Replaced my 4HDD box in my VR with a 6HDD

[mike49]

as the title states, the motor and trans is all in, ready for everything to be hooked up again, but the trans wires are hooked up, now ive done some reading and heard that the 6HDD box will not work if the previous box was a 4HDD? i hope this isnt true, i dont feel like taking the motor and trans out for the 3rd time,, all the wires are hooked up, linkage is hooked up, torque convertor is all hooked up, all seems fine, ive only started to worry because ive just done some reading up now....

[mike49]

i also should add, this motor (out of another VR) had a 6HDD trans on it in the original car..

when i put the motor in this current car, it ran like a dream, just needed to come out to put a new rear main seal in, found out my 4HDD was stuffed, so i replaced it with the 6HDD.

[BT1-355]

Nah you shouldn't have any problems. Only diffecerents is 4hdd has 12 pins and 5,6hdd has 13 pins

[mike49]

cheers mate

[gsxr1201]

I had my box replaced in a VR 5hdd... all good. But apparently the 6hdd is out of a vs. Computer reads different. If it works, I would love to know!

[VrWagz1]

Not sure but is the 13th wire somthin to do with the torque converter lockup? If so you may find it may not lockup. But if it all works when you drive it then i wouldnt worry about what you have read. Proof is in the pudding.

[mike49]

had to put the 6HDD big blue chip in the computer.... and then it decided to change into 2nd...what gear does the torque convertor lock up? im guessing 4th?

[mike49]

VR WAGZ was right, wont change into 3rd, then once its in second, wont go back in first unless your fully stopped and put it back in park then drive again, ***n sellin it, not rippin motor out for the third time

[AUSSIE91]

mate, the vs ecotec is more advanced within the wirring compered to the buick's if you were to change the box it would be recomended that you change to a vs auto pc before you try selling it, you may need to also change the engine wiring loom but you could normaly get them modified.
if i were you i would have thrown a manual t5 in while the engine was out thats what i did to my ecotec, the t5 was not ment for an ecotec getrag. but hey if u have the patience, do it right the first time to avoid head f***'s works a treat.
wish u luck man.
cheers Ryan

[gsxr1201]

When you put the torque convertor in, did you spin it till it locked one way, then spin the opposite way, til it clicked, then a 3rd time????
You have to do that to lock the convertor in.
i thought it wouldn't work, still we can only try and hope!!!!!

[mike49]

gsxr1201, i didnt do that, i just spun it until it went in.. might have to think about that...

[mike49]

aussie91, this motor and trans was VR series 2, it was still Buick motors....

[NeilB]

If your convertor was not in properly you would have probably busted the pump and wouldn't get any gears.

[deanos70]

i need to replace the engine in my vr as well, its auto

if i want to put an ecotec in it i will need all the below

ecotec motor and auto box

ecu, harness, bcm, keys ignition barrel ?

does anyone know if the gearbox mounts are in the same place in a vr as per vs etc

are the tailshafts from the vr going to be the same length

thanks