GM OD tranny fit?

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KramerSwinger70

KramerSwinger70

70 Dart Swinger360
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i read sumwhere that theres an OD GM tranny that fits under our A-body tranny humps. wut is this tranny and would it work on my 360 build in my 70 dart? if i can get OD i want it i know ima bug the Mopar-only parts guys but trust me its not that im defiyin i jus dnt wanna cut up my car for a 518 or w/e
 
Theres several GM O.D. trannys. From what I remember, the older ones/first ones, there no longer than the 3spds they replaced and they will fit under / in the trans tunnel without cutting/hacking it up. You'll just need an adapter between the engine and bellhousing.

I'm not real clear on this anymore. I used to know how it was done.

Ask Redneck55 or maybe "The mob fiat"
 
TH200R4 would be the smallest and best gear setup to work but it cost a good chunk of change to get it done properly with all the right parts.
 
yeah the idea for me is to CHEAPLY arrange my car for optimum mileage and power. i know u guys think who cares bout mileage but i cant afforrd 2 buy a $500 beater and i want to brag bout my cars stats wen i roll up 2 a newer car, ya know?
 
get a 200r4, you can find them under GM G-Bodies Monte Carlo Grand Prix Cutlass and regal/ Grand National. The 200r4 can handle lots of power. A guy that lives next to my Grandpa owns 3 Grand Nationals: 1 all stock 30000K original, 2 mild build 500 horses, 3 full out race thing dyno (I held and looked at the slip) at 1200hp at the wheels using the 200r4.
 
That's funny, at 1200 horsepower a stock 200r4 will blow chunks all over the track yet you guys seem to think you have to have a 727 behind your 400 horse 360.

It costs a lot of money to make a 200r4 withstand any kind of power. However if your car is mostly stock it would suffice for your purpose. You need to shop around though for either adapter plates or the JW bellhousing. You'll also need a flexplate to fit the Mopar crank, and the GM converter. The adaption alone could be expensive just to mate it to the engine. Then you have the crossmember, driveshaft/slip yoke, shifter linkage, TV cable and speedometer hookup.
 
I never said that 1200hp trans was stock. It was built! However that 500 hp one had very few upgrades and it does just fine (guy drives it 56 miles round trip, to and from work everyday). All I can remember right now is he said that he had to change ? from a 7 vein to a 10 and (two more upgrades)??? that was it.
 
There is a member here that has a 700 in his car, believe it fit with very little if any surgery. I can tell you a 4l80e will not fit without some serious cutting....and a $500+ bellhousing...
 
inkjunkie said:
There is a member here that has a 700 in his car, believe it fit with very little if any surgery. I can tell you a 4l80e will not fit without some serious cutting....and a $500+ bellhousing...
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How is that coming Ink?
 
Following is a post I made on a similar subject back in 2008. I haven't pulled the trigger on this yet due to a couple of economic setbacks along the way, but still planning to when the funds are available.
Contact Art Carr directly at California Performance Transmissions, he's been building great transmissions for many years.


"I've been thinking about a 200-4R behind a 360 magnum crate motor in a '69 Dart for the past week or so. Talked to several tranny companies about it and finally contacted Art Carr at California Performance Transmissions last week. He estimates total cost including converter and installation at about $3300. This does not include a new 8" longer driveshaft since the 200-4R is 8" shorter than a 727. It's also lighter and doesn't have as much HP loss through the transmission. The gear ratios are better than the 727 and it does not require trans tunnel surgery to fit. Art says he has a customer in PA with one behind a 406 stroker that runs 11.80s and still pulls down 25 mpg on the freeway.
Somebody tell me something bad about this setup......"
 
ocdart said:
Following is a post I made on a similar subject back in 2008. I haven't pulled the trigger on this yet due to a couple of economic setbacks along the way, but still planning to when the funds are available.
Contact Art Carr directly at California Performance Transmissions, he's been building great transmissions for many years.


