Black82Z

i was on www.HPTRANSPARTS.COM and looked at their boost valves and i wanted to know which one is the better one to have. I drive on the street, never been to the track yet, but beat the hell out of my car, i have shift kit, tranny cooler, will be getting super servo kit from HP but i would like to know which boost valve to get when i get it, i have no idea what the valve does, please enlighten me. thank you.

Black82Z

please help me people

Neil

The boost valve is located in the tranny pump. The larger the boost valve, the greater the fluid pressure, hence firmer shifts. With that said, i would go with the .500" valve, I have it in mine.

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1987 383 cu.in. IROC-Z: TPIS MiniRamIII / GM FastBurn heads/ 10.6:1 compression
Comp cams custom grind: Dur'n 224/236 Lift .536/.555
Strange 12Bolt Diff./ Neil's Home-Built BulletProof 700R4+Vigilante 2800 stall converter
MSD Billet Distributor, Dig 6+, & Blaster coil
Hooker Supercomp Long tube headers

Neil

BTW, where are you in Ontario? I used to live in London, Ontario.

transfixleo

It really depends on what you need. I wouldn't just grab everything that sounds like it will work better. For one thing there is a trade off for everything. The larger boost valve will wear the pump out faster and rob more power driving the pump. Also, while the Vette Servo will give firmer 1-2 and 2-3 shifts it also created more heat on the 3-4 clutches. The super servo will agravate that. When you say you have a Shift Kit, do you meaen a real TransGo Shift Kit or something like a B&M SIK? In many cases the .422 valve is just fine. Anything smaller than that should be replaced though.

[This message has been edited by transfixleo (edited May 31, 2001).]

Black82Z

Neil, i am in Belle River, which is just outside of windsor, and Transfixleo thanks for the info, so if i put in that super servo it will toast my 3-4 clutch pack, i have a B&M SK--- ya i know bad choice but i did not know about this site when i put it in, how long do you think my tranny will last with the super servo and the stock size boost valve, is it worth it for these things, please help i know little about trannys.

transfixleo

In my opinion, I would put the cost of the super servo towards a TransGo Kit.

Black82Z

LEO, can i still put that kit in eventhough i already have the B&M in there??? i would need a new plate between the valve body and the trany right??? i have no idea, but if the transgo kit is what you reccomend it is what i will get, i just dont want to ruin my tranny prematurely.

transfixleo

What year do you have? You could probably get a VB and plate from either another tranny (depending on year) or a tranny shop and use that as the basis. I am not sure what might be missing that the TransGo Kit might use so this way you would have everything.

Pro Built Automatics

Yes, the kit can be installed. You will need to get another valve body plate, (yours most likely has the 2nd gear feed over .110, way to big) What year do you have? You will need to match it up by the years. Here's how! 1982-86 use early style valve body and are interchangable. They have a single ID letter on the plate (A or B or C etc.) 1987 is all its own has a 2 letter ID on plate and the first letter is always an "A" (has an auxiliary valve body too). 1988-1992, has 2 letter ID on plate but with the first letter being "B" or "C" or "D" etc., and are interchangable. Never use one that starts with the letter "A" on 1988-92's. This should get you started. New valve body plates run between $10.00-$20.00. If you are interested in performance then install the larger boost valves. If you buy the Performance Shift kit from Summit(apx. $120.00) then the boost valves are already in the kit. If 2nd is still not firm enough then install the Corvette servo (apx. $15.00)
Hope This Helps!!!

JoelOl75

That's one problem about the B&M 'kit' that I personally experienced.

The check ball up in the case must occillate like crazy with the hole B&M tells you to drill. I installed the B&M in my friends 'bird' @ 80,000 miles. I bought the car off him @ 100,000. After removing the 'thrashed' trans and dissecting it I noticed the check ball above the hole has worn deeply into the aluminum ridge to keep the ball from going 'down the river'

It wasn't like that before the B&M and I got a new seperator plate and the recommended hole size for the setup I have is much smaller... and it's a very 'performance' shift setup.

