Rear End Trouble
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Rear End Trouble
I own a '82 and I am putting in a 388 ci engine it with put out about 600 hp, and 300 shot of NOS. Only problem is I know the rear end won't hold up, I have found a driveshaft, all the joints, halfshats that will with stand it, and am haveing the factory diff. rebuild, should I replace anything else? Also will the stock 700 R4 hold up?
Thank you for comments :confused: :confused: :confused:
Thank you for comments :confused: :confused: :confused:
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Re: Rear End Trouble (gerry72)
Is there something that I am missing. Can some one give me a real answer please and tell me if it will all hold up? Is there anything I should be conserned about? Anyone? :confused:
Premium Supporting Vendor
Joined: May 2000
Posts: 4,312
Likes: 70
From: Clearwater FL
Re: Rear End Trouble (wgc_3)
As far as the rear end goes, you might get away w/the aluminum diff for awhile w/out using the nitrous. Once you use the nitrous, I'm afraid you will probably need a basket to pick up your parts. Your answer lies within this link. http://vansteel.com/photos/index.cfm...Thumbs&e=4&s=1
Pro
Joined: Sep 2002
Posts: 690
Likes: 1
From: near Memphis TN
Re: Rear End Trouble (wgc_3)
A standard (not built up) 700R4 will only take about 450 hp, the aluminum differential will handle about the same. If you plan on sticky tires and expect to launch you have more to worry about than just the transmission and differential. - start thinking new halfsharts, strut rods, U-joints, trailing arms...
Van Steel will set you up.
300hp nitrous shot????? Yikes!
Van Steel will set you up.
300hp nitrous shot????? Yikes!
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Re: Rear End Trouble (SpyderD)
Thank you all for the help. Now about the tranny would a 350 hold? Or what should I do about the tranny. I have the halfshats, sturt rods, trailing arms, joints, and the driveshaft taken care of. But about the tranny? :hurray:
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Melting Slicks
Joined: Mar 1999
Posts: 2,845
Likes: 2
From: Apex NC
Re: Rear End Trouble (wgc_3)
Please post specifics about the 388 motor, what components you are using to generate the 600hp. Pictures would be nice too, preferably ones with you standing in the photo holding todays newspaper. I'd like to see how a 17 year old (according to your profile) builds a 600hp smallblock.
:troll
:troll
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Re: Rear End Trouble (sb69coupe)
It was a mistake its a 383 Competition Machine of Plano (look them up) is building it for me, all forged parts of course for the NOS, Edelbrock Vortec 200 Heads (CMP is doing the valves, rocker arms, etc.) with the Edle. Vortec Intake manifold, Demon 750 cfm carb, with a Paxton Supercharger. I am making sure everything is correct before I put it in there because I don't care to waist the money I have saved in order to make sure this engine will put out what it is hoped to, also this is an estimate it will be out of the flywheel not the wheels. Also my question is to you why doubt some one when they are asking for help? Why not try to give your opinion on the matter?
Also the intake manifold will be ported for the NOS, if you are interested in that as well.
Is there any other questions I might be able to answer for you?
Also the intake manifold will be ported for the NOS, if you are interested in that as well.
Is there any other questions I might be able to answer for you?
Melting Slicks
Joined: Mar 1999
Posts: 2,845
Likes: 2
From: Apex NC
Re: Rear End Trouble (wgc_3)
Alright, right back at you. http://www.tomsdifferentials.com/ is the place to go if you need a beefed up rear end. It does not appear that any of their beefier setups are offered for the '80 to '82 style rear suspension. That would lead me to believe that the aluminum third member is not suited to high horsepower.
Now, to answer your question, yes, there are other questions you can answer. What compression ratio are you setting up for in the 383? What model of Paxton supercharger are you going to use?
Now, to answer your question, yes, there are other questions you can answer. What compression ratio are you setting up for in the 383? What model of Paxton supercharger are you going to use?
