1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Proper way to "lock" a diff. (pics)

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Old Feb 15, 2006 | 03:43 AM
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REVHED's Avatar
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Proper way to "lock" a diff. (pics)

I cut and welded a metal plate into both sides of the gear arrangement so all four gears are solidly tied together. I dare this sonofabitch to break.



Also, a teaser pic of my 13BT swap. Just need to put a FPR and exhaust in and she'll be ready to fire up.



Microtech installed in the glovebox...



which will be hidden by this panel.

Attached Thumbnails Proper way to "lock" a diff. (pics)-diff.jpg   Proper way to "lock" a diff. (pics)-engine.jpg   Proper way to "lock" a diff. (pics)-mt.jpg   Proper way to "lock" a diff. (pics)-mt2.jpg  
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Old Feb 15, 2006 | 04:47 AM
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Sweet!!! Is that a fire exstinguisher under the glovebox?
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Old Feb 15, 2006 | 05:23 AM
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Very very nice setup, I hope some day to also be throwing down some big horsepower with my car with a nice swap like this! If you don't mind me asking what are you doing for the oil cooler? Are you just running the stock frontmount? And do you happen to have another thread detailing your motor swap in more detail?

Thanks!
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Old Feb 15, 2006 | 05:41 AM
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Originally Posted by Rotor13B
Sweet!!! Is that a fire exstinguisher under the glovebox?
Yep. Hopefully I won't need it.
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Old Feb 15, 2006 | 05:42 AM
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Originally Posted by Dan_s_young
Very very nice setup, I hope some day to also be throwing down some big horsepower with my car with a nice swap like this! If you don't mind me asking what are you doing for the oil cooler? Are you just running the stock frontmount? And do you happen to have another thread detailing your motor swap in more detail?

Thanks!
I'm running a stock oil cooler. If you search under my username you should find some threads about the swap.
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Old Feb 15, 2006 | 07:20 AM
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Originally Posted by REVHED
I cut and welded a metal plate into both sides of the gear arrangement so all four gears are solidly tied together. I dare this sonofabitch to break.


Much better weld than the one in my RX-3's poor man's posi.
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Old Feb 15, 2006 | 07:31 AM
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Beautiful... Just beautiful...
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Old Feb 15, 2006 | 08:06 AM
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It just may break. The way you did it looks good, but my uncle knew a guy who was a car junkie and a Ferrari machanic and he had his own machine shop in is garage. One of the tools he used when welding a diff is a oven to heat up the diff to an un-godly temperature to make a better bond between the diff and whatever he was welding to it. He welded one for my uncle's race car and it lasted 3 seasons road racing, while everyone else went through about 2-3 diff's per year. BTW The way everyone else did it was to put nuts and bolts inside the spider gears and weld it all together. The way you did it looks much better.
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Old Feb 15, 2006 | 11:41 AM
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How much did the engine cost?
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Old Feb 15, 2006 | 01:08 PM
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Nice work. Thick penetrating welds.
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Old Feb 15, 2006 | 01:26 PM
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Is there any write ups on how to lock a diff (for a n00b) compared to switching out the whole suspension
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Old Feb 15, 2006 | 05:35 PM
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I problem with the "poor man's posi" is the fact the gears are cast and cast doesn't like to be welded unless it's preheated to about 1,500 degrees F, and requires a stick or wire meant to weld cast iron which is an alloy or combination of two or more metals, but it'll hold for a while, how long is unknown though.....
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Old Feb 15, 2006 | 07:16 PM
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Very nice...why are you holding out pictures of the turbos side...I want to see
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Old Feb 15, 2006 | 08:03 PM
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Originally Posted by Tatterjuice_771
I problem with the "poor man's posi" is the fact the gears are cast and cast doesn't like to be welded unless it's preheated to about 1,500 degrees F, and requires a stick or wire meant to weld cast iron which is an alloy or combination of two or more metals, but it'll hold for a while, how long is unknown though.....
I think the axles will break before the diff does. I know several people who have done it exactly this way and they haven't had a problem. Only time will tell though.

It's only a temporary measure until I can get my Guru Torsen anyway.
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Old Feb 15, 2006 | 08:05 PM
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don't know why you'd want to make a nocker...
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Old Feb 15, 2006 | 08:13 PM
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Originally Posted by z-beater
Very nice...why are you holding out pictures of the turbos side...I want to see
Nothing special. Just a high-flowed Series 5.

Attached Thumbnails Proper way to "lock" a diff. (pics)-turbo.jpg  
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Old Feb 15, 2006 | 08:14 PM
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Originally Posted by Lee Lyons
don't know why you'd want to make a nocker...
A number of reasons... can't afford an LSD at the moment and they're hard to come by here short of a Guru Torsen or full Hilux conversion, open-wheelers suck, this isn't a daily driver and I'll need all the traction I can get. Don't knock it until you've driven one.

Last edited by REVHED; Feb 15, 2006 at 08:19 PM.
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Old Feb 15, 2006 | 08:19 PM
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Looks good, now that sucker is locked!
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Old Mar 1, 2006 | 01:40 AM
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My LSD is shot I wanna do that now... Dori Dori
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