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Discussion Starter · #1 ·
I bought what I thought is a th350 it came out of a Chevy p20 van I don't know year it measures 31 1/2 long the transmission I pulled out is a metric 200 measures 28 1/2
Don't know what I should do now seems like it should bolt up but do I need another driveshaft? Thank you
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This might help. The 350 comes with various length tails that can affect your driveshaft length needs. In some cases it might be cheaper/easier to switch tails than shafts. You will also want to check the mount placement to see if you need to move the crossmember.
 

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There are also some things to check with the flywheel at the front on some combinations of engines and transmissions. This may or may not apply to your situation but its better to solve for this now rather than later.

What engine are you putting with this transmission?

Yes, very likely you will need a different driveshaft and possible a new transmission cross member.

Rick
 

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Discussion Starter · #4 ·
Oh ty do much! It has a 305 in it. I'm doing my homework so it goes smoothly. I'm going to replace flywheel and maybe better quality starter. I was seriously considering ordering a new transmission from jegs. I'm going to keep the car I paid 250 for this used transmission I just don't want to waste my time.
 

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I would not order anything from anybody until you can list out your questions to a transmission specialist and note more about your engine. For example:

A carburetor-equipped 305 or fuel injected? Are you going to pick an electronic transmission?

Will the transmission you pick (a 700-R4 or a 200-4R) require a throttle valve? Get this wrong and your transmission will be trashed on a drive across town.

All I'm saying here is to proceed slowly to not waste money. Ask people at the reputable transmission shops close to you. In fact, I don't recommend a mail order transmission because of the hassle of any potential warranty claim.

Rick
 

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In fact, I don't recommend a mail order transmission because of the hassle of any potential warranty claim.

Rick
ask one of our members about his Monster Transmission and subsequent claims. it's quite the novel
 

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Something else? The flex plate on my old 200 had the small bolt pattern for the old torque converter. Whatever you do, make sure you get a Torque converter that matches the mount holes on your stock flex plate. Or you may be purchasing and installing a new one. Worse case is installing your new tranny and torque converter finding out the mounting holes don't line up. Then you'll have to pull the tranny and install a correct flex plate. Note: Some flex plates have the smaller and larger diameter bolt hole patterns provided! Some don't! Just be aware!

When I did my engine and transmission swap. I had to change out my flex plate because newer engines required the use of a balanced flex plate. Again, I had to make sure the new balanced flex plate torque converter mounting holes matched each other.
 

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Something else about flex plates. There is a 153 tooth and a 168 tooth. if you do end up replacing the flex plate? Keep in mind the diameter of your original flex plate? Your starter most likely won't work if your replacement flex plate is a different diameter than the one you originally had with your 200 C tranny?

Flex plates used on engines from 1986 on require the use of a balanced flex plate. Though I believe you said your Elky was an 85. The big issue is. If you replace your tranny with anything different than what you now have? Just make sure the torque converter will bolt up to your original flex plate. All issues will be solved.

Not trying to be confusing Just trying to save you time and money!

Good Luck
 

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Discussion Starter · #14 ·
Ok so I'm a full time CNA and attending classes so I have been so busy... so I have learned quite a bit. The transmission is in, it went pretty well. Now I had a few issues going from a th200 to a th350 I bought a th350 with the long tail not knowing the short tail would of been a little better for me. So I had the driveshaft cut by 3inches and I'm going to install this weekend. They actually installed the ujoints for me too. I ordered the 3 converter nut and bolts from Amazon last night as this was different also. I ordered the detent cable also. The transmission tube is different so I'm trying to figure out which one to order. And the speedometer bullet bullet I'm trying to replace also. I have this weekend off so hopefully I make some progress. Thank you for all the advice it really helped!
 

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Remember that u coul easil Chang the tail to a shorter one,which would have solved your drive shaft issue, as well as transmission mount support most likely. What do you mean by transmission tube? The dipstick? Or do you mean the tube looking support that is the transmission support? As far as the bullet goes that's an easy solve, you can either order the one that you need to get your Speedo as close as possible, or an adapter for it. Both are simple and require little research and they are cheap. Detent cable is extremely important if it is not adjusted properly you could ruin the transmission in a couple blocks of driving it, especially because it is a used one. I'm very envious of you that you are going from the problematic and very slushy like 200C transmission to the 350. I'm pretty sure you said you had the 200 C. Anyways if the new transmission is one gear more than the old one you will also have to adjust the parking selector gauge. Lots of tweaks. Which is why most people will stay with the same trans oh, and if they do go for an upgrade like the 350 they change the tail rather than the drive shaft. Please keep us updated
 

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Remember all of this could be in vain as the 350 might take a dive shortly after swapping. Also most people prob told you,don't change trans fluid if its ok /not burnt. If trans works out you can do partial change,1/4 most. So like if you want to change the transmission filter in the future, you can do so but reuse the trans fluid if it is in good condition, not burnt, Etc. Just run it through a filter before putting it back in, like a rag and a funnel. Changing 100% of the fluid on an old chance that is working is a sure way to blow all the seals three to six months with the new fluid
 
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