Hi guys,
my name is Sebastian.and i came from Slovenia/Europe.my frient Sammy from Chile suggested to write here...so i did it..I own an 86' corvette and i wanna rebuild my transmission.So i hope you guys can help me out hehe..since i have already bought quite all pieces, but anyway i deicieded to write you a few lines...
Like i wrote Since i bought a lot of parts i wanna do it by my self so i hope you guys would help me here...
I would like to build a transmission that will hold 700HP, since i will late change my heads and rebuild also my engine but first i have to do the transmission...i red on some pages that you do some modifications on parts that will lube better..''The front sun gear is then slotted for improved lubrication, as the rear sun gear was, and installed.'' is this a secret or can someone shere this with me...
since we don't have good mechanics here to do proper work and after this the only one mechanic rebulded my transmission for 5 times and i always burned up 3-4 gear, i decided that my friend and i do this on our own..he allready rebulded his trans on his pontiac firebird and few others...and they all works great..so here we go...

i have this parts:

-sonnax super hold 2nd gear
-sonnax super hold 4nd gear
-trans go kit is this a good choice?
-alto red clutches or reybastos Z-pack which do you recomand more?
-sonnax sure cure kit is this worthed?
-Reaction Sun Gear Shell - Modified (Beast)
-700R4 / 4L60E Rear Planet , 5 Pinion
-oil cooler DERALE how big to work alone/without original cooler?
-alluminum oil pan DERALE
-13 vane pump
- new stronger pump support shaft SONNAX
-trans core MD8 year 1991( is this a good core?) or to use my original 86'' core...i can't find any K case core..i think that 88' up trans were better..what do u think?

please if you can sugest me what to put in that my trans will work good and will not burn out?..and which oil you sugest?
and i will need a new converter..which do you recomand for street and streep?

this will be for now all...i hope that i can get some information from you

BR, Seba

 

 

Although the K case is slightly better than an 88 and newer standard case, they are not desirable. Use the later model core you have.
I have only seen them in 4wd trucks. Every single one I have run across, had the internal spines (that hold the lo-roller clutch in place) beaten out of them. I gave up looking for them, and I have many resources in the States.
Use the search feature, and you will have days of reading. Many photo documented builds were done here in recent years.

 

Keep in mind that this trans is a medium duty unit from the factory. Currently, no amount of upgrades will allow you to put 700 hp through it for long periods of time. Expect to freshen it often.

 

86PACER where can i get this?

ok...thanx for informations for now....i hope for some more infomations also by other members...i will look also in italy..i now the guy who has a lot of 4WD cars and transes for sale...anyway i can still use the 91'' corette core...

ok..i will keep this in mind..but why then performabuild guys offer an TH700/4L60 transmissions with 800 RWHP at lvl 3...take a look here.... http://www.performabuilt.com/gm%20pe...d%20truck.html

BR,Seba

 

The intention of my post was to provide you with free, accurate information based my my track record of building 100's of these transmissions for vette's and other gm performance cars. I also race them.

Perhaps Performabuilt is wiser than me, and can best answer your questions.

 

And just to be clear, Performabuilt is located about 20 miles from my home. They build a good trans, and have a solid reputation in the US. I have been inside a couple of their transmissions, and they definately build one right. If I lost both my arms in an accident, I would go to them for a trans.

With that said, don't belive everything you read for advertising.

I could pee in a cup, and sell it as lemonade, but that does not mean it is lemonade.

 

Pete do sell perfomance 700r's anymore?

can they be made to perform on par with 4l60e's as far as shifting control and optimization?


http://www.transmissioncenter.net/700MegaRaptor.htm

 

Unfortunately, no to both.
There is no way for a governor equipt trans shift to have the custom tailored shifting options that an electronic trans would.
A non electronic trans can have the shift points tuned, but not as perfectly as an electronic unit.

 

thanx a lot pate...please is possible to get your email(PM) and maybe you can suggest me what to put in my trans or however modify it to ger max performance out of it..

