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Stuffing a FC rear end in a FB

Old 05-20-12, 07:03 PM
  #26  
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Wow, that is awesome. I can't wait to see what you think of the handling now.
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Old 05-20-12, 11:05 PM
  #27  
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All you need is a driveshaft yolk from a second gen automatic. Same yolk as the TII, but uses the same u-joint as the 83.5 to 85 first gens. No need for an expensive custome driveshaft.
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Old 05-21-12, 12:30 AM
  #28  
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Im pretty sure the stock turbo II driveshaft will bolt right up.. There is no part left on the cars drivetrain that is first gen.
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Old 05-21-12, 07:46 AM
  #29  
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Isn't the diff you're using an NA? If so you'll need the NA yoke.

In either case that is looking great, really nice work! Looks like it belongs there
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Old 05-21-12, 12:51 PM
  #30  
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If the rear center is NA, just use the entire automatic driveshaft. That will work!
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Old 05-21-12, 08:39 PM
  #31  
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Originally Posted by bad 83 View Post
If the rear center is NA, just use the entire automatic driveshaft. That will work!
That is sweet!!! I had no clue that the automatic driveshaft had 23 splines.. That and I wasnt sure if the rear diff used a different flange between N/A and turbo..

So if a FC guy swaps a turbo II tranny in his N/A car he just has to get a automatic drive shaft and he is basically good to go? Thanks for the info guys!
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Old 05-21-12, 09:00 PM
  #32  
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I Did a bit of research and found out the automatic driveshaft is close to two inches shorter. Has anybody had trouble using this setup before? Like bad vibrations or anything?
Attached Thumbnails Stuffing a FC rear end in a FB-drive_shaft_specs.jpg  
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Old 05-21-12, 10:29 PM
  #33  
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well it depends, whats the length between your tranny and diff? are you positive its the same as a 2nd gen?
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Old 05-22-12, 12:40 AM
  #34  
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Originally Posted by Keeble View Post
well it depends, whats the length between your tranny and diff? are you positive its the same as a 2nd gen?
You have a very good point.
So, As soon as it stops raining Im going to crawl under there and take some measurements.
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Old 05-22-12, 09:15 PM
  #35  
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So I did some measuring today it is about 35.5 inches from the diff flange to the end of the transmission tail housing. So Im guessing the automatic driveshaft is out of the question It being 35.94 inches long. The turbo/N/A length driveshaft(38 inches) looks like it will be a great fit.

OK so here are my options.
1.Get custom driveshaft made.
2.Install turbo diff, halfshafts and turbo driveshaft.
3.Get N/A flywheel and clutch. Then use the N/A transmission and drive shaft I already have.

I think its time to start looking for a clutch and flywheel.
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Old 05-23-12, 01:59 PM
  #36  
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well this swap looked rather straight forward. I considered it for my rally car. perhaps ill go through it it. I just really do not like the pin mount for the struts. I have thought about using a toyota mk3 supra assembly instead.

or go four link...
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Old 05-23-12, 04:55 PM
  #37  
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Just get tII trans, diff and shafts. The NA stuff is fairly weak. The transmissions are only designed for NA, they cant handle much hp. You'll shear the teeth right off the gears. The diff's are okay, I havent heard too much of them grenading. Your going to end up swapping to TII stuff anyway, might as well do it now.
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Old 05-23-12, 06:11 PM
  #38  
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Originally Posted by Gravity Fed View Post
well this swap looked rather straight forward. I considered it for my rally car. perhaps ill go through it it. I just really do not like the pin mount for the struts. I have thought about using a toyota mk3 supra assembly instead.

or go four link...
The swap was pretty much straight forward. Everything kinda fit right in, Besides the subframe mounts.

I havent driven the car yet, But I would recommend this swap to anybody that can Cut, measure and weld. The most metalworking I had under my belt before this was a welding class and I made a couple exhaust systems.

