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Unread 07-06-2009, 07:53 PM   #1
crashcraddock
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Is the trans go shift kit the way to go on high mileage trans?

I have a 00 WJ 4.7 with 117K and was wondering if it would be ok to put the trans go shift kit in? Are the shifts going to be much harder with normal driving, or only WOT? The torque converter, when on the highway, sometimes jumps out of "lock up" when I hit a bump, so I'm hoping a good fluid change with the shift kit will help my problem. What do you guys think?

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Unread 07-06-2009, 07:55 PM   #2
jeep95xj
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I wouldnt touch a tranny with 117K miles on it. Not worth doing al the work unless your going to rebuild it at the same time.
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Unread 07-06-2009, 09:22 PM   #3
ajmorell
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Quote:
Originally Posted by jeep95xj View Post
I wouldnt touch a tranny with 117K miles on it. Not worth doing al the work unless your going to rebuild it at the same time.
What?


If you are going to do a fluid/filter change might as well do the shift kit too. The shift kit ups the line pressure and makes for firmer, faster shifts which results in cooler tranny temps. Last I checked the shift kit only required dropping the valve body to install.
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Unread 07-06-2009, 11:25 PM   #4
jeep95xj
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Right unless the fluid and filter haven ever been changed. That would make for some real nice toasty fluid. Once changed you will be in for a rebuild anyway.
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Unread 07-06-2009, 11:32 PM   #5
ratmonkey
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Go for it. You'll not only have better shifts from the kit, but also because of a clean vb and servos. You tcc lock up issue is probably a brake switch getting funky though.
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Unread 07-07-2009, 09:28 AM   #6
mrese
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I spoke with a trans rebuild shop and they said if it is working DO NOT add the shift kit as thhe higher line pressures have a good chance of messsing things up and you WILL be driving it harder there by hasteninng the tranny's demise.
I do think it is a very solid transmission keep the fluid clean and you will be good to go.
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Unread 07-07-2009, 09:46 AM   #7
crashcraddock
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The fluid was changed by the previous owner at 82K. I thought the reduced slippage would make the tranny last longer. I'm not installing the kit to make the tranny shift hard or for racing applications, but just for the reduced slip and firmer tcc lock up. I've also read on some dakota forum that under normal driving you wouldn't notice the kit was installed, e.i. the tranny still shifts the same, just quicker.
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Unread 07-07-2009, 10:06 AM   #8
ajmorell
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Quote:
Originally Posted by mrese View Post
I spoke with a trans rebuild shop and they said if it is working DO NOT add the shift kit as thhe higher line pressures have a good chance of messsing things up and you WILL be driving it harder there by hasteninng the tranny's demise.
I do think it is a very solid transmission keep the fluid clean and you will be good to go.
Mark, I don't follow. How will the higher line pressures mess things up? I wouldn't hesitate to install the kit, I have one in my ZJ and think it's great. The firmer & faster shifts are just an added benefit compared to the lower tranny temps IMO.
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Unread 07-07-2009, 10:21 AM   #9
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Not to thread hijack, but how tough are these shift kits to install once the trans pan is off?
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Unread 07-07-2009, 10:25 AM   #10
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Agreed, don't know to much about these shift kits
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Unread 07-07-2009, 11:04 AM   #11
ratmonkey
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Quote:
Originally Posted by mrese View Post
I spoke with a trans rebuild shop and they said if it is working DO NOT add the shift kit as thhe higher line pressures have a good chance of messsing things up and you WILL be driving it harder there by hasteninng the tranny's demise.
I do think it is a very solid transmission keep the fluid clean and you will be good to go.
quicker shifts(harder) and higher line pressure will make a transmission last longer. those soft shifts are because the stock programming lets the clutches slip more between gear engagements.
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Unread 07-07-2009, 11:07 AM   #12
the88thpianoman
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Quote:
Originally Posted by ratmonkey View Post
quicker shifts(harder) and higher line pressure will make a transmission last longer. those soft shifts are because the stock programming lets the clutches slip more between gear engagements.
Less clutch slip = less clutch wear. I have my TV cable pulled out all the way for the same reason, though it only does a fraction of the good of a shift kit.
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Unread 07-07-2009, 12:04 PM   #13
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Here's another perspective before you go modding the tranny; I've got 100 K on my tranny and I just recently did the tranny firmware upgrade to get 5th gear added. Significant difference in how it behaves. My rpm at 60mph is down 450 rpm and mileage went up.

Now this upgrade is only available to the 99 & 00 models as the rest already had it from teh factory, but what it did was put in a "taller" final drive ratio....which means (to me) that on the highway, if encountering slight hills, it may be downshifting or coming out of lockup to compensate for the taller gear more then you like.... That makes sense to me at least...

So do this first...look to see if the upgrade has been done by looking for the modification sticker in your engine compartment. If it's there, you might consider asking the dealer to downgrade the firmware (if that's even possible).

Otherwise, I'm assuming that you've already cleaned out your TB for a better throttle response. At 100K miles, mine was NASTY and i could see how it might cause the engine not to have that small bit more breathing ability that makes the tranny come out of lockup for slight grade changes....
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Unread 07-07-2009, 01:56 PM   #14
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Quote:
Originally Posted by the88thpianoman View Post
Less clutch slip = less clutch wear. I have my TV cable pulled out all the way for the same reason, though it only does a fraction of the good of a shift kit.
Yup. Less clutch slip also = lower tranny temps.
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Unread 07-07-2009, 03:34 PM   #15
crashcraddock
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The kit is easy to install. There is a good write-up on it at http://www.nagca.com/forum/showthread.php?t=33521 . Also I have a 99 4.7 that has the TCM flash and the 00 4.7 doesn't, the 99 shifts much better. At 70mph my 99 with stock tires is about 2000rpm the 00 with 32" tires at 70 mph is closer to 2450rpms. Lastly why fix, rebuild, something if it isn't broke? These trannys can last a long time with the proper maintance, I think at 117K, it's just about half way into the life of my tranny. Even if it goes out at 130K that's another year I can save my cash.
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