Just does not want to burn out!

85chevycamino · Posted: Sat Jun 14, 2008 9:46 am Post subject: Just does not want to burn out!

OK, I have a 1985 camino with a 305, true dual with headers and mufflers, edelbrock intake and 650 cfm carb, k and n airfilter, no computer, no emmisions, no cruise, turbo 350 tranny, and other small bolt ons. This car just does not want to burn out! I punch it and it doesnt break them at all. I should be with this motor/trans and mods, correct? It even struggles with brake stands. Whats that problem? The rear end? It has the stock 2.41 rear. What rear should i get so it can break asphault on a punch throttle? 3.73?
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1985 El Camino Conquista
305/TH350 - true dual, intake ect..
Digital dash
next - nuts sound system!

1979 El Camino SS - Up next for resto
1978 El Camino SS - donor

1BadElky · Posted: Sat Jun 14, 2008 10:35 am Post subject:

You have my EXACT setup (old setup) as far as engine mods. except I had the 2004r.

even with my open 2.41 diff I could barely break loose unless I did a brakestand.

All I have to say is welcome to the world of the LG4 305. If you swap to a 3.42 rear end you should be able to break loose better.

what's sad is my 217k mile 88 B2200 can light em up into 2nd (5spd) with the old 4cyl. Of course I have a 3.90 rear end and will be screaming the engine at just over 80.
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Formerly 86Conquista

Currently undergoing resto.
Planned:
-350/?/3.42
-ZQ8 wheels
-Disc Brakes
-More

darbysan · Posted: Sat Jun 14, 2008 10:53 am Post subject:

I had a smiliar setup and issue, and went to a 3.42 rear end. What a difference! Now, not only will it light em up , but it will also chirp them on the 1-2 shift. With your set-up, and a 2.41 rear, there's not much of a chance. If you were to go to 3.73, I think you would want an OD transmission ( 200-4r or 700r4). Otherwise, your RPM's will be way up there

However, with the way gas prices are going, you might want to consider the impact of the swap on your pocket. At 65, I'm running about 2900 RPM. If you do a lot of highway driving, you will surely notice the difference in your mileage. Also, if you go higher than 3.08, you will need a different carrier in your differential for the gears. You will also need to change out the speedo gears in the transmission.

Good luck with your choice.
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'85 SS, Ash Blue Mica ( 2003 Lexus Color), '87 L69 305, Choo Choo Conversion, Roll Pan, Edelbrock Intake and TES Headers, Acura leather Buckets, 2004 Gp Console and Shifter, 8.5 GN rear with 3.73, GN 200-4r

dougs85 · Posted: Sat Jun 14, 2008 11:50 pm Post subject:

Spray your tire treads with silicone for the burn outs and enjoy the gas milage of your 2.41 rear axle ratio.

Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO

MarkZ28 · Posted: Mon Jun 16, 2008 8:59 am Post subject:

My 83 had a V6 originally but dont know the original gear ratio. I now have a 350 with a Monte SS 3.73 posi and 275/60/15 tires. It will burn off both tires from a take off without much problem. I did have a 327 with 235's on the back and that would also smoke the tires off easy from take off. The bad thing is that you will be turning over 3 grand at 60 mph. Thats why I put the 275/60/15's on for the added height for an effectively higher gear ratio.

85chevycamino · Posted: Tue Jun 17, 2008 2:58 pm Post subject:

Problem is, i do almost no highway driving whatso ever. I also know of a posible 3.73 posi out of a camaro. Is it do able?
_________________
1985 El Camino Conquista
305/TH350 - true dual, intake ect..
Digital dash
next - nuts sound system!

1979 El Camino SS - Up next for resto
1978 El Camino SS - donor

dwagner1974 · Posted: Tue Jun 17, 2008 3:58 pm Post subject: rear end

Hey

A camaro rear end will not work in your Elky . The Camaro is an F-body . You need to look for a good 8.5 10-bolt rear end from a Monte Carlo,Malibu or Grand National .. Its a tough item to find but there out there .. I found one on Ebay reasonable .. Good luck to you !!
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dave1987SS · Posted: Tue Jun 17, 2008 6:21 pm Post subject:

I have a 3.73 posi from a Monte Carlo SS, these are set up for the TH2004r with ovverdrive to allow you to cruise at a lower RPM, and I can light up both tires with my basically stock 305. The Monte SS rear ends are all the 7.5/7.625" gears, not the 8.5". The only cars with the 8.5" rear end that will be a direct bolt in to the 78-87 El Camino is the Buick turbo Regal / Grand National with a 3.42 ratio and the harder to find Olds Cutlass 442/Hurst olds that has the 3.73 gears. Not sure what years had the 8.5 but somewhere between 84-88 so you will have to do your research and expect to pay a lot more for the 8.5. But with your 350 engine the 7.5 should hold up unless you beat the hell out of it! I would throw in the 3.73 & a posi carrier into your stock rear or swap out the entire rear with a Monte SS one. Run it till it breaks, you will definately be able to spin those tires. With the TH350 you may be better off with the 3.42.
Dave
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1987 El Camino SS Choo Choo customs package w/ Monte Carlo SS tranny, 3.73 rear end, sway bars, alloy wheels & exhaust system, SS dash & S-10 dual piston brakes - Soon to come - 350 roller cam... all emissions legal!

