700R4 vs.. 2004R?

[SSedan64]

The 2004R was produced from 1980-1990 & came in Cadillac, Caprice, MonteCarlo, Regal, GrandPrix, Cutlass, B,C,D & G-body cars.
The best 2004R Trans came in Buick GN/T-Type code BQ & BR, SS MonteCarlo code CQ & CZ, Hurst Olds/442 code OZ & KZ and very rare 89 TTA/TurboTransAm code TA. These have the best ValveBody, Servo & Governor + Larger Boost Valves & PR spring in the pump.
The best site for 2004R Info is Turbobuick.com/forum, they're running these trans in 9.0sec 1/4mi cars.
The 700R4/4L60 was produced from 82-93. Then the 4L60E.
Most builders don't recommend the 700R4 for over 500HP. Neither trans should be used in 4th gear for towing unless the frictions have been extensively upgraded. Both trans TCC/TorqueConverterClutch can be locked up in 2nd, 3rd & 4th gears. Just depends on wiring.
82-early 84 700R4 had 27 Spline Input, 27 Spline Output.
Late 84-93 700R4 had 30 Spline Input, 27 Spline Output.
All 2004R had 27 Spline Input, 27 Spline Output .
87-93 700R4 have the auxillary Valvebody added. The newer the better, More factory internal upgrades= Vbody, Pump, Planetaries, 3-4 clutches etc..
2004R is same length as TH200/200C, TH350, Short PowerGlide. Same 27 Spline Output Shaft, so same Driveshaft.
TV cable adjustment on 2004R & 700R4 is critical. If not correct it can burn up a trans in a matter of a few minutes or miles. TCI makes a ConstantPressure Vbody for the 2004R & 700R4 that doesn't rely on the TV cable for line pressure calibration but, can increase pump wear and cause very firm part throttle shifts. This can be annoying.
Trans---- 1st---- 2nd-- 3rd--- 4th--- Reverse-------------------------
TH2004R- 2.74-- 1.57-- 1.00-- 0.67-- 2.06----------------------------
TH700R4- 3.06-- 1.62-- 1.00-- 0.70-- 2.29----------------------------
Most 2004R's have the Unibell= fits BOP/BuickOldsPontiac & Chevy.
The 700R4 fits Chevy only.
Need to know more on the 2004R just ask, they're one of my favorites.
Todd