The B&M isn't worth $5. There is alot of useful tuning tricks in it, but some are downright half-as)ed like solid spacers in the acc's.....

Everyone I know of with a B&M (myself included, join in the survey) loves it at first and then the 2-3 starts getting 'soft' to downright mushy after 7,000 miles or so.

TRAXION

Another quick note about the B&M crap kit. They block off the accumulators and drill out the 2nd feed too large (as ProBuilt pointed out). However, they *also* have you remove 2 checkballs from the case ... yuck.

I put this kit in a long long time ago before there was a general consensus about which kit to go with (before us thirdgen freaks knew about the transgo kit). I am lucky that my trans is still going strong ... but, you better believe that when I rebuild it that I am going with the TransGo kit and not this B&M junk. I just bought a spare 700R4 (1989 IROC-Z tranny)that I will be rebuilding myself with parts from ProBuilt (whenever I get around to call Dana to order the kit/parts).

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

Black82Z

the tranny i have is an 85, i got it out of a camaro that a guy was parting out, i got it for 250$ canadian, no problems at all. I have noticed that the 2-3 shifts are soft now, but they were never really hard to begin with, just faster. I think i will go with what you guys said and get the new seperator plate (if that is what it is called) and valve body, then install the transgo SK.

Is it hard to install??? and i think i will get the corvette servo as well, any pros and cons on that beside what Leo already mentioned above.

Another thing i noticed is that when i removed the pan to put new fluid in i noticed that there was, what looked like, metal dust in the bottom, is that clutch dust???? how bad is that because i dont really want to rebuild soon but if i have to i guess there is no avoiding it. anyway thanks for all the help

JoelOl75

The metal 'dust' (not snowflakes) are most likely the steel plates wareing in. Some is normal, but if there's alot there may be a clutch with the lining burned off. If your 2-3 shift is getting soft, maybe a refresh with the transgo kit may pay off in the end.

Black82Z

Hey Leo and pro-built, what is your take on this dust i found in the pan, it is only dust no metal shavings or anything big.

Pro Built Automatics

The dust is clutch/band material if it is black and does not stick to the magnet. It is not a good sign, and your trans will probably need to be rebuilt in the near future.

transfixleo

I think your soft 2-3 confirms what Pro Built said. I have seen TransGo Kits work just fine even if the clutches are no doubt a little on the dark side but they also have some nice parts that come in the kit that have to be installed with the tranny out so...

[This message has been edited by transfixleo (edited June 06, 2001).]

Black82Z

well, it is easy to pull the tranny and while i am there i might as well pull the engine at the same time and do a little work, couldnt hurt. The dust is only silver no black at all, but there is no magnet in the bottom of my pan but i have put new filters in it each year that i drive it. I dont know how bad it is right now but i will in the next few weeks when i pull it. So the transgo kit is the next on the list and i'll probably get the corvette servo as well, couldnt hurt i guess. Thanks for all your help, it has helped me alot and now i think i know what to do.

Pro Built Automatics

Sounds like metal, when it is out you no doubt will find what is wearing on close examination. Pick up a magnet at your local transmission shop that comes in the 700R4's, and put it at the marks in the pan (near the rear on the drivers side). Make sure that you use a factory Sealed Power filter.
Hope This Helps!!!

Black82Z

Thanks again pro built for the access to your vast amounts of info on this subject, I'll do what you said and what do you think about the boost valve??, is stock good enough??,or does the transgo come with a new one??? i'm ording the transgo tomarrow and i think it will be in by monday or tues. and i'll try to find a new plate. is the transgo SK hard to install????

Pro Built Automatics

Are you getting the Performance Shift Kit with a video? If you are, then the boost valves are already in the kit. If you do a lot of your own work on your car then this kit should not be to hard to install. Pay close attention to the instructions. Have access to an air compressor, a good electric hand drill, and a super clean bench with a gallon of solvent. Use the Blue paper towels only. (no lint) If at all possible have someone you know and who is familiar with automatic transmissions help you out on this. Be sure they like Trans-Go products first.
Hope This Helps!!!