98 TJ, 2nd gear hard shlft cold, manuel trans - Jeep Wrangler Forum
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Old 04-07-2012, 04:53 AM   #1
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98 TJ, 2nd gear hard shlft cold, manuel trans

Hi, when the Jeep is cold it does not want to shift into 2nd (manuel trans) is this a common problem.......Why?

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Old 04-07-2012, 09:15 AM   #2
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The only common problem I know about (might be others) is that the shifter boot is too stiff when it is cold and after it warms up it stretches a little easier. Don't know if that is the kida problem you are asking about or an actual internal tranny problem.

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Old 04-07-2012, 09:49 AM   #3
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i have a 2006 with the same issue. thats why its common for tj owners it skip second till it warms up..dont worry its common.
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Old 04-07-2012, 10:12 AM   #4
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Not sure about 98 or 06 transmissions, but for my 01's NV3550 I hear that changing the transmission fluid to a synthetic like Royal Purple Syncromax or Redline MTL will take care of the cold shifting issues. 98 may have the same trans, I think 06 is a 6 speed, might want to search on this forum, probably the same issue. I've been running Pennzoil Syncromesh for years just because it's the only one available locally, and the 1st shift into second when it's around 20 or so is my only complaint. So until I order the Redline MTL online, I just shift through the gears once before I go anywhere when it's cold out. Common problem.
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Old 04-07-2012, 10:17 AM   #5
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Just saw that you live in Cali. Not sure what part, but if it's above 50 degrees or so and your having these issues, I'd check/change your trans fluid and clean off the magnetic drain plug. If it's always done it, or you just installed a body lift or a T-case drop, check your shifter clearance with the boot and under it.
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Old 04-07-2012, 10:21 AM   #6
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Neither of these two gear lubes are miriicle cures but for your '98 AX-15 transmission, I would do a gear lube swap to either Redline MT-90 (a GL-4 75W-90 gear lube) or a good brand of synthetic 10W-30 which was approved a few years ago for use in the AX-5 and AX-15 transmissions by their manufacturer.

No worries that it seems the 75W-90 and 10W-30 viscosities are too dissimilar, they're not since gear lubes and motor oil are measured on two different viscosity scales. In reality, they are essentially the same viscosity.

2000 and newer transmissions require a different lubricant for their transmissions where Redline MTL and Royal Purple Synchromax are good choices. Amsoil Synchromesh is also a good choice for 2000 and newer manual transmissions... but not GM or Pennzoil Synchromesh.
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Old 04-07-2012, 10:35 AM   #7
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I noticed at my local parts stores the Royal Purple Syncromax has been replaced with RP Max Gear in either 75w-90 or 75w-140. I checked them out online to see if it was replacing the Syncromax, but their website shows both. I noticed that it says the Syncromax is designed for manual transmissions that take ATF, and the Max gear can be used in diffs and transmissions.
Oh well, I need to just go online and get the MTL, i found a decent price on Amazon.
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Old 04-07-2012, 10:36 AM   #8
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Any time you have a gear lube viscosity choice for the transmission, always choose 75W-90.
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Old 04-07-2012, 10:39 AM   #9
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Yeah, I figured the 140 would be too thick for the trans. You hear anything about the Max Gear though?
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Old 04-07-2012, 10:45 AM   #10
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RP's Max Gear would be fine, RP specifically says it is safe for yellow metals which means it is safe for use inside a manual transmission. Yellow metals include brass like a manual transmission's synchronizers are made out of.
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Old 04-07-2012, 10:48 AM   #11
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One way you can try to help this is to put the transmission into 4th or 5th gear, and put the transfer case (4wd lever) into neutral. Then let out the clutch. This will spin the gears inside the transmission very fast, warming them up hopefully faster. After a minute or so just push in the clutch, put it back into 2wd and hopefully it will be warmer by then
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Old 04-07-2012, 12:28 PM   #12
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Thanks so much!!!

Thanks for all the info, I do live in the desert but it has been cold in the mornings, high 30's to mid 40's, in the afternoons when i leave work (mid 70's) I usually only have the prob in the first minute or so. I did notice that the boot is stiff in the morning........ I will do the synthetic though, great info, Thanks!

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