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TH350 to 2004r/700R4 Overdrive swap

Stuff like brakes, frame, springs/shocks, tranny's, etc. etc.
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79loserbluebu
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TH350 to 2004r/700R4 Overdrive swap

Postby 79loserbluebu on Fri Jun 11, 2010 1:04 am

What all is needed? I understand the crossmember and driveshaft depend on what vehicle, but other than that what can you still use? I've got a shift cable from a 2004r car, and I know the shifter bolts into the same exact spot. What about trans lines? Also I see places offering the switch for the TC lockup. I bought a set of 3.23 gears to put in my TH350 car with a 3.73 rear, just to keep it alot more streetable until I can save up for an overdrive swap.
79' Malibu
LQ4/4L60E/8.5
11 second full weight street car

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DrRansom442
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby DrRansom442 on Sun Jun 20, 2010 11:19 pm

need TV cable and the right brackets for the trans and intake, not sure if the cooler lines match up - I'd just bend new ones. Depending on the year of car you may need a frame extension piece on the driver's side to hook the 200-4r crossmember (have no clue how a 700-r4 member bolts-in, but I am sure the company you buy it from can tell you). 200-4r/TH350 will use the same driveshaft (this usually only changes with differentials 7.5 vs 8.5 - the 700 is another story - you will probably have to have one cut). I used the th350 dipstick and linkages with a new shifter cable. New transmission mount and I do believe you are ready to go ... atleast if there is anything else in the swap - I forgot.
3 time A/G-body owner
86 Cutlass Salon 307/200-4r (salvaged May 04)
87 Cutlass Supreme 307/200-4r (stolen Oct 04)
81 Cutlass Calais 260/350 (purchased Nov 04)
never thought I'd say "I miss the power of a 307"
Calais tranplanted a Olds 350/200-4r

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79loserbluebu
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby 79loserbluebu on Sun Jun 20, 2010 11:27 pm

Sweet thanks a bunch for the info. That does make sence about the driveshaft seeing from going to an 8.5" I needed a shorter one. That's good news. Do you have any more info on the places to get the brackets and TV cable? I'd like to read up on it a bit more before I make any bold decisions.
79' Malibu
LQ4/4L60E/8.5
11 second full weight street car

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DrRansom442
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby DrRansom442 on Mon Jun 21, 2010 2:41 am

79loserbluebu wrote:Sweet thanks a bunch for the info. That does make sence about the driveshaft seeing from going to an 8.5" I needed a shorter one. That's good news. Do you have any more info on the places to get the brackets and TV cable? I'd like to read up on it a bit more before I make any bold decisions.


I got both brackets from summit and the cable from the local advanced auto but a junkyard would do for the brackets too cable you better buy new. It's that crucial.
3 time A/G-body owner
86 Cutlass Salon 307/200-4r (salvaged May 04)
87 Cutlass Supreme 307/200-4r (stolen Oct 04)
81 Cutlass Calais 260/350 (purchased Nov 04)
never thought I'd say "I miss the power of a 307"
Calais tranplanted a Olds 350/200-4r

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Phoenyx
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby Phoenyx on Mon Jun 21, 2010 10:48 am

I vote for the 200 over the 700.
1980 4-door Malibu Classic
-355 10.5:1, worked over L82 Corvette 202 heads, 274 Energizer hydraulic cam, MSD Streetfire distributor and wires, Edelbrock 625?cfm carb (temporary), shorty headers, 2 1/2" (or maybe even 2") full duels (2 1/2" to come this summer)
-B&M TH350 with 2400 stall
-7.5 with 4.11 limited slip, rebuild drum to drum with support cover
-15" steelies with 24 1/5" tires
-Edelbrock boxed lowers, double adjustable uppers, anti-hop bars, and tubular braces
-jounce bars, GP bar (not installed yet), rad support braces, fender to support braces

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Re: TH350 to 2004r/700R4 Overdrive swap

Postby CamaroAdam73 on Mon Jun 21, 2010 10:52 am

Start here, http://www.transmissioncenter.org/700r4 ... Converters

They make a universal fit G-body crossmember for the 700R4, and all of the TV cable brackets, correctors and other things you'll need.

I spent about 850$ in parts from that website for my 700R4 to fit better than factory in my 88 MCSS.

