Q&A / Tech

Mailbag: The Cure for Off-Road Transmission Slip

You’ve got questions. We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, troubleshooting and troubled tranny.

K.R. Denham Springs, LA

Q: When going up steep, muddy hills, the transmission in my 1999 Jeep Wrangler slips. On the road, the transmission operates fine. The Wrangler has a 4.0L 6-cylinder engine with a Torqueflite A-999 automatic transmission. Is this a difficult problem to repair?

A: The slipping you are experiencing is most likely caused by the fluid pickup becoming uncovered when the vehicle is at an angle. Skyjacker makes bolt-on, extra deep transmission pan that solves this problem. While you’ve got the pan off, we also recommend you perform a transmission service. Pay particular attention to see if water is entering the transmission and replace any leaking seals as necessary. Adjust the bands to factory specs and install a high-quality replacement filter kit. Last, top off the transmission with the appropriate amount of ATF +4 fluid, and you’ll be all set.

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