Trans problem: Hard downshift to 1st

[hermannm]

Hi i just recently put a new engine in my car 1992 cutlass supreme. Same as the old one 3.1 V6. The engine came out of a buick and had a different trans in it as we had to move the passanger size trans mount and cut it a bit to make it fit. I never had any trans problem before the swap and now when it i am slowing down and it downshifts into first it makes a big bang. It seems to go away after the car warms up. I have disconnected the trans cable that goes from the TB to the trans but still have the problem. I didn't do the proper idle relearn procedure on the car could this be causing the problem? Only other thing i can think of is the torque convertor is pulled out a bit or a bent ring gear? Im not sure any help would be appreciated.

 

Thanks!!

[Crazy K]

wait... what?

 

did you replace the 3.1 with another 3.1?

[hermannm]

Yes i just did a straight swap. I blew the head on the original so i just did a straight swap to get it running again.

[Crazy K]

and to make sure, you aren't thinking a 3.1 and 3100 are the same?

 

what was the donor vehicle? I guess you lost the bracket that was attached to the original engine???

 

there are 3 cables at the throttle in a 92 3.1 car with a 4t60e:

accelerator: bottom, with a clip

cruise: IT has a loonnggg slot in it

and downshift. the downshift cable goe on the TOP connector bung and has a plastic clip (some might have a metal clip). check for it being connected.

 

 

next thing that may be needed is an adjustment for the cable... but I don't know how to do it, I would have to look it up later.

 

 

 

 

[hermannm]

No they are the exact same engine. it came out of a buick regal. i did lose the original bracket. I thought the trans downshift cable was the one with the little black connector on it and the long slot one is connected to the accelotor cable?

[RobertISaar]

92 3.1s didn't have the 4t60e, had vaccum based 4t60(440T4)

[Crazy K]

No they are the exact same engine. it came out of a buick regal. i did lose the original bracket. I thought the trans downshift cable was the one with the little black connector on it and the long slot one is connected to the accelotor cable?

MY BAD!!! FIXED!

[hermannm]

Its only downshifting into first and when i accelerate extremely hard it has hard upshifts

[Crazy K]

what year regal?

 

a 92 CS with 3.1 will have a 4t60 (non E) unless it has a 3t40.

 

a 88-92 regal with 3.1 will have a 4t60 non e, and a 93 3.1 will have a 4t60e

 

 

if the cable is hooked, it may need adjusted.

 

OR

 

it is a vacuum modulator issue. make sure the hose line is hooked up.

[RobertISaar]

no way is it from a 93 or later, the shift solenoids would never move, meaning he would be in 3rd(?) gear all the time.

[hermannm]

I will try adjusting the cable and check the vacuum line thanks. The buick was a 1990 or 1992 i think but it did have a different transmission. I have the downshifter completely off right now, thought it might help?? It did yesterday when i was driving around after the car was warm, never downshifted hard. Ill also try tightening the Air Cleaner down cause i can hear a hissing sound when the car is running. Thanks again.

[RobertISaar]

I will try adjusting the cable and check the vacuum line thanks. The buick was a 1990 or 1992 i think but it did have a different transmission. I have the downshifter completely off right now, thought it might help?? It did yesterday when i was driving around after the car was warm, never downshifted hard. Ill also try tightening the Air Cleaner down cause i can hear a hissing sound when the car is running. Thanks again.

 

that hissing noise is probably the IAC, nothing out of the ordinary. the tranny should be the same though, maybe a different gear ratio, but that should be the only difference.