420a tranny question. no clue what it is

[greenDSMdude]

ok so i seriously need some help with this. my car grinds going into second gear. ive come to the conclusion its not clutch. i got no idea what it could be.. slave cylinder? something.. my friend told me it could be my second gear synchro is that a common problem with our cars? im just wondering what it is so i can get it fixed to prevent further damage. again the car only grinds shifting into 2nd until the rpm's are low enough then it does not. any suggestions would help me out alot thank you in advanced!

 

[southrneclipser]

throw out bearing

 

[rlacasse1]

throw out bearing

No. If it were a throw out bearing it would be anytime he steps on the clutch that he would notice it.

 

[DSM1G90]

Wooo...! 1 and 2nd gear syncro is toast.

Do this trick: with the motor idling and in neutral, move the shifter to each shift point without dumping the clutch.

If the motor slows down when you gradually push on the shifter to that gear, the syncro is braking down the input shaft of the tranny.

But, if you get a nice and juicy grind, the syncro is toast and tranny is due for an overhaul.

Good luck - DSM

 

[greenDSMdude]

and im not sure if it means anything but when i start my car you can hear a rattling noise until it warms up. i don't know if that has to do with the trans at all just looking to diagnose it. and god i hope the synchro's aren't f***ed up. if they are would i be better off buying a whole new tranny or re-building the one i got now?

Wooo...! 1 and 2nd gear syncro is toast.

Do this trick: with the motor idling and in neutral, move the shifter to each shift point without dumping the clutch.

If the motor slows down when you gradually push on the shifter to that gear, the syncro is braking down the input shaft of the tranny.

But, if you get a nice and juicy grind, the syncro is toast and tranny is due for an overhaul.

Good luck - DSM

but wouldnt it always grind if you just jam it forward without the clutch? if in neutral? past couple days i have been driving it no clutch except for taking off. in that case it wouldnt grind but just jamming it forward? WTF im not saying your wrong just i guess i dont understand what your saying

 

[DSM1G90]

im not saying your wrong just i guess i dont understand what your saying

Now, if you're driving without clutch means that you're basically driving what's called a "dog box" tranny - tranny without any syncros in it and using the throttle and shift syncronizing technique called "speed shifting", which is the same thing that bikers do when upshifting or downshifting without clutch.

Dang, that's not good on syncros at all.

No, The synchronizer drives a cone shaped metal piece against the gear and starts the gear spinning. It accelerates it to the speed of the output shaft. When the gear reaches the speed of the output shaft, the synchro meshes completely with both of them and directs drive through its splines from the gear to the output shaft or vice versa. Their job is to connect the gears of the transmission to the shafts that they ride on and lock them together. This must be done at a gradual rate or the gears will grind.

It's the cone section of the syncro that causes the motor to gradually reduce speed with the test that I mentioned earlier.

You just barely push the shifter to each gear and as before: if the motor slows down a bit, syncro is good. But, if it begins to grind, syncro is shot.

if they are would i be better off buying a whole new tranny or re-building the one i got now?

Tough call on this one - all depends what they find inside when they bust it down. Just that on a rebuild, everything is new inside where you basically have a new tranny anyway.

Now remember: You have a Chrysler tranny, not a DSM tranny if you're NT with a 420A motor. AND, if and when you do the tranny, from then on - please use the clutch.

Good luck-DSM

 

[born2tune]

try getting the clutch you want for your project now, youll be better off.

 

[greenDSMdude]

i tried that out and yeah second gear ground like a champ. so im guessing its bad but before you said 1st and second? or just second gear synchro?

 

[95talongirl]

sounds like a syncho problem to me, too. The chrysler transmissions were known for 2nd gear grinds. I know the dsm version of the trans is hydraulic, but you *can* use one from a dodge neon (NV-350), which you might be able to find cheaper. I've seen people swap 'em over. As for as detail, I'm not positive on if they kept the hydraulics or whatnot. I know the 1g neons (95-99) were cable driven and the 2g (00-05) were hydraulic.

Good luck tho!

 

[DSM1G90]

but before you said 1st and second

You have a set of syncros per pair of gears since those pair are on one shaft each. Thus, 1/2 has as set, just as 3/4 has a set with 5th having it's own. Reverse doesn't get one.

 

[david-b]

and im not sure if it means anything but when i start my car you can hear a rattling noise until it warms up. i don't know if that has to do with the trans at all just looking to diagnose it.

Mine does the same. It goes away when I push the clutch in though. Done this on 2 trannys, 3 different clutches. Seems no one knows what this "problem" is. Never had an issues with it though besides being annoying.

 

[greenDSMdude]

well if its a synchro problem how do i go about getting parts to fix it?

 

[southrneclipser]

if you get a neon transmision, you have to use your bell housing from a 1g neon.

 

[greenDSMdude]

id rather not get a new tranny and just build the one i got. but where can i get some new sychros?

 

[DSM1G90]

Head to the Mitsu service dept, or do an online search for syncros from 3rd party manufacturers.

 

[greenDSMdude]

my moms, co workers, nephew i found out has an eclipse its broken down idk what trim it is or whats wrong with it. im assuming an RS or GS cause they are common and no clue whats wrong with it. but im gonna try to score it for cheap so theres a good chance i can get a tranny from that and all the other little odds and ends i need for my car. wish me luck! praying its a gst or gsx