Hey guys,
So ive been trying to figure this out...definitively figuring this out. I keep finding a bunch of miscellaneous answers. I have a full GTS LSD rear end disc to disc with e-brake cables, brake proportioning valve and a GTS driveshaft. Im planning on ditching my drum brake rear and replacing it with this.
I will still have the 4ac, and my T50 trans has the SR5 bellhousing and SR5 speedogears in there.
Since I will be keeping the 4ac do I still need to replace the speedo gear to the 19 tooth GTS one to correct any speed readings since the final drive is different then the SR5s?
The driveshaft, I only need the rear end half correct?
Anything else I am missing for the swap or should take note of?
Need the Corolla messiahs to chime in here.
AE86 GTS rear end on an SR5 with 4ac
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Caccomando
- Club4AG Enthusiast
- Posts: 96
- Joined: Sat Aug 15, 2015 6:57 pm
Re: AE86 GTS rear end on an SR5 with 4ac
Not my speciality, but I'll take a run at it 
1. SR5 manual trans come with a 3.909 diff ratio, and the GTS comes with a 4.3 ratio.
So if you want the speedo to read correctly, you will need to change speedo gear.
2. I believe that the GTS diff head is longer that the SR5 diff head by around 3/4".
If that is about the difference between the back halves of the driveshaft you're good
3. The rear e-brake cable are different, so use the GTS single rear cables.
4. Use the GTS proportioning valve if the SR% does not have one already fitted.
5. Make sure the rubber trailing arm bushes are in good condition.
6. When swapping the rear drive shaft, make sure the universals line up the same
way they line up on the SR5 driveshaft.
7. Use jackstands and chock the front wheels when working under the car.
8. Don't torque up the trailing link fixing bolts until the weight of the car is on the
rear axle. Jack under the diff and drop the rear end onto axle stands to tighten.
9. Adjust the e-brake and check the brake pads have life left in them.
10. Bleed the brakes and test drive carefully to make sure you pull up straight.
Cheers... jondee86
1. SR5 manual trans come with a 3.909 diff ratio, and the GTS comes with a 4.3 ratio.
So if you want the speedo to read correctly, you will need to change speedo gear.
2. I believe that the GTS diff head is longer that the SR5 diff head by around 3/4".
If that is about the difference between the back halves of the driveshaft you're good
3. The rear e-brake cable are different, so use the GTS single rear cables.
4. Use the GTS proportioning valve if the SR% does not have one already fitted.
5. Make sure the rubber trailing arm bushes are in good condition.
6. When swapping the rear drive shaft, make sure the universals line up the same
way they line up on the SR5 driveshaft.
7. Use jackstands and chock the front wheels when working under the car.
8. Don't torque up the trailing link fixing bolts until the weight of the car is on the
rear axle. Jack under the diff and drop the rear end onto axle stands to tighten.
9. Adjust the e-brake and check the brake pads have life left in them.
10. Bleed the brakes and test drive carefully to make sure you pull up straight.
Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.
-
Caccomando
- Club4AG Enthusiast
- Posts: 96
- Joined: Sat Aug 15, 2015 6:57 pm
Re: AE86 GTS rear end on an SR5 with 4ac
jondee86 your the man! Cannot thank you enough. That was pretty much everything I was wondering/needed summed up.
I appreciate the reply!
I appreciate the reply!