tranny?

[metallica21156]

i noticed since i got the truck that if i shift from park to drive the truck lunges foward and from 1st to 2nd it shifts hard put if i'm pushing the truck its fine. its a 95 GMC jimmy,4.3 V6, auto trans.

[Rick Norwood]

When you say it lunges, is it more like a slam or a nudge? A little nudge is pretty normal, if it is slamming you're in for a serious problem. Take it to a tranny shop that gives free estimates. My 93 S-10 blazer went into some heavy-duty slam shifting and the tranny had to be rebuilt to the tune of $1500. USD.

[metallica21156]

if u don't hold the breaks real hard it will slide forward a little but doesn't keep going. only when you shift. what about the 1st to 2nd gear? it dosen't slam hard. it just isn't smooth like all of the others and like i said that if i'm pushing the truck it shits right. i was told its some eletronic crap under the filter.

[BlazerLT]

What is the engine rpm when you are doing this?

[metallica21156]

well if i'm below 3,000 it shifts hard but if i'm higher then that it shifts fine. its only 1-st to 2nd. all other gears shift fine at any rpm.

[BlazerLT]

I am talking about when you put it from park to drive it lunges forward.

What rpm are you shifting out of park at?

[metallica21156]

it would sit around 650. it also lunges in reverse a little. didn't know if that would help.

[BlazerLT]

650? Well, that is not bad.

Of course the truck will want to move forward a bit.

Aren't you exaggerating a bit?

[metallica21156]

i never had a car do it to me before. it slides so i don't really care about that. i'm want to know about the shifting really. its more important to me. the truck has 72,800 miles on it.

[BlazerLT]

Have you ever got the tranny serviced?

New Fluid and Filter?

[metallica21156]

it did before i took it in and after. the fluid looked real bad and i had the system flushed last feb. so its good to go. the fluid still looks bright red. i've only put 2,000 miles on it since it was done.

[BlazerLT]

Your Tranny is computer controlled.

Reset your computer and see if that helps. Pull ECM fuse out of the fuse block on the driver's side end of the dash.

[metallica21156]

i've done that before. my SES light was set off 2 times when i had to change my O2 sensors. it didn't make any diff.

[BlazerLT]

Do you have the check engine light now?

Have you had your codes scanned lately?

When did you last reset the computer?

[metallica21156]

i reset it about a week ago. it was reading a EGR code which i fixed and then reset the computer. other then that there was no codes about the tranny. i looked my self and didn't find any.