Need a 1st synchro again!

[R-U-QUIKR]

Alright I've had my 95 Tsi AWD rebuilt twice now goin in next week for #3. This is the problem no matter what we seem to do I can not down shift to first at any reasonable speed. I think it is the synchro but why after two otherwise succesful rebuilds does this keep happening? Has this happen to anybody else?

 

[wastefuldreamer]

why are u downshifting to first? Thats what the brakes are for.

 

[wishIhadaturbo]

My car won't ds into 1st until less than 5 MPH. I don't think there is anything wrong with it, though.

 

[R-U-QUIKR]

I happen to know enough about transmissions in general to know that in any transmision you should be able to downshift to first when you are at 1000rpm in second. As far as wasteful dreamers input goes have you never in your life ever rolled up to a red light in second and almost stopped but the light turns green and your rpm's are to low to be in second SO YOU LOGICALLY DOWNSHIFT TO FIRST as apposed to slamming on your brakes to make a full, and neccessary stop! Thanks anyways.

 

[Defiant]

Originally posted by R-U-QUIKR
I happen to know enough about transmissions in general to know that in any transmision you should be able to downshift to first when you are at 1000rpm in second. As far as wasteful dreamers input goes have you never in your life ever rolled up to a red light in second and almost stopped but the light turns green and your rpm's are to low to be in second SO YOU LOGICALLY DOWNSHIFT TO FIRST as apposed to slamming on your brakes to make a full, and neccessary stop! Thanks anyways.

If the car's moving at all, it's plenty fast for second gear. You can easily use second to start from a dead stop, for that matter.

There's nothing wrong with your gearbox apart from the top end of the gearshift knob, and the uninformed person attached to the hand trying to manipulate it.

Perhaps you should learn to walk.

 

[NJGSX96]

Originally posted by R-U-QUIKR
Alright I've had my 95 Tsi AWD rebuilt twice now goin in next week for #3. This is the problem no matter what we seem to do I can not down shift to first at any reasonable speed. I think it is the synchro but why after two otherwise succesful rebuilds does this keep happening? Has this happen to anybody else?

You say "successful rebuilds" but you can never go into 1st. Doesn't sound successful. I am assuming you replaced the 1st gear syncro each time? When you pulled it apart, did 1st look worn? When you pull the tranny apart, do an inspection of 1st gear as well as the hub/sleeve. Could have some chipped/cracked/broken teeth on these parts. Also, did you shim the transmission to spec?

In the end, you should be able to downshift into 1st at 1000rpms or as high as 10MPH.

 

[mrmadmax]

Originally posted by R-U-QUIKR
Alright I've had my 95 Tsi AWD rebuilt twice now goin in next week for #3. This is the problem no matter what we seem to do I can not down shift to first at any reasonable speed. I think it is the synchro but why after two otherwise succesful rebuilds does this keep happening? Has this happen to anybody else?

So how many miles are on this tranny? One thing that some people fail to realize in their trans is that the "synchro" is not the root of all shifting problems.

1) Are you using the factory recomended trans oil (bad), or are you using the G.M. synchromesh oil like you should be?

2) The term "synchro" is short for Synchronizer Assembly. It consists of a steel cone (part of first gear in this case) that the brass blocker ring rides on, the blocker ring (brass part that most people call the 'synchro'), and several other metal bits and springs. The point is, the steel cone on first gear may be worn slightly, which won't let the brass blocker ring engage it very well. This wear is not always there, but I have seen it on a few trannys. If you have the funds, replace the 1st gear blocker ring and first gear as a set if it's a high mileage trans.

3) Use good parts, i.e. Mitsubishi if you are unsure of the quality of the ones you are getting.

4) Is your clutch disengaging all the way? How does it feel?

 

[R-U-QUIKR]

So we pulled the tranny today and found out that first gear which is new, was faulty and had actually cracked and lost a few teeth. No big deal just replace it. NJGSX96 when I said "successful rebuilds" I meant other than first( second, third).I should have clarified. As far as defiant's input goes please do not give input that is not useful to solving the problem especially when it is incorrect "There is nothing wrong with your gearbox." If you have no direct experience with this problem then just keep your ever so witty comments to yourself. And as far as being uninformed you should probable no that I am finishing my second year apprenticeship. Yourself?

