'95 Monte Carlo W/4T60-E Transmission - Dark Fluid
I recently flushed the transmission oil cooler and changed the filter and fluid in my '95 Monte Carlo, and now after 6 weeks, the fluid is very dark again. The car shifts fine, with no slippage, but I am concerned that trouble is coming soon. The fluid does not smell burnt, I suspect the dark coloring is caused from metal particle contamination. There was some metal in the pan when I did the flush -&- filter change 6 weeks back. Is this transmission prone to problems? The vehicle has 75,000 miles, and has not been abused.
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Dry...................................... 15.0 quarts
Overhaul.............................. 12.6 quarts
Bottom pan and side cover.... 8.0 quarts
If you didn't add 15 quarts, there was some mixing with the old fluid.
As far as fluid discolouration, oxidixed or overheated fluid is usually brown. Very dark brown or black (and smelly) is a result of suspended carbon particles from burned compressed paper clutch facings, band linings, or torque converter clutch. Metal hard part failure usually results in silvery, gritty specks in the fluid.
The 4T60-E is a generally reliable transaxle. One of the more common problems is wear in the torque converter clutch regulator valve bore in the valve body, allowing leakage past the valve and causing converter clutch hunting at higher speeds.
p.s. Did Cutlass Cieras and Centurys use the 4T60-E also?
3, 4 or 5 = forward speeds (5 speed in BMW 3-Series E46 (M90), 3-Series E46 (M82), and 5-Series E39 (M82)
T = transverse mount (transaxle, FWD in all GM except Pontiac Fiero)
L = longitudinal mount (RWD)
40 to 80 = torque capacity range
E = electronic control
The 4T60-E was the evolution of the original Hydramatic 440 transaxle. It was replaced by the 4T65-E in most FWD applications in the 1997-1998 model years.