"I've been thinking about a 200-4R behind a 360 magnum crate motor in a '69 Dart for the past week or so. Talked to several tranny companies about it and finally contacted Art Carr at California Performance Transmissions last week. He estimates total cost including converter and installation at about $3300. This does not include a new 8" longer driveshaft since the 200-4R is 8" shorter than a 727. It's also lighter and doesn't have as much HP loss through the transmission. The gear ratios are better than the 727 and it does not require trans tunnel surgery to fit. Art says he has a customer in PA with one behind a 406 stroker that runs 11.80s and still pulls down 25 mpg on the freeway.
Somebody tell me something bad about this setup......"
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Its not a mopar tranny. thats the only problem anyone could have. $3300 is an awful lot of money though. and thats how much it costs to mate the 200-4r to a 360? cuz there is no way im cutting my tranny tunnel. not worth it for OD id rather stick w/ my 904 like i originally planned that cut my car for OD. thats why im thinkin bout this GM swap. money aside, though, how hard is the conversion to make?
 
I know Art. He's a great guy. We've used quite a few of his tranny's and have not really had any problems at all. (one leaking pan gasket, one geometery issue on a tv cable, more my bad than anything...) The shop I work for has put this trans behind quite a few nasty big block Chevys, so it at least has a chance of surviving behind a mostly stock Mopar smallblock.....
 
i shudnt be puttin much more that 300-350 horse through this 360 so im sure pretty much any tranny i go with can take it.

So just to be sure, the GM tranny with OD that will fit my tunnel w/o cutting the tunnel is the 200-4r? it fits so i jujst need to get the adapter, ect?
 
Revhendo said:
How is that coming Ink?
Click to expand...
Fab work is done, will be driving to AZ in a few weeks to bring the fenders down and meet with the body guy. Was hoping to avoid AZ until November or so, but the body guy has a few projects lined up so I got no choice.....
 
Yes it will fit in the trans. tunnel but you are looking at modifying the crossmember, a custom driveshaft, torque converter, flexplate, adapter, cooler lines, dipstick, tv cable, etc., etc. You could easily double your 500 dollar beater car cost just to get the other components to make it work. A worthwhile upgrade for someone with the funds to do it.
 
For the cost diff, how much fuel could you buy, and how many years would you have to drive it to just break even cost wise?
 
well im startin to think ill stick with my 904 until i feel the need to cut the car up for OD. i suppose its not sumtin i really NEED on my car, just would like to have it, thats all. but i certainly dont want to drop that much cash into my transmission, especially if its not even true-blood mopar. 3spd it shall stay!
 
In all fairness, the $3300 Art was talking about was for a modified 200-4R and converter to live behind a strong 360. It also included all other mods (cooler lines, crossmember, etc.) and labor. The only thing it didn't include was a new driveshaft as stated.
 
Where do you come up with
need to cut the car up for OD.
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the 518 needs the crossmember mount dropped, so you need to cut the trans x and lower the mount, and need the body crossmember slightly notched..or actually shaved to half the thickness and then weld the top back onto the section attached to the floor...worst case scenario some A bodies need a hammer to smack the floor a little at just before the body cross...not all of them....

I really don't know how you see that as cutting the car up..


Even contemplating a gm trans vs the 518 switch is really insane when you think about it....

Just sit down, relax, and think about what it is you are doing...
 
well when i hear people say the trans hump needs "major surgery" for the 518, i assume it needs to be cut and widend. im not very mechanically inclined so pardon my ignorance here.
 
I think the people that say that have no clue, and sound like gm people..

Major surgery would be you taking the seats and interior out cutting the floor and old trans tunnel out....

When in reality you are dropping the trans mount lower in the trans cross member and shaving the body cross member..


EITHER way... just think about exactly what needs to be done for ANY gm trans to work...

Flex plate, bell housing or adapter, making SURE it is in line (or just gonna throw it in there)... linkage, kick down, vacuum, cooler lines... driveshaft....

Sounds insane now doesn't it...

The easier way out is usually the insane way...

Might as well drop in a ls with the trans.......


If you go that far might as well just get a camaro....

.
 
Supershafts said:
I think the people that say that have no clue, and sound like gm people..

Major surgery would be you taking the seats and interior out cutting the floor and old trans tunnel out....

When in reality you are dropping the trans mount lower in the trans cross member and shaving the body cross member..


EITHER way... just think about exactly what needs to be done for ANY gm trans to work...

Flex plate, bell housing or adapter, making SURE it is in line (or just gonna throw it in there)... linkage, kick down, vacuum, cooler lines... driveshaft....

Sounds insane now doesn't it...

The easier way out is usually the insane way...

Might as well drop in a ls with the trans.......


If you go that far might as well just get a camaro....

.
Click to expand...

Way to be condescending.
 
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