 

[NJGSX96]

mrmadmax, you are the first person I have seen to call it a blocking ring! Finally! Thank you for showing me that there are people that do know the correct terminology.

r-u-quikr,, I misunderstood. After re-reading your orininal post, it makes perfect sense. Sorry 'bout that. Anyway, sounds like you may have found the problem. When you get her back together, let us know how it shifts.

 

[Defiant]

Originally posted by R-U-QUIKR
And as far as being uninformed you should probable no that I am finishing my second year apprenticeship. Yourself?

Ten years mechanic.

Any guesses what broke your first gear? Hints?

 

[Saber_TF]

For my 1g, i can't downshift into 1st gear until i'm going 10mph. Any higher then that i'll grind it...

Saber!...!...!

 

[R-U-QUIKR]

You know for someone who has been a mechanic for ten years I can't even fathom you saying somthing as stupid as there is nothing wrong with the tranny. Also if you are a ten year mechanic where is your mechanically knowledge, I mean why not give a person useful mechanical insight which I would hope you would have as opposed to saying that there is nothing wrong. My point is if you are a mechanic you should have realised something wasn't right. First gear is damaged because 1/2 fork is bent and has been the problem since the beginning but was overlooked. DEFIANT, I would appreciate if you would stop wasting my time by posting to any of my threads because these forums are for info and help, Not useless shooting in the dark opinions. So if you don't have a helpfull or informative thing to say keep it to yourself instead of misleading anybody else who may read the post. P.S. I ain't trying to start trouble with you but your original post had no info and was ended with a really grade 3 like insult!

 

[raped]

when you break first gear you will usually know. Was the car clicking in neutral with the clutch engaged? It must have been clicking in 1st gear. Did you open the tranny yourself or did somebody else open the trans and tell you first gear was missing a few teeth?

 

[R-U-QUIKR]

I had the work done by the local shop, but I was there when they discovered the teeth missing. It was actually the most damaged gear any of the transmission mechanics there have ever seen. They think the gear itself was not properly manufactured. As far as clicking, I noticed it clicking in first but not neutral.

 

[raped]

i just rebuilt my trans due to the same problem. But the gear broke because of incorrect end play on the input shaft. I dont really understand how a bent shift fork could cause broken teeth.

 

[Defiant]

Originally posted by R-U-QUIKR
I had the work done by the local shop, but I was there when they discovered the teeth missing. It was actually the most damaged gear any of the transmission mechanics there have ever seen. They think the gear itself was not properly manufactured.

Did their eyes get all big and round when you told them you had trouble shifting down into first? Or did they know to suspect "abuse".

 

[set3422]

check the pressure plate and clutch disc. My disc separated in half and had the similiar symptoms you described. Good luck.

Originally posted by R-U-QUIKR
Alright I've had my 95 Tsi AWD rebuilt twice now goin in next week for #3. This is the problem no matter what we seem to do I can not down shift to first at any reasonable speed. I think it is the synchro but why after two otherwise succesful rebuilds does this keep happening? Has this happen to anybody else?

 

[Maxximillion]

When I downshift to first I have to go to third first! I havent ground any gears since! Also works to get to reverse!

 

[c0degsx]

i was reading around tuners one day and i came across a thread similar to this, the people said that 1st geard does not have any syncros. hope that helps, dont flame im just saying wut i saw.

 

[raped]

there is a synchro for first gear

 

[R-U-QUIKR]

The only gear that doesn't have a synchro/blocker ring is reverse.

 

[raped]

Originally posted by R-U-QUIKR
The only gear that doesn't have a synchro/blocker ring is reverse.

It has a synchro but it is on the opposite side of the trans by 5th gear.

 

[Defiant]

? ? ? No, DSMs do not have a synchronized reverse. VERY few things ever built do. There's no point in it: tap 5th, slide back into R.

 

[R-U-QUIKR]

well for once I agree with you defiant. Way to go, I'm so impressed that you put in your two cents and you didn't even insult anybody! !

 

[Defiant]

Oh, I'm a big teddy bear.

Then I sober up. sigh.