I know beaten to death 700r4 converter

[djfxall]

Ok I want to be realistic here I have a 71 chevelle 355 9.5 to 1 compression afr 195 street heads going to be changing the cam soon to a solid howards roller the smallest they make for sbc. Figuring hp around 425 450. I have 3.73 gears and 26 inch tires. Have a 2000 stall that came with the trans from mad dog transmission back when they were outlaw trans. I recently lost 2/4 band so I am gonna replace it so the trannywill be out so I am gonna add some goodies like a new reverse manual valve body with engine braking. What stall and what converter this is a daily driver build that is more protouring then drag. Tci says dont run a converter thats higher then your highway rpms. Patc says run a 3200 no problem its streetable talking about the mega raptor 1. Confused on this one also torque multiplication. So many variables here any help would be nice. Will be running lock up.

[1966longroof]

I have a sbc 383 c.i./430hp/448 ft.lbs. torq. (pump gas) that is a true daily driver. Camshaft is a small Comp Roller 520 lift and dur. @.050 is 230. Also have a 700R4. With 3.70 gears in a 9inch ford. I have been running a B&M 2400 torque converter for years. As I said, the car is our everyday family car, also used to bracket race it every weekend up until last year. Now for playing, I turn left and right. My .02 cents worth...stay in the low to mid 2000 rpm range. But check with the experts at B&M, TCI, FTI, Hughes, etc..... Additionally, remember to use a quality trans cooler.

[Steve Chryssos]

With 3600lbs, a 3.73 gear, 26" tires and a carburetor, we would recommend a 2400-2500 stall converter. Many folks here on P-T.com run a similar combination and swear by our converters. 3200 rpm is ridiculous for a pro-touring car. For a Pro Streeter that is nothing more than a glorified burnout machine, 3200 rpm stall is fine, but for a pro-touring car? Remember, the outside world has little or no concept about pro-touring.

I can do a 12" Lock Up 2400 stall for $475 or a 10" Lock up 2400 stall billet converter for $750 with a lifetime warranty. Either way, you'll love it.

[djfxall]

What is the advantage of the 10" over the 12"

[Mr_Roboto]

What is the advantage of the 10" over the 12"

I'd probably guess rotating mass, maybe the stator design. a 12" at 2500 is likely a stock style restalled and possibly some internal parts.

[Steve Chryssos]

Correct on both counts. Both converters are super efficient and tight feeling under part throttle and transient throttle operation. the 10" will accelerate more quickly when you stand on the gas. In fact it's safe to say that the 10" will scream like a much looser converter, thanks to a really trick custom stator as well as the smaller diameter. The 12" will increase rpm more gradually. The 10" also has a flywheel-like billet front cover that works in conjunction with an oversized lock up clutch. The 12", on the other hand, has a standard size lock up clutch and a stamped front cover.

If you move up to a 4L60E (early 1-piece case) you'll be able to maintain either converter, though the 10" will allow greater computer control over lock up because of the oversized disc.