I am replacing my PG with a TH350 haven't bought it yet.Do I want a lock-up converter or a non-lock up? I don't know the difference.I plan on running this behind my 210 hp 327 for about a year then upgrading to a 383.Any comments on what I should do?--thanks!

Hi, I'm not a transmision guru, but I'll see if I can answer this one for you. If you are just switching to a TH-350 you don't have to worry about it because TH-350's are all non-lockup. In the early 80's, I believe, GM came out with a TH-350-C that was a lock-up. This transmission was a pre-overdrive unit that when the converter was locked up, you were getting a 1:1 ratio, straight thru the trans. so to speak. I have never heard of anyone trying to retro-fit one of these into a different vehicle. Where you have to make a choice would be with an overdrive unit such as a 700R-4 or a 2004R. I have heard that a non-lockup overdrive transmissions can build up a lot of heat, which you don't want heat in an overdrive trans.

You can use a T-350 out of early 80's with a lock-up converter if you want. A friend of mine got one out of a 81 Corvette, and used a B&M
lock up kit, in his 69 Chevelle. The lock up kit was adjustable for the
lock-up.

I was going to have my PG rebuilt, till I found out what they wanted for a TH350 at Advance Auto.I asked if it came with the converter and he said yes we can get a lock up or a non lock up.I was then in over my head!Thanks I guess I will go with the non lock up.

I remember seeing (online article somewhere) that the input shaft on a th350-c was not as sturdy as the input shaft on a regular th350. For this reason, they did not recommend the th350-c for performance applications. More thoughts anyone?

I'm also curious if anyone out there is using a th350-c, and what their impressions are......