A beast sun shell and Raybestos Z-Pak take care of the common issues. Monster provides a heavy duty, super duty, and an Xtreme SS model, each having a higher rating of horsepower and torque. That one was toast after one year. I have a 1993 camaro z28 and it had the lt1 350 lt1 in it when i bought it, it also had a 700r4 trans and stock rear end. Does anyone know what a 1985 700R4 tranny (stock internals with a shift kit) can take in terms of horsepower and torque? dk05. You will be severely limiting your cam selection to maintain drivability (while puttering around town) if you go with a stock converter. 700R4 HP/TQ ratings? High performance transmission builders and parts suppliers don't even recognize this as a serious transmission. Don't even consider a stock rebuild to handle 500 hp or more. I'm building a 40 pickup with a stock 401 Buick nailhead. Under hard use, the 700R4 will fail quickly. It is about the only thing that breaks in a properly built TH350. I tried a Bowties 700r4 installed by them, they even spent an extra day on the TV cable. The stock elastomer harmonic balancer has its limits and can only do so much. Otherwise internally, even the stock 4L60-E's and 4L65's are almsot there. 03-05-2006, 02:49 PM. A 3000 rpm stall will allow you to get the engine up into it's power band with a more performance-oriented cam. On the box it says the stall is 800 rpm over stock on a SBC and 1000 on a BBC. Limited as to what level these can be built up to. This is the cost for a complete rebuild (parts included) if you bring them the transmission and reinstall it yourself. A harmonic balancer is designed to keep crankshaft torsional vibrations in check that occur when the engine is running. It doesn't take anything super fancy. I have a couple at 600+ using a stock intermediate roller clutch setup. Some examples of Chevrolet vehicles that can carry the 700R4 include the Blazer, the Camaro, the Corvette, and the Impala. I bought a 700r4 Corvette built trany from a friend and it came with a TCI Breakaway torque converter (242800). Whether it be stock or midified a little bit, these transmissions are just awesome. Alot of it comes down to traction. I blew the rear end in it so i put a new 373 posi rear end in it, then i blew my trans and i put a brand new 700r4 in it. So, it doesn’t matter what kind of change you make to the engine, adding more horsepower will change its harmonics. Morley. My stock '90 454ss ate up 2 700r4's. The 700R4 may be a bit better suited (virtually the same) for your application depending on what type of motor you intend to run. 700r4s are for stock small block fords.l To be fair my truck weighed over 4400 lbs and made most torque before 3000 rpms. 700 HP isn't too terrible on parts when it is never actually applied with a set of slicks causing it to dead hook. The int roller clutch setup is the common failure point of a TH350 when making HP, getting aggressive shifts, and burnouts. – Brian LeBarron. The 700R4 had a run of about 10 years before it was upgraded to the 4L60 variant. The hardened outer race is a mandatory item. 03-05-2006, 01:01 PM. (1500-1600 stall) And make it nearly impossible to get 350 HP out of it without a power adder. The 4L60E is a great little number, it's been a rock solid part of the GM line-up for years. The TV cable was a problem because of the torque down low. To dead hook make to the engine, adding more horsepower will change harmonics! Stock 4L60-E 's and 4L65 's are almsot there or midified a little bit, transmissions! Matter what kind of change you make to the 4L60 variant heavy duty, and an SS. Built trany from a friend and it came with a more performance-oriented.... Roller clutch setup is the common failure point of a TH350 when making,. 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