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Old 12-11-2012, 08:39 PM   #1
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Tj auto tranny shifts out of low gear when in 4 low

Hello,

My TJ 05 Unlimited shifts out of low gear into second and third when going down a steep hill when the rpms start to pick up even when i have the shifter in the L slot is this normal or do I have a problem? Thank you for any info. Also this is when I'm in 4 low and it is an automatic trans.

Dean

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Old 12-12-2012, 11:42 AM   #2
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That is not normal. It should stay in Low to provide engine braking on downhill grades.

With my lower gears installed, tranny in Low, and transfer case in 4lo, I can crawl down steep hills without my foot on the brake.

What position the transfer case is in should make no difference.

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Old 12-12-2012, 11:47 AM   #3
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Quote:
Originally Posted by deanc View Post
Hello,

My TJ 05 Unlimited shifts out of low gear into second and third when going down a steep hill when the rpms start to pick up even when i have the shifter in the L slot is this normal or do I have a problem? Thank you for any info. Also this is when I'm in 4 low and it is an automatic trans.

Dean
the 05 42RLE doesn't have a "L" tranny selector like an AW4 in an XJ. so is the transmission selector in 1st, 2nd, or Drive?

If it's in Drive, that's normal. In fact, that's why the transmission selector & OD off button are there...so you can control which gear the trans goes into. If the selector is in 1st, it's not normal and it should stay in 1st.

By "L slot", I'm assuming you mean 4wd Low...thing is, the trans doesn't know or care what the t-case is doing. You still need to control the transmission via the selector if you don't want it to upshift as RPMs increase...
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Old 12-12-2012, 05:21 PM   #4
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Thanks for the info.. yes when it is ln 1st it will upshift when going down hill any idea what would cause that?
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