BR,Seba

 

That being said, to make an "e" work ,there would be a substantial premium( the aftermaket copntroller ) for my 89. So with the cost benefit analysis, is the shifting quality i.e. timing, of the "e" trans 30% to 50% better? or could the 700r4 be made to address most of my driving enviroments/scenairios, FWIW, I like on ramps, and roll on's both the teach rustangs and get away from stupendous drivers.

so no Auto X and no drags ever....

 

I never looked at it that closely. If it shifts from 1-2 2-3 3-4 firmly and solidly, at an approximate rpm I want, it is good enough for me.
If you are looking at shifting that closely, it is beyond my ability to comprehend.
My suggestion is to drive one like yours with an auto, and see what you think.
I would never invest that much time in my busy life regarding shift timing.
Life is too short. Just my 2 cents.

 

Thanks for your 20 bucks, sometimes I split the wrong hairs, the 700r4 will do the trick then, and let the TV valve do the job, I guess when its all done and said, Performabuilt level one with the 2 year with no mileage and race warrantee would be the way to go...can something like that be had from another reputable builder for less? Do they all do the same tricks,(like the four slots machined into the sun gear) to acheive a hp capacity/limitations goal? or do some have different mod preferences over another and result in a different "feel" and durability?

I remember over at GURU, you mentioned a stock low mileage can do the trick for me, that would diffenately save me a bundle.....

 

Trans builders as a whole are funny. If you ask 10 different, quality builders to tell you what the best parts and clearances (blueprinting, oiling mods etc) all 10 would likely disagree. For example, I have had outstanding results with relined, kevlar bands. Never once a failure. Yet many builders will tell you they are crap.
Like engine builders, trans guys will never reveal all of their tricks.
I run 400 hp through a mild built trans that most would say could not hold up. Yet it does. Blueprinting is key, anong with careful parts selection and oiling mods.

 

Pete K,

Thank you so much for providing us all here with your knowlege about trannys and driveline type stuff.

You are such an asset to this forum. I have learned much from your posts.

In other words, Pete, you ROCK!

Corvette Mike

 

hi...do you have some pictures of this 4 slotes in sun gear?this is mode for better lubrification as i know isn't it?

hi pete..thanx a lot for all the help here...since you have a lot of experiences and i have small possibilities to buy rebuilded transmissions ..then also i have had very bad exprience with local rebuilder which repaired my tramsmission for 5 times and there was always the same problem...burned 3-4 gear...and since i spent more than 3k $$$ for this..i will do it alone with my friend..so...please, can we have a few words in private..email or skype if is possible?
thanx again
BR,Seba

 

Sebastian,

Have a look here:
http://www.corvette-guru.com/modules...forumpost99501
It is part 1 of a 5 part series.

With the exception of the aftermarket planetaries, I would build something like this. GM 4 pinion planets are likely fine for your application. I chose the different ratio's because I wanted to experiment. If you are running nitrous or a supercharger, you may want to use a steel reinforcing sleeve kit on the input shaft.
Until someone comes out with a billet input drum/shaft combo, that is a weak link for boosted stuff.

 

Pete thanx very much for this infomations..if i will have som questions i will ask you if i can?...
just for information...i have for now 3 core posibilities..the one i have on my corvette is an 86' corvette core, then this 8YMM139C MD8 which is an 91' corvette core, and anotreh 86' core i bought some years ago and has all new moving parts inside but needs to be freshen up with numbes 6YDM-Y-00402991009B..which do you recomand to rebuld?
thanx for all..BR, seba

 

You are mistaken about the 91 unit. Although it may have been removed from a 91, it is in fact a 1988 model year that was born in a 1988 camaro, or firebird. That is the correct unit to build up.

 

realy??thanx fror this...i will search for others since this unit has a crack in the case..i saw this now..so i will see...i have to visit also the italian guy to see if he has some K case, but he is very expensive....







if i buy this i will see if is possible to repair this when we open the unit..so i am not shure about this..

thanx for all...BR,Seba