Part-1: Solving rebuilt transmission problems..
1. Check the automatic transmission fluid level first..This test is obvious. The transmission has to be full of fluid. Low fluid causes slippage and damage.
2. Checking the radiator, cooler lines, fan clutch and cooling system out and being in sold shape. It is imperative that the cooling system performs to maximum capacity. The radiator cools the transmission too.
3. The automatic transmission cooling lines and the cooling portion of the radiator are flushed out using a hi-dollar transmission cooling system flushing machine or a nice product being sold that is in an aerosol can and hooks to the cooler line. It has a built in adapter for the cooler line and uses the proper cleaning agent to get the metal, brass and clutch material crud out of the cooling coils of the radiator and auxiliary cooler if so equipped..If not do it now, well worth installing one, especially if this is a hot-rod or commercial application. O.K. this is simply the most important procedure that has to be done before a rebuilt, or any fresh transmission can be installed. It would shock you to see how much crud builds up inside the transmission cooler portion of the radiator. Unbelievable amounts of contaminants build up in the coils and tiny holes inside this portion. New automatic transmission fluid is full of detergents, because automatic transmission fluid is not changed very often.
The instant warm or hot transmission fluid goes through a dirty or partly dirty transmission cooler, it melts away the crud build up. The crud goes right into your rebuilt transmission and sticks and or restricts the delicate movement of the valves in the the valve body. And the governor too, on non computerized T700-T4’s or the 4L60E.
3. Examine all linkages such as the T. V. cable for proper movement during the entire range of use age. The T.V. cable has to work smoothly, allowing the cable to slide back and forth smoothly. Or buy a new one. It may be why your transmission failed!
4. Adjusting the T.V. cable to specs. Then fine tuning it during the road test.
5. Hook up hydraulic gauge/s to transmission main line port and check pressures as per manual in R, 1st, 2nd, 3rd, O. D., N, RÂ and Park. Since automatic transmissions operate off of hydraulic pressure, meaning the ATF creates pressure by a pump assembly built into the transmission, we need to know what the main pressures are in the above gear ranges. The pressures in all ranges must match factory pressures or the pressure recommended by the upgrade kit company. If the pressure is off in one or all of the ranges, something is wrong…
6. Hook up scan tool for extra measure. This is not a computerized transmission, but what the heck, lets see if we have any codes. There is almost no chance this can be a computer problem, since the T-700R4 is non computerized. But, what the hey, if you can scan it, do so..
The final verdict will be my next post. We at GotTransmissions.com Blog feel so strongly about this whole issue that we are presenting it in 3 pieces. We want you to understand. Thanks and enjoy.