It did cost close to $200 Dollars(Sheetmetal, cutoff discs, welding wire, Seam sealer Etc.) and quite a few man hours.

I would do this swap again.
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Old 05-23-12, 06:39 PM
  #39  
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good trade?

Originally Posted by RE-TurboFB View Post
The swap was pretty much straight forward. Everything kinda fit right in, Besides the subframe mounts.

I havent driven the car yet, But I would recommend this swap to anybody that can Cut, measure and weld. The most metalworking I had under my belt before this was a welding class and I made a couple exhaust systems.

It did cost close to $200 Dollars(Sheetmetal, cutoff discs, welding wire, Seam sealer Etc.) and quite a few man hours.

I would do this swap again.
Tell you what. You swap my rear and I'll swap your front!

I will be doing this swap in the future. You made it look easy. Good job!
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Old 05-23-12, 08:24 PM
  #40  
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Ooops! I lied in that last post. I forgot to mention that I did a FC front subframe swap as well. But The front end has a bad ride hight issue.

Frankenmazda your car is AWESOME!!! (IMO)A IRS setup would really set it off!
Attached Thumbnails Stuffing a FC rear end in a FB-front-subframe.jpg   Stuffing a FC rear end in a FB-side2.jpg  
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Old 05-26-12, 12:42 AM
  #41  
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well you convinced me to try it i think.
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Old 05-26-12, 02:15 AM
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how much suspension travel are you getting in the rear. especially with out the sway bar.
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Old 05-26-12, 12:15 PM
  #43  
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Originally Posted by Gravity Fed View Post
how much suspension travel are you getting in the rear. especially with out the sway bar.
The sway bar is installed.
This is the only part on the FB that will limit suspension travel, and the only part of the FC rear end that would make contact here is the "lateral link".

The way mine is setup right now the tire will bury itself into the fender well before it will run out of suspension travel.
Im sure if I went with a smaller diameter wheel/tire It would still bury it in the wheel well before any suspention components would make contact.
Attached Thumbnails Stuffing a FC rear end in a FB-sus-travel.jpg  
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Old 05-26-12, 12:36 PM
  #44  
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ride height

Originally Posted by RE-TurboFB View Post
Ooops! I lied in that last post. I forgot to mention that I did a FC front subframe swap as well. But The front end has a bad ride hight issue.

Frankenmazda your car is AWESOME!!! (IMO)A IRS setup would really set it off!

Looks like you are going to have to ditch the springs and go to a coilover setup. You can also raise the strut towers. I raised mine 2 inches but the hood hits it so you have to deal with that as well. An inch or so will clear the hood.

I would love to add a FC IRS but for now I just want to drive it! Maybe a future winter project.

Can't wait to see yours finished.
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Old 05-26-12, 08:39 PM
  #45  
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Originally Posted by Frankenmazda View Post
Looks like you are going to have to ditch the springs and go to a coilover setup. You can also raise the strut towers. I raised mine 2 inches but the hood hits it so you have to deal with that as well. An inch or so will clear the hood.

I would love to add a FC IRS but for now I just want to drive it! Maybe a future winter project.

Can't wait to see yours finished.
I'm a huge fan of your car!!!
I LOVE what you did with your front strut towers!!! I am going to do that myself(but only one inch).

I am going to get a set of coilovers, But its going to be awhile. Im a single dad with a four year old and I work at home depot.. So its a major "budget" build..
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Old 05-28-12, 10:02 PM
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Would you happen to know how wide the fc assy is wheels mounting space to wheel mounting space?
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Old 11-09-12, 01:47 PM
  #47  
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RE-Turbo FB - Just wondering how this setup holding up?.
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Old 11-09-12, 02:43 PM
  #48  
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This is awesome .. keep us posted on how thing are going with the FB
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Old 11-09-12, 03:25 PM
  #49  
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Im curious to see how much it weighs!
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Old 11-11-12, 04:57 PM
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great job!! i've been seriously wondering about this idea. you may have just helped me with the last idea for my se. props to you.
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