200-4R transmission

I am restifying a 1970 Z28 and recently picked up a 200-4R transmission. Is there any modifications needed to have it work properly in this car. I have
noticed a small 2 prong plug in on one side and want to know what it connects to. Will my original speedometer work with this tranny or will I need some sort of modification. It came out of a 1985 Olds Cultass Supreme with a 305. Any info will be greatly appreciated Thankyou
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You can install this trans with a lot of modifications.Must be what you want because its a lot of work.You need to make sure the trans case will bolt up to the engine you are using.If it is a chevy engine the trans case must have a multi bolt pattern on the bell housing.200 4R's always were meant for olds or buick engine if it has only one bolt pattern on bell hsg. If it has only 6 holes in bell hsg. plus 2 dowel pin holes it is olds/buick style. The chev style will have I think 8 holes plus 2 dowel holes. But basically if its olds/buick style it also has like a V in the top of bell housing, chev style kinda peaks up on top of bell hsg. . You will have to change the length of the driveshaft, just get measurement when trans is installed and any machine shop can change the length of it.You will have to relocate the cross member.Most importantly you have to make sure the TV cable is made to work properly.This is what controls the pressure in the trans.Depending on what you are using for a carb. tells you what to do with the TV cable.If it is a Qjet carb you can go to auto wreckers and find a car that has a 200 4R in it and get the carb base plate off it and TV cable bracket and Tv cable.Install base plate on your carb and the new bracket and cable, have transmission pro adjust it for you.If you are using aftermarket carb like holley or something you can buy kits from a company called bowtie overdrives from I think california, can find them on the net.They sell TV cable kits for overdrives with any carb set up.Your speedo will hook up to the speedo hsg in trans but gear ratio for proper speed reading is important.A web site called bowling and grippo helps you pick speedo gears needed.You have to remove outer speedo hsg from trans and look into trans and count speedo gear on output shaft.The bowling and grippo web site needs to know tooth count on at least one gear to do the figures.If you find it hard to count the teeth on the inner gear you can also look what color the gear is and go to a transmission shop and they can look in parts book and tell you the tooth count.The reason I say to count the inner gear is because if you can't get proper ratio with the inner gear you have then you have to completely tear down the transmission to change the inner speedo gear.The last thing is that plug on the side of trans is for torque converter lock up control.It has to be hooked up as well cause if its not then it creates lots of heat and not good for transmission.You can also go to auto wreckers and get a vacuum switch and wiring to hook up the lock up control.You would probably be better off to go to a performance shop and buy a lock up control kit for your application.Performance shops will carry brands like JET , which is very good for things like this. I hope I didn't miss any steps , but there is so many things involved to do this.But, it can be done. Good luck if you go ahead with it.
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Wow Lots to look into. Thanks for the reply

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