TH350 Knowledge

[jiho]

I know "the internet says" 350C is junk, but why?

Supposedly the input shaft is weaker. Smaller diameter, IIRC, for the lockup apparatus?

 

[olds307 and 403]

As said, the unique parts make it slightly weaker. If you have the TH250C, you have a spare input and pump. Most I have seen are the 250C, the BOP short tail is supposedly rare. The 350C trans I have seen most are the long tail sbc versions from trucks. The torque converter is also unique but high stall units are available, I still have a 2500 stall sitting around. I don't buy that they would be any amount slower for acceleration, with the same trans gearing and stall. I think most builders don't know the 350C so they avoid them. I might be hard to find the unique lock up solenoid, pump parts and input. My only failures with the TH250C/350C had nothing to do with the weaker input. I cooked first gear quick in my TH250C behind my Olds 403, it was a high mileage unit. The 2500 stall flashed right where it should at the track with slicks but was slow as sh*t with no first gear. The 300 rpm drop is nice especially if your gearing is on the high number side.

 

[Clutch]

Just don't use the guy that built mine you may never see it again LoL

 

[monte olrac]

Sounds like you should find another transmission builder, a good one can convert the TH350C to a regular Th350. I have a built TH350C and I didn't use the lock up function. The main difference you'll have to deal with is converter selection and higher converter cost, I have an acc boss hog 2800-3200 and it cost about 450 bucks. There's not a huge selection. Also if you crack the bellhousing like I did you can't use a jw ultrabell because the converter depth is different so you'll be stuck finding a different case. But they can be built to handle abuse if you go to a reputable builder

 

[TURNA]

Sounds like you should find another transmission builder, a good one can convert the TH350C to a regular Th350. I have a built TH350C and I didn't use the lock up function. The main difference you'll have to deal with is converter selection and higher converter cost, I have an acc boss hog 2800-3200 and it cost about 450 bucks. There's not a huge selection. Also if you crack the bellhousing like I did you can't use a jw ultrabell because the converter depth is different so you'll be stuck finding a different case. But they can be built to handle abuse if you go to a reputable builder

Sound like a huge amount of wasted money since you did not use the lock up.