Since I wasted my 700R4 at the track yesterday I have to make a choice:
rebuild the 700R4 for now, or swap it out for a 'Glide or Turbo 350. This car has already been 10.90s @ 124. Over the winter I intend to go to a 9" w/ coilovers & 4-link, solid roller, put it on a diet, etc.

I don't know how to do a poll, but would like everyones input,
Thanks Dave :confused:

 

Dave

Sorry to hear that!

If you'd like to do a poll, when you make a new topic, it'll say new poll. Click on that and it's pretty straight forward from there.

How quickly did you go? I say, for now...pop another 700R in it. All that torque sure does make it rough on parts! :cheers:

 

Thanks JD,

I just posted a poll in this forum. It went 11.14 @ 122.3, 1.502 60' w/DA of 3200 & slipping in first! When did you get Welds? Were they JPs? I might have some rears available in the near future for you!

See 'ya, Dave :D


[Modified by new92racer, 12:47 PM 9/15/2002]


[Modified by new92racer, 12:50 PM 9/15/2002]

 

Hi Dave

Yes, skinnies are John P's...or used to be. The rears ironically are Bill C's. :)

Sorry 'bout the bad luck, it happens. Your whole driveline has to be brutally tough to take the kind of torque your engine puts out. That's part of racing though.

Keep me up to date on the rear pro stars. :eek: I hope they're not the 28" tall :D

 

Have you run your Vette across the scales at the track? What is the race weight with you in it? If you are comfortably near 3,000 lbs I would go with a 'glide. If you are more towards 3,500 lbs then I would give the nod to the TH350.

Here is my understanding of some of the limits/guidlines to the different GM auto trannys properly set up for drag racing. When I say properly prepped I do mean billet shafts and such when and where available.
Up to 1,600 hp and under 3,000 lbs = 'glide
Up to 1,200 hp and over 3,000 lbs = TH400
Up to 1,000 hp and over 3,000 lbs = TH350
Up to 800 hp and over 3,000 lbs = 200 4R
Up to 600 hp and over 3,000 lbs = 700R4

Once again before anybody picks on the above, this list is for race prepped tranny's with all the good aftermarket internals.

700R4's in particular have a hard time with extreme rpm (7,000+ rpm), especially hard on the 1-2 shift, because this trans has the most gear ratio spread between 1-2.

Thomas

 

JD,
Those rear wheels look like they're off a Pontiac, can that be? Are you looking for a set of 28" tires? I may have a set of 325 BFGs with about 10 runs on them for sale soon, btw, they bolted the '92 down, super consistent. I hooked up with a stocker friend of mine at Maple Grove the other day and made a deal for his used 9X30 Hoosiers. I plan on mounting them up and seeing if they clear everything. I'll try them out if they do, maybe even put in the 4.09s, after all, have you watched how these stockers leave? Even the big torquers are bolted, so I should be able to break everything then.

Rocket,
I think you're headed in the right direction with that chart, no matter which one I pick it will receive a full race prep with all the hardcore parts. I assume my car weighs about the same as what I've read about other C4s. 3200-3400 since I took off some of the unneeded items.


[Modified by new92racer, 10:55 PM 9/15/2002]

 

Regarding your trans selection, my choice would be a trubo 400. Stay away from the power glide It is solid but is probably not going to fill your specific needs without spending big bucks. I was concerned at first since all of the trans that you mentioned would have to be modified to accept the c beam. But you state that you were going to a four link. So I assume that you will modify the frame to accept a cross member to support the rear of the trans. I really like the 700r4. However, many I know keep having trouble with them. Some have had good luck while others seem to blow them up. I also like the turbo 350 since they usually come with a lower first gear ratio in stock configuration. My recommendation is to find a trans builder that has alot of experience. It seems like the key to success in finding the right trans is to find a builder who can build the unit specifically for your application. With all the aftermarket parts out there to tailor a specific trans to a number of applications, you could probably build any GM trans model to fit your needs. I have seen all of them in race trim that could easily handle 1000 hp. That is more than most of us will ever see. So finding a builder that will find the right combination of parts which includes the torque convertor is going to be the top of your list of priorities. I would find someone who is running a comparable setup and ask him who his trans builder is. I would then go from there.

:cheers:

 

Am I understanding correctly? You're planning on putting 4.09's in the green car? That's a no no.(If you we're thinking to do so) Sorry if I misunderstood...not sure if you have another car you're mentioning.

Those big DR's seem to work well! Our fellow L98 pal Ralph continually hits the 1.6 zone with his H-C 350 on 325's. Not too sure how much caliper I'd have to grind off to fit the DR's. Shoot me an e mail on what you might ask for them. It's in the sig.

Thanks.... yes the rear wheels are Ponitac Firebird wheels Bill C got from LPE. The slicks are discontinued now 26X10X16.

 

JD,

Ya' think 4.09 is to much gear?????? Even with 28 or 30" tires??????? I guess you'll really choke when you hear whats planned for this winter!!!

I've got the 28"s on the car now and the thing is loafing at the traps(approx. 5,400), it could use a few more R's. BTW, I went to my trans guy today, he said bring in the 700 and he'd fix it up to live again. He's friends with Carl Rossler and knows his work well. I may be putting a bandaid on a brain tumor, because I just don't think the 700 will live as a racing trans. There's going to be a P'glide or 350 in the future for the greeny one!

I'll email you on the tires soon.

Dave :cheers:

 

Dave - What exactly broke in the 700R4 ?

Thanks

Vic

 

Hey Dave...

I think the 4.09's with a lower revving L98(Especially a torque monster like that) doesn't need that much gear, even with a big tire. I go through the traps around your range as well(A little higher with street tires). I can only wonder what you're planning for the winter months for the mean greenie :D.

Hopefully your tranny will hold up for a little while. It's tough with all that torque....and your 60's! The poor thing is crying the minute you mash the gas! :). A 350 or glide will certainly be more reliable. Not quite as streetable...but you want to RACE the car...so those are better suited.

Thank you for the update. I was hoping to see the car at E town this weekend. I 'spose not eh? ;)

JD

 

if you were planning on keeping on the street, i'd probably vote for the 200, but given it's race only status, i'd go with the 350. Strong, light and better ratios for drag racing.

 

Vic,
I just got the trans out this afternoon and dropped it off at my friends shop, it'll be ready Thursday evening. I'll update this post as to what the carnage is.

JD,
I'm going to set the car up over the winter for a P'glide and a T350 so I can try both. Being the torque monster it is, a 'Glide may be the ticket, but I'd miss that first gear surge. As much as I'd love to be there, I don't know if I'll make Etown by Saturday, maybe next month.

Ralph,
I first thought the M200 would be a great fit with the 2.75 1st until I figured I could do the same thing with a T350 cheaper & stronger. If needed, I can put a 2.75 gearset in the T350.

Hope to see you guys again soon, Dave :cheers: