem delayed as well, I'm glad you mentioned that. I'll be running around 30 thinking "ok shift already" usually it warms up pretty quick, but I may try covering the radiator. I always see semis and buses doing it.

[j cAT]

yes the delay upshift is 30MPH when cold .. high revs then a harsh shift..
normal on these ..