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VS slips in overdrive only when hot and under load

Brett_jjj

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Id clear the error code by removing the negative battery termial for a minute or two.Then recheck them to make sure you are only getting code 12 and that it cleared properly,then after driving for a hour or so,recheck the error codes again to see if it has returned,if it has,this confirms theres a problem somewhere.(sometimes, if your lucky, error codes can just set from a "one off glitch" ).
The gregorys says that possible problems that could cause error code 76 to set, could be-blocked injectors,faulty spark plugs, or leaking exhaust or inlet maifolds on one side of the engine.I know that faulty oxygen sensors can also cause this code to set,they will also cause it to use more fuel than it should.If the oxygen sensors have done more than 100,000 k's,they should be renewed.I doubt this code will have anything to do with the transmission slipping problem but it still needs to be fixed at some point if you want it running right..
 

VPbomb

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Thanks bret_jjj. I actually had genuine holden spark plugs fitted last week when i had the CAS done, and they also said they cleared the codes. New o2 sensors went in months ago and i also re-wired earth at the ecu for it. I've done a lot of other things but always suspected a vacuum leak, so possible it might be inlet manifold. Will clear codes and re try at some point, cheers
 

VPbomb

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Anyone wouldn't happen to know if a 6HDD transmission will be an easy change over for my 7HCD (Column shift)? I didn't realise that the Column shift autos were different, just thought it was just the linkages. If anyone knows, let me know asap.
Cheers
 

hako

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I don't think it is a straight swap - see http://forums.justcommodores.com.au...column-shift-gearbox-straight-swap-t-bar.html
To get some breathing space you could try a tin of transmission treatment designed to firm up worn transmission....sometimes it works...but only temp. From the sounds of it if you had an external trans oil cooler fitted you may have had it last longer as they do tend to get hot when towing.
 

FstStig

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Oh and if any of you reading this drove past a white ute on the site of the freeway near Bendigo Sunday morning/midday with a fidge on it and jumper leads hanging off the side (or me standing there holding them looking helpless)... damn you for not stopping!

Yeah sorry about that, I was going to but then decided going to get laid was the better option. Hope you found some help :)
 

VPbomb

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I don't think it is a straight swap - see http://forums.justcommodores.com.au...column-shift-gearbox-straight-swap-t-bar.html
To get some breathing space you could try a tin of transmission treatment designed to firm up worn transmission....sometimes it works...but only temp. From the sounds of it if you had an external trans oil cooler fitted you may have had it last longer as they do tend to get hot when towing.

Mine has a trans oil cooler from stock. I'm not going to risk it as I transport by track bike around regularly, so would hate to break down with that on the back (worth more than the car!).
I spoke to a few people which say I might be able to swap over the selector shaft from my gear box to the 6hDD one as it is slightly longer (not sure if i'd have to pull the case off for that?)... but no mention about the transmission cooler lines as I thought I read somewhere the difference between the 6hdd and 7hdd was bigger lines... hopefully the fittings are the same.
Cheers guys, think I might take the gamble.
Luke.
 

VPbomb

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Yeah sorry about that, I was going to but then decided going to get laid was the better option. Hope you found some help :)

No worries. Is that your car in your sig? If so, i'm never stopping for a white VT if it's broken down! :)
 

hako

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Mine has a trans oil cooler from stock. I'm not going to risk it as I transport by track bike around regularly, so would hate to break down with that on the back (worth more than the car!).
I spoke to a few people which say I might be able to swap over the selector shaft from my gear box to the 6hDD one as it is slightly longer (not sure if i'd have to pull the case off for that?)... but no mention about the transmission cooler lines as I thought I read somewhere the difference between the 6hdd and 7hdd was bigger lines... hopefully the fittings are the same.
Cheers guys, think I might take the gamble.
Luke.

Mine has the 7HDD with screw fittings on the radiator and stock external cooler (which is pretty small)...I've seen people cut the trans oil lines near the trans and then rejoin with hose to avoid the hassles of removing the lines from the trans.
If I were towing anything large, I'd replace the stock external cooler for one suited to a V8 or 4WD...they have them on Ebay for under $200. Good Luck.
 

VPbomb

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Mine has the 7HDD with screw fittings on the radiator and stock external cooler (which is pretty small)...I've seen people cut the trans oil lines near the trans and then rejoin with hose to avoid the hassles of removing the lines from the trans.
If I were towing anything large, I'd replace the stock external cooler for one suited to a V8 or 4WD...they have them on Ebay for under $200. Good Luck.

Good point, didn't think of cutting the lines and joining them that way to make it fit.
Cheers
 

VPbomb

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Okay, for other people searching this site that want to know what's required to transfer a floor shift auto into a column shift VS (as I searched everywhere on this site and the net without any true answer including ringing auto "specialists"), then got the answer of a guy from ################ site and sounds like it can be done:

The selector in the trans has to be swapped over, the 7HCD will have a longer selector shaft, because the inhibitor switch bolts to the trans rather to the shifter in the car.

Its pretty easy to swap the shafts over if you know what your doing. Sump off, remove the detent spring. remove the 14mm nut on the inside of the shaft, unclip the spacer. its a good idea to get a small file and remove the small chamfer that the nut creates, its important to do this other wise it the shaft will be extremely tight in the bore.
then just slide the good shaft in and bolt it up.
 
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