The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support STM Tuned
Please Support Fuel Injector Clinic

N/T Stock Transmission to Turbo Transmission Questions (n00b stuff mostly)

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

gunnermaiden

Proven Member
72
1
Jul 27, 2016
Phoenix Area, Arizona
First off, apologies if this has been discussed prior. I've been looking for days on here and couldn't find anything clear or specific enough to understand and didn't want to revive 6 year old posts to ask questions on it.

I have a '99 420a Eclipse automatic with 177xxx on the motor with tons of problems I'm not even going to bother to list. I originally wanted to just fix it up and "restore" it back to base engine, but I decided to go the turbo route. (Yeah buying a GSX/ST is cheaper/easier/m00r p0wer I get it but I don't feel like buying a second project car after just purchasing this one, especially since I don't plan on reselling this car, ever, especially if I built it. And I want the experience).

The transmission is what I'm stumped at. My current one is throwing codes, goes into limp mode occasionally and leaking. I was going to go through some troubleshooting steps I found here: http://www.allpar.com/fix/trans.html , but now I'm wondering, if I have to make a more capable engine to handle boost, I have to do the same for the transmission too, right? So should I even bother trying to fix it if I have to have a "better" one?

Well I can't seem to find any valuable/clear information or lists anywhere on where I'm supposed to start/what I'm supposed to do to get a more robust transmission for a decent turbo build, or if someone even makes one specifically for 420aT's, or maybe I'm having a major blond moment LOL. I've seen some posts about swapping a 420a auto trans with a GST trans, looks like it could go either way though. GSX I know for sure is out of the question. Even saw some Neon ideas but not sure if that's a good route. Kind of just want something a bit stronger that will work with handling decent boost that just bolt right up nice and easy, that's probably asking for a lot though haha ;). I do not plan to do a manual swap by the way, I couldn't care less for the whole auto vs manual thing.

Uh, where to start with the trans?
 
You should try 2GNT.com you will have a better chance to find your answer. For the automatic trans there is many options for tbe 420A guys. I had one rebuilt with a shift kit made it a much more enjoyable car. But I never did add boost to my car. Most guys opt for a manual swap. What I did was just by a parts car for $400 with a blown motor to do the swap. But I haven't started yet. There are plenty of right ups on it. Good luck.
 
http://www.dsmtuners.com/threads/neon-trany-to-420a-dsm.362805/

Hey guys, found ^that^ awesome thread on here. Didn't want to revive it so transferring it here. Looks like Neon is the way to go, or even a PT Cruiser and there's A LOT of dead ones in my area to pick at, but what are they referring to when they mention the LSD on the SRT4?

Also, thanks for the chart but damn I'm so n00b I have no idea what I'm looking at. Zero transmission experience here. I might just have to have a transmission shop do this for me unfortunately, especially since I don't have any friends/family to help with my build >.> But it deff helps to armed with information when I go so I don't get ripped off or whatever. Never had a good experience at a shop.

And yes, 2gnt has been a huge help already. Got a lot of the engine building stuff from there and that's where I got most of my charts for the build.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top