Also, go with the 700R4 over the 200R4, allot better for the money.
1988 Monte Carlo SS, Olds 403 Built, Th350, stock 7.5 rear 3.73

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Re: TH350 to 2004r/700R4 Overdrive swap

Postby SScamino on Mon Jun 21, 2010 11:31 am

I say go for the 200, both are very weak stock, but the first few years of the 700 sucked. plus there is a huge drop off in gears from 1st to second, 200s can be just as strong, and are cheaper, you can use the stock driveshaft all you need is a new crossmember! 200s have a better a better overdrive along with the better gear spread... you would be insane to spend more money on a 700 then have to cut a new driveshaft and then get worse gas mileage as compared to a 200.
1981 El Camino SS. 355 cubic inches of small block Forged bottom end, slightly worked Vortecs, xe274 cam, Built Dr. Speeds TH350 with a 2800 stall and 3.73s
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Phoenyx
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby Phoenyx on Mon Jun 21, 2010 1:20 pm

Gear ratios in a 700s are meant for a truck. 200 will have a much better feel. Plus 200 is a much easier install.
1980 4-door Malibu Classic
-355 10.5:1, worked over L82 Corvette 202 heads, 274 Energizer hydraulic cam, MSD Streetfire distributor and wires, Edelbrock 625?cfm carb (temporary), shorty headers, 2 1/2" (or maybe even 2") full duels (2 1/2" to come this summer)
-B&M TH350 with 2400 stall
-7.5 with 4.11 limited slip, rebuild drum to drum with support cover
-15" steelies with 24 1/5" tires
-Edelbrock boxed lowers, double adjustable uppers, anti-hop bars, and tubular braces
-jounce bars, GP bar (not installed yet), rad support braces, fender to support braces

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DrRansom442
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby DrRansom442 on Mon Jun 21, 2010 4:34 pm

I will also throw my support behind the 200-4r. When built right, they can handle just about any power you can throw at them. 700-r4s (in my opinion) are far better suited for trucks rather than cars. The ease of install and less modifications/fabrication to your car .... means if you ever need to switch back - that too is less work.
3 time A/G-body owner
86 Cutlass Salon 307/200-4r (salvaged May 04)
87 Cutlass Supreme 307/200-4r (stolen Oct 04)
81 Cutlass Calais 260/350 (purchased Nov 04)
never thought I'd say "I miss the power of a 307"
Calais tranplanted a Olds 350/200-4r

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86 regal
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby 86 regal on Mon Jun 21, 2010 4:40 pm

Awsome info! i've had a 700R4 in the back of my mind for a while!
86 Buick Regal Limited 454, TH400, 9" with 3:70 gears and full spool,
84 Monte Carlo Project...

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JBreu
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby JBreu on Mon Jun 21, 2010 4:49 pm

I just went from a th-400 and went to the 700-r4 and have no regrets at all.........You can use the stock crossmember as lond as you get a tail shaft from a late 80's Caprice, caddy or buick roadmaster 700-r4...... Here is a link to that :http://www.chevyhiperformance.com/techarticles/46278_automatic_transmission_overdrive_install/index.html. YOu will need geometry corrector brackets and a TV cable bracket as well...............Available from Jegs or Summit........Both the 200 and 700 are great tranny's if built right.......I was able to throw 4.10 gears in my car and still cruise the expressways at a low rpm :) As far as the driveshaft.....you will need 49.5" from center of U-Joing to center of U-Joint--that's with a 7.5 rear or 12 bolt.......and take off another inch if your going to the 8.5 rear. Hope this helps...
1984 Monte Carlo with sbc 388 stroker ( dynoed 514hp) 700-r4 , 12 Bolt w/4:10
Old Chevy's Don't Die, They just get faster!
Best ET to date : 12.20 @110 Mph All Motor
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DrRansom442
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Re: TH350 to 2004r/700R4 Overdrive swap

Postby DrRansom442 on Wed Jun 23, 2010 9:03 am

wasn't really trying to discourage the use of the 700-r4 .... if one has a "good" 700-r4 just laying around and it's going into a Chevy powerred car (I don't like the concept of adapter plates) - use it. But all things considerred comparing the 2 and considerring swapping into a A/G body car (which never had the 700) - I think the 200-4r has it hands down.
3 time A/G-body owner
86 Cutlass Salon 307/200-4r (salvaged May 04)
87 Cutlass Supreme 307/200-4r (stolen Oct 04)
81 Cutlass Calais 260/350 (purchased Nov 04)
never thought I'd say "I miss the power of a 307"
Calais tranplanted a Olds 350/200-4r


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