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Re: Rear End Trouble (sb69coupe)
When I asked CMP what compression I would be using because I wanted to know for the octane they said it would have to be 9.5:1 because of the supercharger, they make a universal supercharger for carbureted engine that is the one I am planning on going with. I asked them what was the base hp out of the engine and they said it’s about 450, and with the supercharger would be about 600. They will be using a Merlin block?! (sounds right unsure of that part)
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Re: Rear End Trouble (wgc_3)
If you are using a Merlin block why only 383. Why not really use the block and go 434 or 454. Now you would make some power. A stock 350 block properly machines and setup would handle a 383 to your specs.
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Re: Rear End Trouble (wgc_3)
The general opinion among those who know is that most of us would never
require 4 bolt mains. Very extreme conditions (say 8000 RPM) would start
to require 4 bolt mains, but most of the HP builds you see only NEED 2.
Of course, no one can argue against "better safe than sorry".
With NOS and a charger, I guess I would err on the side of caution.
You could always weld in the farme brackets to use an early style rear end.
They sell all the parts, but it all adds up.
Good luck choosing which direction to go. :seeya
require 4 bolt mains. Very extreme conditions (say 8000 RPM) would start
to require 4 bolt mains, but most of the HP builds you see only NEED 2.
Of course, no one can argue against "better safe than sorry".
With NOS and a charger, I guess I would err on the side of caution.
You could always weld in the farme brackets to use an early style rear end.
They sell all the parts, but it all adds up.
Good luck choosing which direction to go. :seeya
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
Likes: 0
From: Dallas Texas
Re: Rear End Trouble (Van Steel)
I am going with a compant out of IL, I called them up and asked them if their product could with stand the amount of HP, and torque. Their reply was it'll take more if you wanted to add it, also that if they break for what ever reason they would replace it free of charge, here is their website.
http://www.dennysdriveshaft.com/html...dent_rear.html
http://www.dennysdriveshaft.com/html...dent_rear.html
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Re: Rear End Trouble (Van Steel)
If they have problems with a Merlin block going bigger than 383 and high doses of nitrous I say get a better engine builder. I have seen plenty of 427 SB going 800+ HP with no problems.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Re: Rear End Trouble (Van Steel)
The 2 bolt block could be from an 82. Not all Corvette blocks are 4 bolt blocks. Probably the majority of them are 2 bolt. I agree a stock block won't handle much more than 388 and 600 HP but a Merlin block should be able to go larger and more HP. The 2 bolt block is still OK just have them machine it for splayed 4 bolt caps and you should be OK. The heads crank and other parts are not worth that much. Someone might want them but not for much.
Thread Starter
Instructor
Joined: Apr 2004
Posts: 239
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From: Dallas Texas
Re: Rear End Trouble (Gordonm)
I just called the shop and asked them the question you just asked me, and they said since the NOS is so high and with the added compretion of the supercharger that if I was to use a stock block then the walls wouldnt hold and if we were to go bigger then a 383, they would also have problems.
But I thank you for asking so that way I may know.
Thanks :confused:
Also, I tore apart the old block I had, I have two questions
One: What can I do with all the old parts, crank, heads, pistons, etc. is there anything I can get for them.
Secondly: The block was a two bolt main, which leaves me to believe it isnt the stock block, anyone have any opinions on the matter?
Thanks for all the help.
But I thank you for asking so that way I may know.
Thanks :confused:
Also, I tore apart the old block I had, I have two questions
One: What can I do with all the old parts, crank, heads, pistons, etc. is there anything I can get for them.
Secondly: The block was a two bolt main, which leaves me to believe it isnt the stock block, anyone have any opinions on the matter?
Thanks for all the help.
Premium Supporting Vendor
Joined: May 2000
Posts: 4,312
Likes: 70
From: Clearwater FL
Re: Rear End Trouble (Gordonm)
I have the halfshats, sturt rods, trailing arms, joints, and the driveshaft taken care of.
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What have you done? What type of driveshaft and u-joints? Half Shafts?
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What have you done? What type of driveshaft and u-joints? Half Shafts?