2g nt Transmission rebuild must read!!!

spooln1 · 02-27-2006, 08:50 PM

Alright if you don't already know this the 1/2 syncros cant be replaced on the Chrysler 5speed because they are on the output shaft with an interference fit. Also we just got one in at our shop to rebuild and just found this out. This shaft you have to replace as a whole and we had an estimate of 1500 dollars for the output shaft. So dont worry if you have the mitsu trans because it is easy to replace those but chrysler sorry. Out of luck. so take it easy. Just thought i would warn anyone who had them.

VelocitàPaola · 02-27-2006, 09:21 PM

You can rebuild them. Several people have done it - all you need is a shop press to get everything apart. The parts are difficult to source since Chrysler lists it as a "non-servicable" part, but there is at least one aftermarket company that makes rebuild kits; not to mention you can always get parts from other busted trannies (provided their 1/2gears or synchros aren't shot).

spooln1 · 02-27-2006, 09:28 PM

You have to use a shop press and a torch at extreme heat and extreme hydraulic pressure and when you finally get it off to get it back on it will never be a strong fit at all. and if you have found a way to do it tell me. Because my drivetrains instructor at SIUC number one automotive school in the nation says it cant be done with a reliable strong fit.

VelocitàPaola · 02-27-2006, 09:33 PM

Quote:

Originally Posted by spooln1

You have to use a shop press and a torch at extreme heat and extreme hydraulic pressure and when you finally get it off to get it back on it will never be a strong fit at all. and if you have found a way to do it tell me. Because my drivetrains instructor at SIUC number one automotive school in the nation says it cant be done with a reliable strong fit.

I haven't done it personally, but several of the administrators at 2GNT have done it with success. They never reported having to use heat or any extreme force... just a simple shop press.

Terry, one of the N/T member of DSMTuners, was the first to find that it can be serviced, I believe. I'll see if he will post about his experiences here.

Here is a link to a thread he made about his rebuild.

http://forums.2gnt.com/dcboard.php?a...4861&mode=full

spooln1 · 02-27-2006, 09:40 PM

Well from personal experience to get them off you have to use extreme very unsafe pressure and yes they do basically explode. So i would highly recomend not trying it plus i dont know how he ever got it back on there with a good fit there are no splines even it is just pure flat interferrence fit.

Talon ESI-T · 02-28-2006, 06:14 AM

I have rebuilt my share of 2gnt tranny's. Honestly they are not bad at all to work on, i like the turbo trans a little better due to housing design but it has more equipment to deal with.

The nototrious output shaft......... This can be rebuilt reletively easy. 1st off, Synchro's are aftermarket only as you stated V. Any damage to the gears means finding a parts trans. Dissasembly does not require heat or any unsafe amount of pressure. I personally use a 12 ton press and the shaft comes apart easily once you break the initial seal sort to speak.

I cant take credit for being the first to disassemble the shaft but I appreciate the aknowledgement. Another member on 2gnt who was logging in from one of the Neon boards actually gave me the idea when he did it. He was searching for a new pinion shaft.

While we are on the topic some good 2GNT trans (NV T350 3.94 Final drive) info:

Synchro's are a steel ring with a paper type lining. Same lining used in auto trans clutch plates. The same reason for using dealer only fluid. Factory Synchro's 3/4/5 are about 550.00 from dealer

Aftermarket synchro kit is brass and in order to get the synchro's you must buy the master overhaul kit. This consists of:

Input seal
Shift lever seals
Diff bearings
Output shaft bearing
Shaft main bearings
synchro's 1-5 and the input shaft brake (2gnt only)
1-2 Synchro's are double synchro's

The kit does not come with sliders or dogs (Dogs are the little metal ball detent squares that apply pressure against the slider. Not to be confused with Dog teeth which are what the slider meshes with to engage the selected gear. The term "Dog" might be a regional term used by shops in this area since a few others have not heard this term before.

Now your first question is about what I called the input shaft brake. The 3.94 2GNT trans has a Synchro on the opposite side of 5th gear. In your shifter this is reverse. The Synchro slows the input shaft down when you go into reverse. The reverse gear itself does not have a synchro. The best logic I can use on this synchro is that the factory put it there for longevity of the trans. The 3.55 Neon trans does not have this synchro.

If anyone likes I can get some pictures loaded onto 2GNT to show anything unclear.

V, thanks for pointing me here and the vote of confidence.

If anyone needs an output shaft, I might have the means to aquire you one since myself and a few others have a stock of parts.

Not sure how far Carmi is from Joliet but i would be happy to show you anytime you might be in the area. Trans work is done in my spare time in my garage.

Terry

VelocitàPaola · 02-28-2006, 06:29 AM

Thanks Terry. I'll be getting in touch with you sometime next Fall when I do all my tranny work.

And by the way, I e-mailed you once or twice about the all brass synchro kit - and you said you've been having trouble with the third gear synchro. Any update on that?

Talon ESI-T · 02-28-2006, 06:47 AM

Well my intentions are to Fix my talon trans (needs a new 3rd gear slowly getting worse for the past 4 years) then swap the brass trans into my talon to possibly isolate a vehicle issue. I am starting to suspect it could be a clutch engagement and disengagement issue. I noticed on the Black eclipse (brass synchro trans) that the clutch may not be adjusted as far as it needs to be. We'll see. I should be able the shed some light on that in the next few weeks.

I honestly suspect the problem to be in that car. Previous trans that had that issue was fine in the car it came from, the only limitation is that another driver had that trans when I sold it for a few months so I couldnt tell if he damaged it or not (I sold him a trans then bought his car months later). This week I will bleed the clutch and get some new fluid in the system then adjust the clutch pedal. May solve the issue. I fail to believe a new synchro is bad and if i bang real hard through the trans at high RPM's i can catch the synchro on 2nd and 4th. Thats why I am re-directing my focus.

Terry

baracuda645 · 02-28-2006, 08:01 AM

Talon esi-t, i would like to see the pictures of the of the tranny, i have a feeling that it wont be long before i have to do the same. thanks for the info as well

Talon ESI-T · 02-28-2006, 08:08 AM

Here is a few on my cardomain site. You can see in a couple the output shaft laid out on a towel and the input shaft laid out as well.

http://www.cardomain.com/ride/750788/4

Let me know what else you would like to see. Unless you know what you are doing, i dont recommend you take apart your trans. You will need a press to get the shafts out of the cases.

Terry