Turbo-Coupe rearend swap

Topic: Turbo-Coupe rearend swap (Read 10872 times) previous topic - next topic

Turbo-Coupe rearend swap

July 13, 2010, 08:03:22 PM

Hey All, We've been doing some more work to the '87 XR-7. Finally have the 3:73 rear end from an auto '88 TC installed in the car. Along with the rear end, we've replaced the calipers, pads, turned the rotors, all new brake lines, CHE upper and lower tubular control arms, new Moog springs and axle dampener shocks and replaced the fluid with Royal Purple. The car would have been up and rolling again yesterday, but we are trying the proportioning valve from the TC to see how that works and have had to chase down all of the fittings, lines, unions etc to get the brake lines all hooked up. Should be rolling tonight. :burnout:

If any one needs a 2:73 Trak-lok 7.5 let me know. :hick:

Turbo-Coupe rearend swap

Reply #1 – July 13, 2010, 08:05:27 PM

pics

Turbo-Coupe rearend swap

Reply #2 – July 13, 2010, 08:50:30 PM

Looking good. I hated that job as my rearend began to make some pretty nasty noises soon after the swap. A rebuild later and higher gears, it appears to function well. Disc brakes made my parking brake MUCH stronger.

Turbo-Coupe rearend swap

Reply #3 – July 13, 2010, 09:20:33 PM

That's what I want out of the brakes. Just swapping in the front Mustang GT brakes made a world of difference! I hope now it'll be like throwing out a boat anchor.:D

Turbo-Coupe rearend swap

Reply #4 – July 13, 2010, 09:32:16 PM

Awesome job Mechanized. I have to do the same swap. Did you have to use the adapter for the hard line in the rear of the car to the soft hose on the TC diff? I have to do this swap and I wanna make sure I have all the parts to do it including the adapters for the front TC brakes and the porportioning valve.

Keep us posted. I am watching this.

Turbo-Coupe rearend swap

Reply #5 – July 13, 2010, 10:30:10 PM

Quote from: 86caprirs;328222

Awesome job Mechanized. I have to do the same swap. Did you have to use the adapter for the hard line in the rear of the car to the soft hose on the TC diff? I have to do this swap and I wanna make sure I have all the parts to do it including the adapters for the front TC brakes and the proportioning valve.

Keep us posted. I am watching this.

Hey Thanks man,

Yes, I had a hard line made at a place here called the brake shop. It has the 3/16 fitting to the car side and then the 5/16 fitting to the rubber line on the diff. side. The new adapter line is only 14 inches long. I'll post more pics.

Turbo-Coupe rearend swap

Reply #6 – July 14, 2010, 12:12:52 PM

I did about this same swap ( I used the 88 TC rear disc brakes on a 7.5 rear ) and found that if you use the 84 Mustang SVO Master cylinder tthe rears will fell way more firm and aggressive.

the 85 TC Master cylinde is 7/8 plunger and the 84 Mustang SVO MC is 1 1/8 so it moves more fluid quicker.

Turbo-Coupe rearend swap

Reply #7 – July 14, 2010, 01:52:02 PM

Ok, good to know, I'll keep those in mind if this isn't as responsive as I would like.

Turbo-Coupe rearend swap

Reply #8 – July 14, 2010, 09:04:58 PM

I have the complete diff sitting at home. I cut the hard line at the flex so i could save the flex hose. I was hoping it was a direct bolt on to the line. I have the adaperts for the front. may be the same for the rear?

Turbo-Coupe rearend swap

Reply #9 – July 14, 2010, 09:05:30 PM

yes. I would love to see pics. I do beter seeing then reading.

Turbo-Coupe rearend swap

Reply #10 – July 15, 2010, 11:49:57 AM

you will need the bracket from the TC doner car, the hard line from the body is on the pass side with the drum brake rear

the disc rear ( If your still using the 88TC axl hard lines) the flex is on the driver side of the rear.

the body hard line will need to be extended about 12-16 inces over to the driver side.

Also, (if I remember correctly) the body hard line on the 88 TC is 1/4 inch for the rear disc, and the drum brakes use a 3/16

so to get the rear calipers to work properly, you should upgrade the rear feed hard body line it 1/4 to get proper fluid flow

calipiers by design need more fluid flow

Turbo-Coupe rearend swap

Reply #11 – July 16, 2010, 06:32:05 PM

Any pics yet???????

Turbo-Coupe rearend swap

Reply #12 – July 16, 2010, 09:10:57 PM

LoL, not yet. Working massive overtime.

Turbo-Coupe rearend swap

Reply #13 – July 16, 2010, 10:12:11 PM

Thats sucks....but it does bring in extra doe!!!!

Turbo-Coupe rearend swap

Reply #14 – July 17, 2010, 12:29:12 AM

I'm so confused...I probably forgot by now but I don't remember any issues with my car's hard lines? The fronts I had to modify the brackets to get the houses clipped into place but I don't recall any issues with the rear. My intermediate hose was looking a little aged so I replaced it but from there it all bolted in fine? I had 10" rear drums previously.

I also came to some conclusion that the stock proportioning valve would never protect you if you lost fluid pressure, but I don't remember the reasoning. I was so worried about keeping it in place for its protective benefits until I found how it worked and that it wouldn't stop any accidents if one hose were to blow somewhere on the car. It's amazing how much I knew, yet now I can't remember. Either way, the adjustable made quite a big difference in front to rear with 73mm calipers up front and the (38mm? 43mm?) TC ones out back.