Only when it's cold, my 1999 Grand Cherokee won't shift into second gear or will only after A: I let up on the gas or B: after it revs past 4K RPM. After a few stop and go shifts, and when it's warm, you'd never know there was a problem. fluid is full and not burnt. any thoughts?
Many thanks!
What is happening is your loosing pressure at the front servo. The seal round it is swelling up as it warms up and the problem goes away. The best fix is to rebuild the transmission. If that is not in the budget, there are some cheaper solutions. First you could add some trans tune. Any parts store will have some variation of it. If that does'nt work a very small amount (a cap full or so) of brake fluid should. It will cause the seals to swell. I would recommend,after adding brake fluid, having the transmission flushed after driving the truck 50-100 miles. Hope this helps.
Jeep five-speed automatic transmission
An all-new, electronically-controlled transmission with five forward ratios including an alternate second gear ratio for improved performance for passing and better fuel economy is available with the V-8 only, and was designed specifically for Jeeps. The transmission features unique characteristics such as a tall, 3.00:1 first gear that gives the driver better initial acceleration. Real-time driver adaptive shifting fine-tunes the shift pattern to the driver, while an alternate second gear ratio gives the driver five forward ratios. During acceleration, second gear has a ratio of 1.67. Depending on speed and throttle position, both this gear and an alternate 1.50 second gear ratio are available for kick-down operation, making the down-shift smoother. Its reverse gear ratio is equal to the first gear ratio, to allow for heavier loads. Other features include three planetary gear sets that combine the widest range of gear ratios available in any transmission in its class. Combined with precise step selections, this brings smooth shifts and maximum power and optimal fuel economy. The transmission is built at the Indiana Transmission Plant in Kokomo, Indiana, in an all-new 1.2-million square-foot (110,000 m2) facility.
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Transmission won't shift when cold
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