4L30E problems on 2000 Trooper

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4L30E problems on 2000 Trooper

Postby Atoyot1031 » Wed Apr 14, 2021 3:49 pm

All,
I searched a bunch, and am looking for some direction. Purchased a super clean 2000 Trooper limited for my son. It has 130k miles. Everything is great except the tranny.

Gear selection seems fine. Reverse works well. In drive, it goes into 1 easily and smoothly. Sometimes slips into 2. When I try to go into 3, it's like it is in neutral. RPMs rev and no drive.

What we've done so far:
Replace shift solenoids 1-2/3-4 and 2-3. No change.
Adjusted band per instructions.

No codes through OBDII. Got a "check trans" light when we drove it for a bit in 2nd gear.

Not sure which direction to go on troubleshooting from here, so I thought I'd check in with the experts.

Thx in advance!
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Re: 4L30E problems on 2000 Trooper

Postby Buster28 » Thu Apr 15, 2021 5:09 am

If you select Winter Mode in Drive with the truck stationary it selects 3rd gear. When you accelerate with Winter Mode selected does the truck get up to speed slower than 1st gear but reasonably quick or the truck won't move or accelerates very slowly?

In 3rd gear/Winter Mode the 2nd clutch drives the planetary gear set long pinion gears and the 3rd clutch drives the planetary gear set short pinion gears.

The planetary gear set long and short pinion gears are always meshed together. The 2nd clutch frictions are mated to the 3rd clutch drum so the the 2nd clutch assembly and 3rd clutch are assembly are rotating at the same speed when the 2nd clutch is applied. Therefore, with the 2nd clutch driving the long pinion gears and the 3rd clutch driving the short pinion gears at the same time the planetary gear set is locked and the planetary carrier and tail-shaft rotate at the same rpm and direction as the input from the OverRun Clutch ("Direct"). The 3rd gear ratio is 1 : 1

If the transmission feels like it is in Neutral with Winter Mode selected the 3rd clutch is probably burned up.
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Re: 4L30E problems on 2000 Trooper

Postby Atoyot1031 » Fri Apr 16, 2021 1:01 am

Buster28 wrote:If you select Winter Mode in Drive with the truck stationary it selects 3rd gear. When you accelerate with Winter Mode selected does the truck get up to speed slower than 1st gear but reasonably quick or the truck won't move or accelerates very slowly?

In 3rd gear/Winter Mode the 2nd clutch drives the planetary gear set long pinion gears and the 3rd clutch drives the planetary gear set short pinion gears.

The planetary gear set long and short pinion gears are always meshed together. The 2nd clutch frictions are mated to the 3rd clutch drum so the the 2nd clutch assembly and 3rd clutch are assembly are rotating at the same speed when the 2nd clutch is applied. Therefore, with the 2nd clutch driving the long pinion gears and the 3rd clutch driving the short pinion gears at the same time the planetary gear set is locked and the planetary carrier and tail-shaft rotate at the same rpm and direction as the input from the OverRun Clutch ("Direct"). The 3rd gear ratio is 1 : 1

If the transmission feels like it is in Neutral with Winter Mode selected the 3rd clutch is probably burned up.



Tried it this evening. Feels like neutral in winter mode, so it sounds like it's time for a full rebuild.

Any suggestions on rebuild kits for 2000 and on torque converters? Most kits look like they are $200-$275. Are there some that have better reputations or are more complete? Anything else we should tackle at the same time?

Thanks again in advance!
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Re: 4L30E problems on 2000 Trooper

Postby Buster28 » Fri Apr 16, 2021 10:07 am

I think the best approach is to tear the transmission down and carefully clean and inspect the parts to determine exactly what you need to accomplish the quality of rebuild you want. Then see if parts kits have the parts you need and if you can determine what company manufactured the individual parts. There are a lot of bushings, clutch plates, filters and mechanical parts that may need replacing. Consider replacing the Sprag mechanical clutch and the brake band.

The 2000-2002 Trooper 4L30e has a Pulse Width Modulated (PWM) Torque Converter Clutch (TCC) control system. Sonnax has an improved TCC pressure regulator valve that you should consider installing because the OEM one tends to get stuck. They have other upgrades as well https://www.sonnax.com/units/162-4l30-e.

Also, the friction material on a PWM Torque Converter Clutch is more robust than a non PWM Torque Converter Clutch so make sure you buy the correct Torque Converter if you plan to replace it.

Check out this rebuild tutorial:
http://scottj.info/files/isuzu/4l30e.pdf
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