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Go to the link in my signature to get an 03 FSM. The transmission overhaul starts in section 23B-14. It shows the disassembly diagrams for the automatic. It may be an issue with your detent lever or parking roller rod assembly (See 23B-19, Items 30-36).

Links is back up as of 10:41am 3/19/2019.

Throttle body was discontinued as a new part. Used ones can be found in junkyards and eBay to test with a different unit. https://www.ebay.com/p/2003-Mitsubishi-Montero-3-8-V6-Throttle-Body-MN137646/1825020686 30+ codes seems strange, and if it runs without the MAF, then it has to be fairly...

I have been running Toyo Open Country AT2 in P265/70r17. They have worked well on snowy/icy roads in 4H (AWD). Offroad, I have yet to get stuck somewhere with them. They do make more road noise than the Cooper tires. I'm at about 30k miles and have more than half of the tread life left.

Grab the FSM for a 2003 Gen 3 Montero from the link my signature. The vehicle speed sensor diagnosis starts in Section 54A, Page 32 (54A-32). It may just be a bad connection somewhere.

Also check for vacuum leaks in the hoses. A vacuum leak will cause low engine speed on the 3.5L. It may also happen on the 3.8L. Is there any engine oil leaking into the cylinders while sitting?

I also would opt for the trailer. I use a 6 x 12 utility trailer for all of my carrying needs. It is much larger than a truck bed, and also allows me the full cargo in the Montero if needed. Maybe keep a set of 31" wheels and tires for the towing duty and save the 33s for weekends.

Grab a Gen 3 FSM from the link in my signature and check section 35A for the brake bleeding procedure.

I have occasionally had luck with eBay in the past. Just watch the shipping costs for larger items.

They also will probably not lower the price much. I'd expect that they overvalued it to get them into another car on the lot.

Aisin is the OEM transmission manufacturer for Mitsubishi, Toyota, Honda, Hyundai, and Kia. They made the SP-III spec for the fluid in their units and sell transmissions to the OEM. Each OEM then has their service parts stock the same fluid in an OEM bottle. The Montero just uses an Aisin...

If you are located on the East or West coast, there are also some members who can help check some things in person. Make sure you grab the FSM from the link in my signature. It is a set of linked PDF files that will be invaluable.

RockAuto has the MAHLE valve stem seals on closeout for $0.30 each. Not a bad price if someone needs to get this job done. https://www.rockauto.com/en/catalog/mitsubishi,2005,montero,3.8l+v6,1431547,engine,valve+stem+seal,5800

I agree with you on the FCA drivetrains. I'm actually responsible for the dynomometer (durability with engine) testing for their 8-speed transmissions made by ZF. The 8HP70 is probably our best transmission, but the other driveline components are very good as well. The weakest link may be the...

I went through this very process when my '01 was wrecked. I looked at everything 4WD that I had seen on the trails and also some that were better people carriers. I also found a few Gen 3 limited/03+ models. After outlining the features I liked/disliked of a 03+ Gen 3, I was given a list to...

He mentioned that he has purchased one. I am curious if he has a profile here. I am sure he has gone to the ADD forum for support and information. I also like that he linked the online museum. It has a lot of good history, part of why I keep it in my signature.

It was OEM fluid for KIA, Hyundai, and Mitsubishi. Aisin is just the transmission manufacturer who originally used the fluid. I used the Aisin fluid for my last change, but I have also used the KIA and Hyundai OEM branded cases. Aisin is the original transmission manufacturer where Mitsubishi...

I believe he used the OME kit which is a 40mm suspension lift, so about 2.5". They are very good kits and can be ordered with springs to suit different driving loads.

+1 to Inyo's comment on the transmission fluid. My 2001 did exactly this while I was in college. Especially around 40-45mph going uphill. Less throttle or more throttle with downshifting would stop the vibration. It is actually the torque converter in the transmission shuddering. This...

I also need a right side tail-light assembly. I'll send a PM