Guest Jeff 72 Posted July 23, 2007 Posted July 23, 2007 How much can a stock 350 turbo take with a mild shift kit? I'm not looking to drag race, but get good launches from the stoplight. I am going to run a TCI break-away converter. Motor is going to make around 375 to 400 hp. Torgue will be around 400 also. Quote
Guest Jeff 72 Posted July 23, 2007 Posted July 23, 2007 Am I going to scatter pieces of this tranny when I step on it with this current hp and torque figures? Quote
Guest 72yellowmc Posted July 23, 2007 Posted July 23, 2007 No..... you should be fine. I've had mine for years and I've done a lot of drag racing over the years, but only legal drag racing.... Quote
Heckeng Posted July 23, 2007 Posted July 23, 2007 You'll be fine. Especially on street tires. They will slip before you have any transmission problems unless your tranny is on it's last leg already! I also have run a 350 behind my 454. I usually rebuilt it every 3-5 years, just to be sure, and they have always looked perfect inside with the exception of one sprag race that I'd broken. I would estimate my hp around 450 and torque around 550 Quote
Guest Jeff 72 Posted July 24, 2007 Posted July 24, 2007 Awesome! Thanks for the input. I'm going to be a new tranny pan on it with a drain and bolt it up. Quote
Heckeng Posted July 24, 2007 Posted July 24, 2007 If you ever rebuild it, definitely put in a hardened intermediate sprag race, it's not expensive, and it's the most common part that breaks. Quote
big gear head Posted August 3, 2007 Posted August 3, 2007 Just busted 2nd gear with 470 torque and 430 HP and street tires shifting at 6000. Quote
Cali4nia Monte Posted August 4, 2007 Posted August 4, 2007 Well I don't know about stock TH350s but B & M said our 377hp 385trq motor was too much for their TH350, we went through a few of them. I don't remember what was wrong with the first it was actually DOA, but the second one they gave us we broke the second gear spag in less than a week. Then the 3rd one we upgraded to a TH400...and it was DOA! Lesson learned>>>DON'T BUY B&M TRANSMISSIONS! Jaylene Quote
Heckeng Posted August 4, 2007 Posted August 4, 2007 That is about the worst luck of anybody I've heard of Jaylene! That WILL keep me from getting a B&M transmission! Quote
big gear head Posted August 5, 2007 Posted August 5, 2007 Yep, second gear roller clutch. It's being replaced with a dog leg sprag. Quote
Heckeng Posted August 5, 2007 Posted August 5, 2007 Interesting. That is the weak spot though! If you put a 350 back in it, get a hardened intermediate race at least, or you can get a 36 element sprag/drum assy from somebody like ATI. I think it costs around $250 and dramatically increases the strength of the tranny. How'd the rest of the transmission look? I still run the stock roller clutch, but a hardened race. I have broken one of the hardened races too though. Quote
big gear head Posted August 5, 2007 Posted August 5, 2007 Yea, this will be the 36 eliment sprag, like the heavy duty TH400 piece. The transmission is still together, but there isn't much doubt about what went wrong. This was a customer's '70 Chevy truck with a 383. I built the rear end, not the transmission. I was test driving it when it broke. This isn't the first time that this has happened to me. I work on the rear end and then break the transmission. At least the rear end is good. Quote
420ponies Posted August 17, 2007 Posted August 17, 2007 Weakest link will break every time. can't tell you how many times fixing rear gears (Clutches carriers etc.) and wham ! out goes the tranny.Customer doesn't realize when this happens its just the weakest link syndrome. Quote
monte0 Posted September 1, 2007 Posted September 1, 2007 I had a T350 behind my big block for about 2 months before it went on me. Ended up striping/cracking the spline on the cluch hub were the input shaft goes in. Love the T350's but they have limitations. Quote
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