WIll a 700R4 bolt directly in place of the TH350 in a 82 Z28. I realize that the shifter indicator will need to be swaped with one from an overdrive car, but will the crossmember work?

What else should I have to look for?

 

I'm no expert, but I'm pretty sure the 700's crossmember won't bolt up on our '82s. The holes for our xmemebers are not in the right spot. I believe Spohn sells a xmember that will make the swap a bolt in. You will also need the driveshaft for the 700 since it will be a different length than the th-200c three speeds that came stock in '82. I don't know about the TV cable issues either. And on the torque converter lockup maybe it works with the 200c's hook up? Not sure.

Best of luck with it,

 

I recently made the swap.
(I'm assuming you really have a 200C instead of a TH350)

A couple of members have suscessfully converted their 82' crossmembers to work with the 700r4.
It requires cutting, fabricating and welding.
Too much work for me..

I used the crossmember from my 87 GTA parts car.
The 2 rear holes of the GTA crossmember lined up with the front 2 holes in the sub-frame.
I had to drill the remaining 2 holes in the sub-frame and fish some washers and nuts inside.
That was fun!

My car has Cross-Fire and I was able to use the old 200c T-V cable. It had to be slightly re-routed since it is a little short, but worked out well. (I was wanting to use the original 700r4 cable but it was corroded and broke)
Not sure if carbed eng T-V cable will be long enough or not.

The 700r4 elec connector has 3 pins in the tranny plug.
The car side of plug has 2 pins. Not to worry though, just plug it in.
The extra pin is for the tranny to signal the computer it's in 4th gear. The 82 computer doesn't look for that.

You'll need a 700R4 driveshaft and torque arm. They're both too long.

I used the torque arm from the same 87 GTA, and it bolted up to the 82 rear end, no problem.

The shifter arm that the shift cable attaches to at the tranny had a smaller hole than my 200c. The bolt on the end of the cable wouldn't fit in the shifter arm hole.
I was able to swap the arm from my old 200c. It fit perfect.

I had to give the speedo cable (I have cruise control) a good tug to "extend it" back to where the 700r4 speedo drive is. Working well so far.

The 82 shifter will work temporarily, but I wouldn't advise using it for long.
I'm still using mine, but will change it out pretty soon.
If adjusted right, you can shift to "first" by pushing the button all the way in and pulling back on shifter and still get a good "park" engagement. (my GTA parts car shifter is a different animal and I was not able to use it)

Shift cable binds a little with the new bend in it, but not too bad.

Cooler lines pretty much hook right up, just a tiny tweak was needed on mine.

Finally, you'll need to rig up something for your catalytic converter rear hanger support. Yours won't bolt up anymore. I used the one from the parts car, but it wasn't quite right either.

The OD is SWEET though. Well worth the effort!

 

Thanks for the replies. I was able to find a complete package with tranny,engine,harness, and computer. All will be changed durring the conversion.

Is there a prefered driveshaft to use?
Is it that the origional driveshaft(82) is longer than needed, and can a shop cut it down?

Would it be advisable to change to a aftermarket torque arm now, or can used origional ones be had for a good price?

If I change to an aftermarket torque arm, what are the benifits over the origional.

As far as the exhause goes, it is all gone, and I will not have a new setup installed until the drivetrain is complete, then it is the problem for the muffler shop.

What is the best way to identify a 200 vrs a 350 tranny? I think I remember that the TH350 has a Texas shape to the pan?

About the shifter, any good aftermarket, or what car should I look for one in at the salvage yards?

 

ZZ28ZZ, I think you have the crossmember/frame holes backwards. The front holes in the TH700 crossmember match the rear holes in the '82 frame. You need to match drill the rear crossmember holes.

A shop can cut your driveshaft to the correct length. The advantage will be that it will be straight and balanced when they're done. The disadvantage is that it will be more expensive than a used TH700 driveshaft. An alternative is getting an aluminum driveshaft, as it is superior to both.

A Spohn torque arm will mount to the crossmember, which is better than the stock and most aftermarket TA's method because it takes the load off of the tranny mount. If you're considering one, the Spohn is a good choice, and doing it once is usually preferred to doing it more than once. Any aftermarket arm will flex less and be less of a whip than the factory arm, but you should be able to find a factory piece at a junkyard.

If you plan on using this at the strip, a rachet shifter is nice. Many use the MegaShifter (have one in the '57, haven't had a good excuse to get one in the Camaro yet), Hammer also used by some, or Quarter Stick. Otherwise, you should be able to find a junkyard TH700 shifter. Be sure to get the cable bracket that mounts to the tranny pan.

 

A THM400 has an oil pan shaped like texas. A THM350 has a square oil pan

 

Ur right Five7kid.
I had it backwards. At any rate, you'll be able to move the floor jack out from under the car.

 

5.0 10,

By the diagrams you show it is a TH350. But the oil pan had METRIC stamped into it, would that still be the TH350, or the 200? Not that I care about the tranny, I am just wondering about the cross member, but it sound like I will need a new one either way

Thanks

 

hey i thought the pan for the th350 tranny had the corner cut off on the passenger side and not the drivers side. becuz thats how mine is.

 

My 200C tranny had the word "METRIC" stamped into the oil pan.

 

quick question before i do this myself, does anything have to be done to the kickdown?

 

For information about converting the 82 shifter for use with the 700r4/4L60e go to my post where I just converted over to the 4L60e transmission. The shifter conversion is easy. You get to keep all of you cables etc. Check it out

4L60e/shifter conversion