Fixing your own transmission?

[86MCSS]

How many of you have attempted rebuilding your own transmission? I have personally never done it and wonder how hard or difficult it might be? Whats needed? I am mechaniclly inclinded and have done rear end gears before and head swaps and many other things for my DSM and including many SBC's and SBF's.

Last night I lost second gear. I would pop out as soon as I put it into second. I have an extra transmission that is supposedly good. I will be installing it tomarrow and I guess ill find out. But since Ill have this one laying out maybe I can fix it myself?

All replies welcome.

 

[Colossus]

http://www.twingles.com/ideck/rebuild3/dretranny.htm

This is the guide I'm assuming you'll need (you're a 1g) It's a rebuild guide. I'm using the 2g guide now off the same site (vfaq.com) to rebuild a GST tranny for a friend. Dissassemble and reassemble that is.

 

[86MCSS]

Sweet thanks for the guide man I didnt even know there were some.

 

[dawgedeclipse]

For what its worth, I have done it. And it was well worth it. Here is what Ive found out doing it. The stock syncros from the factory have teeth in three areas of the syncro, almost like a triangle, and not all the way around. The new syncros I put into my car had teeth all the way around. Maybe this is one of our biggest downfalls of the factory syncros in the transmissions. Ive had mine rebuilt by me for about 2 years and it still shifts like butter

 

[86MCSS]

What brand synchros did you use? Where did you get them? I am going to be attempting it this week and hopefully finish by friday.

I had an extra transmission that I was told was good and is just horrible so I have to finish this one ASAP :thumbdown

 

[1fast97gsx]

I did mine myself too a few times now. The problem isn't really taking it apart and putting it back together, but it's knowing what parts are really bad and what parts are still ok. The actual process of rebuilding it is quite simple and can be done in 2-3 hours no problem.

 

[1fast97gsx]

For what its worth, I have done it. And it was well worth it. Here is what Ive found out doing it. The stock syncros from the factory have teeth in three areas of the syncro, almost like a triangle, and not all the way around. The new syncros I put into my car had teeth all the way around. Maybe this is one of our biggest downfalls of the factory syncros in the transmissions. Ive had mine rebuilt by me for about 2 years and it still shifts like butter

What parts did you actually replace? Just the syncros and gears or did you do the input shaft, bearings, and hub and slider assemblies as well? I'm trying to determine what all I should replace on my other trans since I don't want it breaking again 1000 miles later.

 

[dawgedeclipse]

I put brand new seals and syncros. The syncros I got were from satan(dealership), my guess is they revised them. The rest of my tranny was fine, gears, bearings, slides etc all good. I however did not replace the 5th gear syncro and regret it till this day, however its easy to get to and easy fix. You will need a machine shop to press off and on the bearings, cost me 5 bucks for both at a shop i do all my business at. Syncros at dealer are about 10.00-15.00 each.

 

[1fast97gsx]

You didn't replace any gears either!? Hmm makes me wonder if I should even bother replacing them then as well. Did you have slight chipping at some of the upper teeth of the gears ( where the syncro grabs it ) and were you able to actually feel the chips? I have a few really tiny ones that aren't even really noticeable but I'm thinking maybe that's ok and I don't need to replace anything other than the syncros and seals this time.

 

[86MCSS]

You didn't replace any gears either!? Hmm makes me wonder if I should even bother replacing them then as well. Did you have slight chipping at some of the upper teeth of the gears ( where the syncro grabs it ) and were you able to actually feel the chips? I have a few really tiny ones that aren't even really noticeable but I'm thinking maybe that's ok and I don't need to replace anything other than the syncros and seals this time.

Since you basically have it apart and since we were told the gears at the dealership are not that expensive why not just replace them? I am more than sure you will regret it later on. If you can see or feel the chipping I say change out the synchro or any other parts that appear similar.

 

[VerbalKint]

I've got mine apart in the garage at this very moment.

Been debating on where to get a 'rebuild' kit.

You say the gears and syncro's can be gotten from a dealer? The only thing I am hesitant about pulling apart are the shafts / gears themselves.

The only REAL problem I see is my input shaft bearing, missing 4 steel balls.. Amazingly enough, there is no 'VISIBLE' damage to any of the gear teeth, or the casing.

What about the 'non reuseable' parts? Can those be gotten from the dealer cost effectivly?

Thanks


Dave

 

[unior]

I have a few really tiny ones that aren't even really noticeable but I'm thinking maybe that's ok and I don't need to replace anything other than the syncros and seals this time.

well you can at least file down the chips

 

[1fast97gsx]

yea that's what I instend to do. As far as gears being cheap from the dealership as someone was saying. I believe they quoted my around $80 a gear so multiply that by 5 and that's $400 ... not so cheap anymore. In a lot of cases the idler gear and possibly the input shaft will need to be replaced if you have the reverse grind problem and at that point why not replace the bearings as well? Now we're looking at $600 already. Then add the syncro kits and theres another $100. :thumbdown

 

[DBR GVR4]

Since you basically have it apart and since we were told the gears at the dealership are not that expensive why not just replace them? I am more than sure you will regret it later on. If you can see or feel the chipping I say change out the synchro or any other parts that appear similar.

