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SE Level Member
04-12-2018
I have a 2004 comp g. Abs tcs asm is all off. I don't care if the tapshift works or not. I want to put a normal 04 05 transmission in it for abundance reasons. I understand that gearing needs changed and possibly all the trans tables which is not a problem. Also passenger cvaxle. This is possible right? I also realize I won't be able to shift into 1 or 2 due to selector traveling less. Aside from the stuff I mentioned I should be good right? Do I have to change trans function other than gearing? I searched for a bit but just didn't my answer in a timely enough manner lol.
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SE Level Member
04-12-2018
Ok I see I also have to repin my trans connector. I'm totally up for this. The car itself is immaculate and I'm sick of spending so much on tapshift trans. Anybody have the diagram or know what pins need worked?
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04-12-2018
not sure what tranny your thinking of using, but a comp g is stuck with a comp g tranny, unless you plan to re wire the car. that whole car is somewhat unique.
98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails
L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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SE Level Member
04-12-2018
Oh that turbochargedsbc guy with the duel engine car said (in a post long ago) he had to just do that stuff^^^^. I know you know though Scott so I'll go buy a normal grand prix and top swap it I guess.... lol
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04-12-2018
I'll take a look at the wiring. I've seen people do the reverse where they convert from stock to tap shift. You'd have to flash the non- comp g tune I think, but it should be doable. Also, just grab a non hd trans and swap your differential. That'll keep the same gearing and you keep your axle and stronger differential. The inside of the comp g is exactly that except the valve body has one extra solenoid for tap shift and some extra passages, but that's it. Nothing magical about comp-g. The shifter is a direct swap so I'd grab one from the junkyard, or I'll grab one. I'll take a look at the wiring, but it shouldn't be bad...
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SE Level Member
04-13-2018
That would be cool to know what's all entailed. I have 5 cores and a trans in the car now. The trans in it has no second gear. All the cores are bad in some way or another. There probably one with a good valve body. I've contemplated swapping the valve body to a different trans. I still might do this but I wanted to weigh my options. The last tapshift trans I bought was 900 dollars and had 190000 miles. It's the only one I could find locally. Programming not an issue. I thought the bcm was what was mainly different, which is why I specified that I don't use abs traction control or stability management. I'm NEVER selling the car so odometer readings not registering also doesn't matter. I believe the bcm controls that also. And my dic but don't care lol. I've never went down to the valve body in a trans. I've swapped selonoid more than once though. Maybe I should look into this route?
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SE Level Member
04-13-2018
Honestly, swapping valve bodies may be easier. I don't have a stand to put my trans on. I could buy one not a big deal. My concern is I cannot find anyone who has done this. Do I just get an '04 trans and swap valve bodies and that's that. (Change gearing too) Or do I have to also rewire the trans pin? If it's as simple as JUST swapping valve bodies and a program gear change, then I would lean toward this way much more...
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04-13-2018
Sounds like you should really get a couple of different manuals in front of you. I have them, but haven't gotten the VMware player setup yet.
You have a few different things to keep in mind.
**Huge one here, if you change the valve body you should always change the pump shaft and channel plate too.
Depending on year:
-One of the transmission line connectors is going to have the check ball in it instead of the valve body. This is important because GM changed the size and thread of where that fitting screws in. You need to consider if you have threaded trans lines or click in lines. The majority are click.
-Pressure switch (mounted on valve body) is different.
-03 is it's own animal from a valve body/channel plate persepctive. I'd skip this year.
-04 to 08 are different pressure switch and valve body/channel plate/pump shaft from 97-02
-Comp G is a different channel plate and valve body.
Differences from an HD to non-HD are:
Output shaft length (although it's not enough to make a difference)
Diff and diff cover length/size.
Torque converter size and converter code. (245mm or 258mm)
Gear ratio due to the drive/driven sprockets 1.00 or 1.121 (35/35 or 33/37)
Differentials aka final drive ratios are 3.05, 3.29, 2.86
Wiring differences:
They do exist, but they are simple to identify and the connectors are easy to repin.
External PNP vs Internal simple again to work with.
I think that's most of the stuff to keep in mind.
I drink..so consider that when reading my posts.
2010 Audi A6 Dual IC's
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SE Level Member
04-13-2018
Alright awesome. Thanks. And to clarify the stand comment was because I've read you want gravity working with you when dealing with the checkballs. There's a few manuals in the Dropbox I have saved for sure. Tonight ill grab a valve body, pump shaft and channel plate out of one of my bad trans. 04 to 04 should be all internal pnp I think.
Last edited by Prd2010; 04-13-2018 at 07:19 AM.
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04-13-2018
Do yourself another favor.. look up the thread by me on swapping the 4th clutch hub to fix it. That thread tells you which bolts to take out to remove the valve body/channel plate as one piece. This keeps you from touching any checkballs and the only gaskets you'll need are the latest version of the channel plate gaskets.
Do yourself another favor.. keep the long bolts you take out of the donor trans. cut the heads off four of the ... uh 6mm or 8mm diameter ones. You can use them as guide pins in order to keep the gaskets in place and hold things while you slide the channel plate/vb into place. When I did that.. I could easily do the job right in the car. You'll know which ones you need when you see where the gaskets go. Then you thread in a few of the bolts and you can take your "dowels" out. That's actually in the manual, except they call them dowels or j tool. It's fancy way to say.. headless bolt.
I drink..so consider that when reading my posts.
2010 Audi A6 Dual IC's
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04-14-2018
Personally I'm a fan of full rebuilds, but I'll leave that decision up to you. If you do decide to do a full rebuild, here's a few things you'll need:
Amazon.com: SST-0015 - Universal Lip Seal Installer / Remover Transmission Tool: Automotive
Amazon.com: Lubegard 19250 Dr. Tranny Assemblee Goo, Green, Firm Tack Lubricant, 16 oz.: Automotive
Amazon.com: Goplus Automatic Transmission Clutch Spring Compressor Removing / Installing Tool Kit: Home Improvement
The top tool is for the lip seals, it really isn't the best tool out there, but with some practice, it works well!
Second one is the lubricant you'll need so that it has some lubricant when you start it up for the first time. I've even shipped a trans halfway cross country and this stuff was still in place! You'll use trans fluid on some things and this on others. Rule of thumb, using more doesn't hurt anything.
Last tool again, isn't the best one out there, but it gets the job done. On the second clutch I had to cut the tabs off an old steel friction plate I had and use it to "even out" the pressure of the compressor so it doesn't bend the springs, and it doesn't reach one of the clutches, but I have a shop press so I put the top of this tool in it and it worked. you have to get creative unless you want to spend lots of money on a high end spring compressor.
100% hands down, this is the best video tutorial and manual I used (and still use):
STOCK DVD VIDEO TRANSMISSION REBUILD OVERHAUL MANUAL 4T65E 4T60-E 4T60E TRANS | eBay
You can honestly do a rebuild first time in a day or two using this manual, it's that comprehensive and easy to follow.
Other than that, we're here for any questions or help you might need! If you don't think you can tackle it, I've got a core I'd rebuild if you wanted to make the drive? lol
