What is it worth? I have a complete rear and just a pumpkin.. just wondering?

Thanks

 

$1.00!

 

lol.. I knew this was coming.. ok 1.00 and 400.00 shipping.. lol

 

Complete rear-end with drums or discs? Posi or open? Regular case or "N" case? All of these are important to determine pricing...and please tell me this ain't for a 1stgen unless you got 500+ ft lbs of torque at 2500 rpm with 11" wide racing slicks....the added weight factor is huge even compared to anything else domestic out there short of a mopar Dana rear-end.

 

I just got it in a huge lot i purchased of rx-7 parts.. I will check it out tomorow.. where are these markings at? Never messed with Ford stuff..

 

is it modded to fit a fb? if so i might be interested, depending on the info needed above

 

On the pumpkin case with the ribs, you're looking for a capital "N" cast between ribs on the front side. These are more desirable. The more ribs, the better. Has this already been cut to fit under a 1stgen if it was in a pile of RX-7 stuff?

 

Has not been cut.. will go today and look at it

 

mar 3, drag racing with any real power and sticky tyres will kill the factory tooth pic rearend.
we have just had a 9" built for ours, 31 spline strange axels, posi track lsd, running a superchaged 20b should break this in a hurry

 

With that kind of power, it is justifiable...but anything like 350 HP or less simply doesn't justify the added weight of the Ford 9-inch...there are plenty of other alternatives that won't break weighing half as much...super-charged 20B...man, that is going to be one sick rocket ride...

 

Yeah, I plan on having more than 400 when I finish up and get all the kinks worked out and get accustomed to driving the car. I am really positive that the stocker will not do. However I am really hesitant on placing and 8.8 in there due to the fact that it robs so much hp.

What other option do you have though? There is a upgraded diff for over 1k IIRC.

 

toyota hilux will be fine with 400-500hp, if you dont go drag racing. My brother has driven a 1st gen with 420hp at the wheels and it just tears the ring and pinion to bits

 

Pics

 

pics of our car?

go to this thread (its in the 1st gen room)

https://www.rx7club.com/1st-generation-specific-1979-1985-18/supercharged-20b-s1-507599/

 

i dont think you will break a ford 9 inch with that setup, there are LOTS of high tq/hp big block motors pushing some power and they are still fine (by some i mean 800+). BUT if you do break it look into a dana 60 from strange engineering.

 

You won't break a 9" rear. I mean hell thats even what Nascar uses in there Fords. It's also a very popular drag rear mainly because of it's strength and wide selection of gear ratios. Even Chevy guys use it in high perfromance applications because of the two carriers on the inside. My friend has a stocker with different gears running 650 whp and it has never skipped a beat. The transmission on the other hand has because it can not handle the torque. Also, the horsepower has nothing to do with the abuse on the driveline. it's the torque you have to look at.

 

the toyota hilux where do you get that from , also what gears are in there , also is that a direct fit or do you need custom fit it? also what bolt pattern ?

 

razorback, I certainly donty think I will break the 9", thats why we went with it.

Also just because those boring roundy roundy nascars use them, that doesnt mean stuff ll. those cars bearly put any load on their diffs in comaprison with any half decent car with sticky tyres launching on a strip. Also a standard 9" isnt all that great, we have just had two rotaries here in NZ leave their diff heads on the track because the factory carriers etc are **** weak when running sticky tyres and big axels.

The hliux diffs come out of just that, Toyota hilux's.
rations vary but there are good ratios available.

 

I'll still have to disagree but thats my opinon how much drag do thing there isn't at 200 mph. There tires are plenty sticky to at 11" wide per tire. Most drag race sanctions use 9" rears also. Also, if they were spending the money to drag and beefed up the axles then they should have had enough sence to work on the carrier it self. A lot of budget drag racer will start welding the inside of the diff. to make it locked up all the time and that can cause some serious damage.

 

On a street car:

Don't replace your rear end with anything other than stock - until you break it.
Swapping the rear with anything else should be a last resort.

With street tires, you won't be breaking the stock rear. The tires will give out wayyyy
before the rear does. It's only when running some really sticky tires that you you need
to look into a swap.

 

direct, what is the hp limits on the stock 84 gsl lsd rear? and what are you running again? 8.8?

 

if you do break one, then i will be impressed.

and yeah, nascar doesnt do hard launches. what kills rear ends are weight of car, torque and sticky tires (also a manual trans is harder on the rear than an auto)

 

Hard launches off of pit road. 600-700lbs of torque there with super sticky flat 11 wide tires.

 

I agree with Directfreak. What is the point of replacing something until it is broken. The only reason to do this is for preventitive maintenence when it could damage something else down the line. However since the rear end is one of the last components what is the point.

 

I don't know what the limit is, but many guys running V8's in them are still running fine.
It's the shock of drag racing that usually breaks them.

My *guess* would be 350-400 on street tires with a stock rear in good condition,
as long as you don't abuse it.