I need help with some figure out like just tell me dummy way of what I need please
it’s got the 305 engine with the th200c transmission that am going to swap the trans out with the TH350 but I’m having hard time figuring out the different splines and what the **** to do…
the stock is 26 spline but the th350 is 27?
doni just change the rear yoke or what?
explain to me cause I need help

 

350 and 200C have the same splines. Not sure where you're going with "rear yoke" and all that.

One of the 350 lengths is the same as the 200C. Can't recall after all these years butt one of the 3 is, although I'm pretty sure it's not the long one. If you get the right one (the same length as your slushbox), everything all just bolts up and works, including your drive shaft, except for the torque arm. You'll need to either find one of the brackets to support the stock TA that's been discontinued for about 25 yrs or so now, bearing in mind you ARE working on a car that's 43 yrs old this month; or get one of the aftermarket crossmember/TA setups that handles that all on its own.

 

I did the swap 25 yrs ago. The 350 bolts in. The stock shaft worked. The issue is the shift linkage being a little off and the torque arm mount. You could fab up a mount or just get a crossmember that has a torque arm mount on it (the better move). As far as the shifter, we got an adjustable cable and altered the mount a little. All in all it's pretty easy.

 

Thanks for the advice.


 

If I remember my transmission mechanic told me that the TH200c was junk.

 

They arent a th350 or 400 for sure but they can be built. I had one built for my Monte Carlo it held up and had a nice shift kit in it.

 

The 200C is junk. Its strongest weeeeekness is lack of any kind of decent center support. It was never made to handle more than about 200 ft-lbs of torque, and even that, only very gently applied.

Not at all the same as the 200-4R that came in MCs later on.

 

Less the Over-Drive Section, the THM200-4R is essentially Identical to the THM200/ THM200C.

They are horrible in Stock form...
But surprisingly have had excellent aftermarket support to allow for 1,000+ HP Builds.

 

I had a th200 in my 82 when I first got it. It had some kind of shift kit I think. It held up really well to the raging 145hp that car put for 136k miles.

seriously though, if it's a fairly stock early car a rebuilt th200 is probably fine. It wouldn't be my choice but it should work.

 

Which among the 200 and the 200C is for V-6 and V-8 (just curious)?...

 

I am not sure that I follow.

Are you asking if a particular THM200/ C is a better candidate for use with a V6 or V8, such as one from a particular model Vehicle?

If that is indeed what you are asking; No there are no "Performance" Variants akin to the Variants of the THM200-4R.

 

No, I am asking which one bolts to a V-6 and which one bolts to a V-8. I had one for a V-6 decades ago and was told it would not fit a V-8, so I got rid of it...

 

I recall finding a 200c in a 1984 G-body Regal with a 3.8 Buick in front of it,so probably Chevy,BOP and 60* versions .