Mother F**king SAL, Finaly figured out your screen name on here, Nick said you might be intersted in haveing me rebuild one of your trannys. let me know, soon as i have to take mine out and im going to fix revers while its out, i can show you how easy it is and you can probibly do it if you wanted.

 

[86MCSS]

Mother F**king SAL, Finaly figured out your screen name on here, Nick said you might be intersted in haveing me rebuild one of your trannys. let me know, soon as i have to take mine out and im going to fix revers while its out, i can show you how easy it is and you can probibly do it if you wanted.

This Guy right here

...The first tranny I have was already torn apart and not rebuildable There was a lot of things messed up on it and teeth were shatterted everywhere. So at this point in time I am removing the one from the car so I will have two transmissions and plan on and hopefully being able to take both of them and make one good one. I was going to call you the other night but Nik said you were busy. Plus I need to learn to do it anyways.

 

[logic]

There's another excellent document on doing a transmission rebuild, direct from Mitsubishi, right here:

http://www.galantvr4.org/rhertz/ManualTrannyRepairSchool.ZIP

Thanks to Ryan Hertz over at GalantVR4.org for hosting that. You might also want to take a look through the shop manuals; the information in there is indispensable.

 

[DBR GVR4]

This Guy right here

...The first tranny I have was already torn apart and not rebuildable There was a lot of things messed up on it and teeth were shatterted everywhere. So at this point in time I am removing the one from the car so I will have two transmissions and plan on and hopefully being able to take both of them and make one good one. I was going to call you the other night but Nik said you were busy. Plus I need to learn to do it anyways.

If you still have that phucked up one ill take it off your hands, i can use the case and center and front diff for some more of the evo I gear swaps im planing. pm me on bsr to talk about it

 

[1993-Talon-TSI]

I have been looking for a posting like this for some time now. When putting the tranny back together, what is all involved in setting the proper preload on the bearings and how do you calculate/do this?? if someone could explain about this i can take it from there.
any help would be great i am ready to put the tranny back together, also what do you use on the case to seal them, like an RTV sealent?

 

[unior]

I have been looking for a posting like this for some time now. When putting the tranny back together, what is all involved in setting the proper preload on the bearings and how do you calculate/do this?? if someone could explain about this i can take it from there.
any help would be great i am ready to put the tranny back together, also what do you use on the case to seal them, like an RTV sealent?

service manual calls for you to check endplay by using small pieces of solder....then using shims..check your mitsu service manual for details

 

[galant5spd]

service manual calls for you to check endplay by using small pieces of solder....then using shims..check your mitsu service manual for details

where do you get these shims, can you skip this step and just replace the synchro rings also, will just replacing the synchro rings fix rough shifts?

do the synchronizer springs where out at all?

 

[dima126]

For what its worth, I have done it. And it was well worth it. Here is what Ive found out doing it. The stock syncros from the factory have teeth in three areas of the syncro, almost like a triangle, and not all the way around. The new syncros I put into my car had teeth all the way around. Maybe this is one of our biggest downfalls of the factory syncros in the transmissions. Ive had mine rebuilt by me for about 2 years and it still shifts like butter

whats the part number for those syncros that you got with the teeth all the way around and is there anyother place to get them or every dealer should have them? i have mine apart right now and dont know where to get better then stock syncros...

 

[86MCSS]

whats the part number for those syncros that you got with the teeth all the way around and is there anyother place to get them or every dealer should have them? i have mine apart right now and dont know where to get better then stock syncros...

Just go to the dealer and ask for the synchros for your transmission. It would be best to take in your VIN# since some of those guys sometimes will not do anything without it.

Also the new synchros from the dealer are revised so the teeth are "all the way around" now.

 

[unior]

the dealer has the shims

they are all different sizes

refer to the PDF file posted earlier the mitsu trans repair school - they say everything about shimming the bearings in there

some require preload you measure the clearance and use on size larger spacer

some require endplay you measure and use one size smaller spacer

 

[1993-Talon-TSI]

Thanks,
That pdf file is awesome, anyone should be able to rebuild a tranny after reading that, its like tranny College!

Great posting!

 

[ITSME4G63]

Just go to the dealer and ask for the synchros for your transmission. It would be best to take in your VIN# since some of those guys sometimes will not do anything without it.

Also the new synchros from the dealer are revised so the teeth are "all the way around" now.

it would be best, but if you got a jdm trans that fubared then I guess youre shit outta luck? Just wondering if you knwo the mmitsu part syncor numbers? Thanks.

The rebuild guide looks very detailed, it will help me trying to put my friends fwd trans together, thanks.