85chevycamino · Posted: Wed Jun 18, 2008 1:00 pm Post subject:

I figured out what the probelm was! FOr the most part. The kickdown cable's adjustable piece that goes on the cable was to far up, cuse it to not kickdown when i stomp on it. But i still want a better rear end, esp. for the posi.

You say the camaro will not work, but with modification it should, correct? What would be involoved to get the camaro rear end in?
_________________
1985 El Camino Conquista
305/TH350 - true dual, intake ect..
Digital dash
next - nuts sound system!

1979 El Camino SS - Up next for resto
1978 El Camino SS - donor

darbysan · Posted: Thu Jun 19, 2008 5:32 pm Post subject:

The Camaro rear end is not a direct fit. Width is not the same, and spring / shock mounts are different, as well as upper control arms. Only the lower control arms are the same ( IIRC).

However, if the camaro rear is a 7.5" 10 bolt, you might be able to use the Posi carrier and gears. I do not know if the axle spline count is the same. Somebody smarter should chime in on that.

All said and done, the easiest swap is as mentioned- I swapped in a MCSS 3.42, and it was just a bolt in. Much easier to swap in a running setup than trying to set backlash and pinion crush depth if you are not familiar with those processes ( and have the tools). With my TH350C, it does a good job ( smokes em in 1st and 2nd), and only runs about 2800 RPM at 60 MPH. 3.73 would be running 3200 + RPM at 60- gets pretty noisy after a while!
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'85 SS, Ash Blue Mica ( 2003 Lexus Color), '87 L69 305, Choo Choo Conversion, Roll Pan, Edelbrock Intake and TES Headers, Acura leather Buckets, 2004 Gp Console and Shifter, 8.5 GN rear with 3.73, GN 200-4r

elcamino74guy · Posted: Thu Jun 19, 2008 10:17 pm Post subject:

82 and up 7.5 should be a 26 spline setup.
Also note that the 7.5 rear end is considered at the
bottom of the performance ladder when it comes
to performance. I know they ended up in 4th gen Trans-AM's and
Camaro SS's but frequently failed when put under sustained stress.

One of the reasons for the choice of axle had to do with the design of
the Camaro/Firebird platform. An old GM engineer friend of mine who worked on F-body development back in the 90's told
me that they had originally intended to keep the 8.25 inch rear but the chassis designers didn't talk to the body designers and ended up having
to go with the 7.5 rear end due to clearance issues and suspension mount points.

Happy

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74 El Camino Classic - project car #1
96 Camaro - RIP, Traded 10-16-2007

2008 Mustang GT, It ain't a Chevy but at least it's American!

MarkZ28 · Posted: Sat Jun 21, 2008 6:51 pm Post subject:

Actually, the 4th gen F bodies has the 7 5/8 rear end, not much difference and just as weak but its not the same 7.5 thats in the S10 trucks. Axles may be the same though. They should have kept the 8.5" at a minimum. People stuff 9" and 12 bolts under stock F bodies with no troubles, even Dana 60's, so dont why they couldnt have put a bigger rear in the F bodies or the G bodies for that matter.

turboapache · Posted: Tue Jul 01, 2008 11:00 pm Post subject:

I put a Monte ss 3.73 posi in my El Co 4 years ago. The eng is a full roller 406 making just over 500 ft lb of torque and goes thru a fully built 700 r4 and it gets some serious abuse. I went thru the rear end when I put it in with all new seals and I have never had a moments problem with it. Your best bet would be a Monte rear end because it is a direct bolt in.
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Bigger is always better-406 full roller motor, purpose built 700r4, 373 posi

turboapache · Posted: Tue Jul 01, 2008 11:06 pm Post subject:

With the setup that I have with 275/60/15s in back my cruise at 70 mph is around 2300 rpm. My speedometer cable gave up on the way home from the tranny install so I checked my speed with a hand held GPS. That overdrive sure makes a difference and you get the low 1st gear as a bonus.
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Bigger is always better-406 full roller motor, purpose built 700r4, 373 posi

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