2004r into C3
Thread Starter
4th Gear
Joined: Dec 2009
Posts: 4
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2004r into C3
I'm restoring a '80 C3, and just picked up a 2004r to go in it. Originally it had a TH350.
It's my understanding that to mount up, the only different part I'll need is a crossmember for a TH400, and the 2004r will bolt right to it. Is this correct?
It's my understanding that to mount up, the only different part I'll need is a crossmember for a TH400, and the 2004r will bolt right to it. Is this correct?
Racer
Joined: Apr 2006
Posts: 322
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From: Rockford MI
I just did the same conversion in a 78. All i needed to do was unbolt a bracket off of the TH350 crossmember the the 200/4R bolted right to the stock crossmember. I did have some issues with the exhaust system fitting though. Had to take it to a muffler shop that had a bender because the pan on the 200 is wider. Its a great conversion though, you will really like it, makes the car great on the e-way.
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
No you do not change the driveshaft length when replacing a -400 with a 200-4R.. All you change is the 200-4R yoke to TH350 yoke and the front u-joint. It then bolts right in...
I am pretty sure the driveshaft must be shortened for a TH400 to a 700R4..
I am pretty sure the driveshaft must be shortened for a TH400 to a 700R4..
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Safety Car
Joined: Mar 2009
Posts: 3,558
Likes: 4
From: Oakland California
So the 200R4 is the same length as the TH350? Does this mean I can drop in a 200r4 into my 78 Camaro without shortening the driveshaft? I would really like an overdrive transmission in my daily drive Z28.
Pro
Joined: Jul 2005
Posts: 517
Likes: 7
From: Peoria IL
The crossmember is different for a TH400 than for a TH350/2004r, but it might not take much to make it work.
Pro
Joined: Jul 2005
Posts: 517
Likes: 7
From: Peoria IL
Yep, it's a hot swap. Check out the posts over on NastyZ28.com. That swap is done all the time.
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
And the crossmember , though maybe different, requires NO WORK when swapping out the TH400 for the 200-4R...bolts right in...
Pro
Joined: Jul 2001
Posts: 704
Likes: 10
From: Blairsville Ga
Dang, seems like for no more the 1500 bucks and very little work you could get an overdrive transmission. I would think an OD would greatly improve the drivability and the performance of our cars. Sorry darefugee to get of the subject.
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Burning Brakes
Joined: Aug 2006
Posts: 1,155
Likes: 0
From: San Diego California
Swapping the Bowtie Overdrives 200 4R, stage 2, in place of the TH350, was one of the BEST modifications I did on the '80. Fast and firm shifts, and .67 overdrive. 2200 RPM at 70MPH.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
13 year ago I did a 700 swap into my '72 350 muncie shark, had to shorten the drive shaft, went to a 200 4r as a much better suited to the car as the 336 diffy made the 700 first gear almost useless, and the 200 holds overdrive at WOT also where the 700 refused to do that....
not only that but the 200 is some 50 lbs lighter then the 700, and the pan is narrower,....
not only that but the 200 is some 50 lbs lighter then the 700, and the pan is narrower,....
Pro
Joined: Apr 2007
Posts: 736
Likes: 1
From: Chester VA
BTW, those of you that mentioned changing the yoke, did you change to a stock style yoke with u joint straps, or did you go to a snap ring type? Or does it even matter? I'm finding the snap ring type are easier to find. Doing this conversion now, thanks.