91z28ss

iTrader: (4)

So I guess I am not done with my car...stroked the engine last year, redid almost everything from the rear end to the front end with all the "high end" parts out there! Had my 700R4 done couple years ago with a B&M stage 2 overhaul kit including Corvette servo with a TCI converter and now:

my transmission started to slip yesterday on O.D. I was driving around 50mph at maybe 4000rpm (wrong tach reading +1000 at least) and when I hit the gas, the RPM went to the redline at 7000RPM but the car hardly moved!!! And then I rans the car for another 20 minutes and it shift correctly in O.D. without hitting the gas too much, just "normal driving" condition...

So I assume that my tranny is starting to roast am I right? My friend who is an ex-GM technician cannot help me because he is way too busy! What should I do now? May I still try something else? Don't tell me to verify the fluid it's perfectly leveled.

Is it worthed to rebuild this transmission or just buy a new race serie? My technician told me to avoid B&M and TCI trans because they are just as good as generic one's...

All thanks for your suggestions

91z28ss

iTrader: (4)

So I took it out for another road test yesterday just around the blocks and the transmission seems to slip on every gear change when I give it a good amount of torque...When I drive it slowly without pressing on gas pedal too much, every gears came in right as it should. My tires even spinned between the 1st and 2nd gear!

My technician suggested me a good rebuild shop, but I am not completely sure about investing a lot of money that will probably won't take me far...In addition, he hardly suggested me to get a Vigilante converter instead of my B&M's one, All together, I am sure it will cost me around 3000$ if not more.

I called Hawks for a complete T56 swap, with a rebuilted trans, better clutch and everything it would cost me close to 5000$!!! I am not really manual oriented in this such work, so

what do you guys suggest me now

bwiencek

First thing to do is check the line pressures to make sure you're not fighting a simple low pressure issue not being able to hold the clutches.

Then if it's still slipping - it's time for a rebuild...

zz top 34

my 7004r was slipping badly in first and second after driving it for a while.the linkage on the throttle body had slipped causing low vacume to tranny.its worth a shot.

Reid Fleming

iTrader: (2)

I'd bet money that the TCI converter died and filled your transmission with broken junk.

http://ls1tech.com/forums/automatic-...education.html

91z28ss

iTrader: (4)

Yeah I now know that the TCI converter isn't any better than a rebuilted OE unit... I just bought a Vigilante 3200! My car is just sitting for the past 2 months :-(

The trans is still working in 1st & 2nd gear, and it does strongly! But won't change into 3rd speed, and forget about the overdrive! I verified the TV cable and it is adjusted properly. And the oil pressure is still good. I think it is time for a rebuilt. I am doing my homework and gathering all the information for acquiring the best parts for a real bullet proof 700R4 or I might just order a rebuilt one from a renown shop.

Any advice, knowledge or experience ???

bwiencek

Sounds like you lost the 3-4 clutch pack, although usually it will attempt to shift into 3rd and then slip. Since you don't say that it even attempts to shift into 3rd then you *might* be lucky enough that it's just the governor that's stripped, sticky or leaky (pull it out, clean it and make sure it's operating smoothly)

Pro Built Automatics

If you have 2nd gear at normal speeds, then it is not the governor. The 3-4 clutches are most likely the culprit here. If the transmission does not have a lot of miles, you could possibly upgrade the 3-4 clutch pack and do a couple of other things here to make it last.

91z28ss

iTrader: (4)

The transmission has around 15K miles. My friend will open it next weekend and investigate it further. I am thinking about ordering an overhaul kit for it, is it worthed at this point? I really want to do it the right way this time! I am tired of loosing my car for the summer every GOD damn years......

bwiencek

I would hold off ordering anything until you figure out what's wrong with your tranny, if it's a good re-buildable core still (it's likely it is), and you make a plan for all the components you need to be able to handle the power (somewhat) reliably... If you're pushing any sort of real horspower and torque out of the 383 (and using it) then you'll be eating 700's unless you spend time and money to build them right - parts can get a little pricy so you really have to think about going to a 4L80E if you want ultimate strength/reliability vs spending money on a 700R4 that might last another 15k miles...

91z28ss

iTrader: (4)

With that said, how much more would the 700R4 cost me over the 4L80 electronic software to get? I was thinking about swapping for a T-56 but over here, not a lot of car shop would do it unless you pay big money!!! I was quoted at one good local speed shop ``Zekes automotive`` previously SLP Canada, for 7000$ for the complete swap using a used trans. My friend who does all the mechanics on my cars says he won't be able to do this kind of swap because it's time consuming and a pain in the a**!!!



I am not sure in which direction I am going yet but I must admit that I am mad at investing a lot of money over the years without truly enjoying her...

91z28ss

iTrader: (4)

But thanks for your advice and I will let you know which internal parts were damaged when my friend open it, probably next week...

bwiencek

Either swap is not going to be something a 'regular' shop will even want to do - you'll need to find a performance oriented shop or even someone that does restorations with modern drivelines - or better yet learn to do it yourself. Neither swap is particularly difficult if you purchase the proper conversion parts - you can either spend money for pre-made parts and controllers or you can spend time fabricating and wiring and programming (i.e. building a megashift box and harness to control the 4L80E vs using a 'plug in' FAST TCU contoller)

hellz_wings

iTrader: (2)

I just noticed ur in Montreal (and you mentioned Zekes). I've been bringing my car there for the past 7 years and to be quite honest, I like the guys there (Doug and Claude). The guys that usually worked on mine (back in the day when they did most of the work on my car) I think were Bobby and Joe. One of them even owns a thirdgen I think. I got my tranny rebuilt there.. Well actually, they don't do the rebuild themselves, they have a very reputable guy, his name is Serge (I think his company is Serge Transmissions) and he's up north somewhere. He rebuilt mine and all in all it costed me 2700$ (500$ for labor and 2200$ for tranny rebuild). They fixed everything that needed to be fixed (although I was pissed off because mine is an 86 and it still shifts sorta rough from Park to R or D, but wtv small details). Performance wise, it's been a crazy strong transmission and reliable since I got it done in 2009. Wow it's already been 4 years!! It shifts like it was new and I raced it tons since (although I have a smaller 305, it has alot of torque and HP..) .. If I were you (and you could do this) I would remove the tranny, call Serge and bring it to him yourself. I can give you his number in PM if you'd like, lemme know.

And yeah, Zekes is a little pricey, but they do a good job.. If I had the equipment I have now (and the garage to work in) I would not have spent all that money over there that I did over the past 7 years.. Live and learn!

91z28ss

iTrader: (4)

Yeah I know they do a good job for sure, but a little over pricey! I will always remember when I had them intalling my dual SLP CAI (purchased from them when they where still SLP Canada), their estimated price went from around500$-750$ to an incredible sum of 2000$!!!!!!!!!! I said WOW, I am installing a cold air here or a supercharger!?!?!? I have been the couple times, but even if they are reliable, they are seriously overpriced! I know that they use to send their transmission to Autopital in Ile Bizard, I had my torque converter redone there once, he is a good tech. No offense here, but I only go to Zeke's for a dyno run or to purchase some little parts when I am in a hurry. Otherwise, I always order everything from the US and my friend and I install them...

I can remove the trans and re-install it myself, just can't rebuilt it! I was searching on the net and found some level 3 transmission with a 2 years warranty for under 1700$ + 200$ shipping fees, no core charge. I may end up with this option, keeping mine as a spare one and rebuilt it the right way! Maybe for another project.

By the way, I think I already saw your car there once, I have been dealing with Claude for 17 years now for my friends and some advice too, they know what they are doing