1999 Jaguar XJ8 transmission

BRYANSJAG

MEMBER
1999 JAGUAR XJ8
V8
2WD
AUTOMATIC
80,000 MILES

I changed the oil in the jag and now the trans is slipping and making some noise when it shifts. When I drained the oil there was a bolt to what I thought was the oil pan that need an allen wrench to remove. Never seen that before. Oil came out ( not trans fluid) and now the problem. When I replace the oil, ( it takes 6.9 quarts) it showed over full just after 5 quarts. Did I some how empty the trans fluid instead of oil? Is there such a thing as trans oil? This car never needs to have trans flid replaced according to the manual. Thanks for any help Bryan bbb1007@gmail. Com

1 Reply

DAVE H

MECHANIC
13,384 POSTS

It does sound like yo may have drained the trans fluid (ATF). You need to check the trans fluid level is correct !

On S-Type models, 5R55N transmission is filled-for-life and does not require fluid changes, except under severe service conditions. Routine fluid level checking is not required and a dipstick is not provided. A fluid level/filler plug is used to check fluid level and make corrections. Under severe service conditions, change fluid every 30,000 miles (48,000 km).
On XJ and XK models, ZF 5HP24 transmission is filled-for-life. Transmission is filled-for-life and does not require fluid changes, except under extreme driving conditions. Routine fluid level checking is not required and a dipstick is not provided. A fluid level/filler plug is used to check fluid level and make corrections.
On XJ and XK models equipped with a supercharged W5A580 transmission is filled for life and does not require fluid change or performing routine level checking. A sealed dipstick tube is installed for service requirements only. A Dipstick (307-379) is available as a special service tool and not installed as standard equipment

ZF 5HP24
Park vehicle on level ground. Apply parking brake. Wait at least 2 minutes. Ensure transmission fluid temperature is less than 86 °F (30 °C). Start engine and verify idle speed is 600-750 RPM. If idle speed is not correct, repair as necessary.
Move gear selector from Park to Drive to Reverse and back to Park. Raise and support vehicle. Remove fluid filler/level side plug. Fluid level should be level with bottom of filler plug hole and flow of fluid should be a trickle after about one minute. Top off as necessary.
Top off using a syringe dedicated to transmission fluid only (not used for any other type of oil or fluids). Ensure transmission fluid temperature is less than 122 °F (50 °C). Inject transmission fluid into filler side plug until it overflows from plug opening. Wait for at least one minute until flow of fluid is reduced to a trickle.
Install fluid filler/level side plug and tighten to specification. See TORQUE SPECIFICATIONS. Check for leaks and clean up spilled fluid.