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Old 05-12-2009, 04:39 PM
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set up opinions on 700r4/3k stall/ ? gears

i have a 87 camaro w/ the 700R4, i plan on pulling this out and purchasing a mega monster 700R4 and a 3000 stall to go with it, i have a 385 sbc with an est 440hp/460tq, i still have the 7.5 10 bolt, which i know is garbage, but i have seen and heard of people getting into the low 11's with slicks as long as the had a better than stock carrier in them im want to run a 4.10 gear but im told that this is way to low for the 3.07 first gear, i will be running a 28X10-15 tire, i guess i would be willing to go as high as 3.73's

this is no daily driver, occasional weekends with some strip time,

i keep getting told by everyone to get a th350, and change out that 7.5 to a 8.5 or 9"

the rear im told is crazy hard to swap out with another rear not meant to go under this car because of the torque arms, i have been advised not to do this by another guy who has a 82-92 f-body, but then strange and moser offer a 12 bolt made as a direct fit for this car but its $3200.00, that's stupid crazy expensive for a rearend!!!!!!!! when all the parts dont cost more than about $1500-1800, what is there labor rate!! like i said stupid expensive

what are some of your opinions and suggestions on rear, trans etc

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Old 05-12-2009, 07:11 PM
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wow no opinions
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Old 05-12-2009, 07:50 PM
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Quote:
Originally Posted by my87Z
wow no opinions
Give it a little more time, most folks here are still working for a living.

Vince
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Old 05-12-2009, 09:42 PM
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Generally you want about 10:1 ratio for a drag rear. Trans 1st gear X rear ratio. 3.06X3.42=10.46, With the 700R4's 1st/3.06 to 2nd/1.62 gear ratio drop you need a little more rear gear to overcome the 1st to 2nd rpm drop or wind the engine up more.
Here's some Rears, just add your own center section/ 3rd member & brakes. >>>>>
http://www.quickperformance.com/Products/housings.htm
http://www.9inchfactory.com/boltin.shtml
http://www.dutchmanms.com/
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Old 05-13-2009, 09:23 AM
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Hello,

I have an 87 Firebird that is a pretty similar setup to what you are running. 30 over sbc 400 that should be putting out somewhere between the 400-500 hp range. You are correct in saying that it is crazy expensive to get a bulletproof rearend for one of these cars. I am running the stock limited slip rear with a 3.73 gear change and its working pretty well for me so far. I probably have 40-50 passes at the track so far. If I could just get the trans to shift right I would be even happier. I run bfg drag radials at about 15 psi and I rarely have any tire spin. My 60 foot time is usually in the 1.8 range and my best overall so far is a 12.40 @ 112mph. With the overdrive trans I can still drive it to the track at 2850 rpm down the interstate. I think you are on the right track with the 3000 stall too. I opted for the 2400 and I should have gone higher, especially if you say it won't get a whole lot of street time.

Well now you have my two pennies, hope it helps
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Old 05-13-2009, 03:23 PM
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Quote:
Originally Posted by 87FBomb
Hello,

I have an 87 Firebird that is a pretty similar setup to what you are running. 30 over sbc 400 that should be putting out somewhere between the 400-500 hp range. You are correct in saying that it is crazy expensive to get a bulletproof rearend for one of these cars. I am running the stock limited slip rear with a 3.73 gear change and its working pretty well for me so far. I probably have 40-50 passes at the track so far. If I could just get the trans to shift right I would be even happier. I run bfg drag radials at about 15 psi and I rarely have any tire spin. My 60 foot time is usually in the 1.8 range and my best overall so far is a 12.40 @ 112mph. With the overdrive trans I can still drive it to the track at 2850 rpm down the interstate. I think you are on the right track with the 3000 stall too. I opted for the 2400 and I should have gone higher, especially if you say it won't get a whole lot of street time.

Well now you have my two pennies, hope it helps

see this is comfusing, i have a lot of people tell me that the 7.5 can't hold 400hp no matter what you do to it that it's only a matter of time and that the first time you put a set of sticky tires on it at the track it will blow, but at the same time i have seen numerous 98-02 camaro/firbirds at the track running as low as 10.0's still with the 7.625 rear, i the only difference between these 2 rears is .125" and one has 28 spline alxles while the other has 26 spline, some have told me that the carrier in these rears are what will break, and im ready to replace that with a much stronger carrier, i hear form a lot of people these rears wont last then i hear from people still running these rears that they do, i dont plan on running 11.0's with this rear and im not going to be at the track every weekend launching it hard, just 4-6 events a year, the rest will be put-puttin around town, now the day i do plan on taking the motor out and mini-tubbing (or posiblely all out tubbing) it and putting a BBC and glide in it im sure i will go with a 9" or a built 12 bolt, but will i really need one before then
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Old 05-13-2009, 04:35 PM
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I guess if you are worried about breaking it you could go with a Detroit carrier or something like that. There are a few companies out there that also offer better axles too. I just figured with mine I would run it until it broke and see where I wanted to go from there. If you aren't all out race then I wouldn't worry about the 9" or the 12 bolt. You should be able to get by a lot cheaper with a few upgrades to your stock rear.
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Old 05-13-2009, 05:03 PM
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this is what i was thinking, i want the Eaton posi, i have heard great things about them, i do have a spare G-80 posi out of a 87 IROC, that i had planned on putting in the rear till i heard all the horrer stories, so i figure i will sell that one and put it toward the eaton

http://www.jegs.com/i/Eaton/362/19663-010/10002/-1#

or

http://www.jegs.com/i/Detroit+Locker...2C58A/10002/-1

one is a lim-slip and the other is a locker, which should i go after considering they are close to the same price

then with these gears

http://www.jegs.com/i/JEGS/555/60011K/10002/-1

you idea of running the rear till it blows in the same as mine, i will be running P275/60R15 (28X10) rear tires on the street and no i don't really expect to hook up on the street too much, but then on the track i plan on running a 28X10 slick hopfully i will be able to hook there
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Old 05-13-2009, 07:24 PM
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You can add better axles, Posi & Girdle type diff cover for more strength. Here's F-bird88's car. > http://www.youtube.com/watch?v=TDPzrRXkqQM

This is what he said.>>>
The rear is a stock 7.5 with GM 4.10's and a Auburn posi.
Seems to work fine. I keep a extra set of axles in stock, but no problems so far.
A lot of it is in accurate setup. I pulled the cover last year to check the gear back lash. It has not changed. (a good sign)
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Old 05-13-2009, 07:28 PM
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year he sent the same post to me a little while back, i was advised not to go with the auburn though due to the inability to rebuild the cones
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Old 05-13-2009, 07:34 PM
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Yeah, the Eaton or Detroit will be better. Check with these guy's, they match or beat any price + free S/H.
http://completeoffroad.com/c-59839-g-m-7-510-bolt.html
http://completeoffroad.com/
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