Fox T-Bird/Cougar Forums

Technical => Drivetrain Tech => Topic started by: a77cj7 on July 13, 2010, 12:51:14 PM

Title: 3.8 and 5.0 aod interchangable?
Post by: a77cj7 on July 13, 2010, 12:51:14 PM
Just lost the trans in my 87 5.0. Didn't last long behind the new 300hp motor.

All my local jy has are 3.8 cars, including a 86 with a known good trans. Will that trans work?

Thanks
Chris
Title: 3.8 and 5.0 aod interchangable?
Post by: Beau on July 13, 2010, 01:24:41 PM
Quote from: a77cj7;328147
Just lost the trans in my 87 5.0. Didn't last long behind the new 300hp motor.

All my local jy has are 3.8 cars, including a 86 with a known good trans. Will that trans work?

Thanks
Chris


It'll be no stronger than the AOD you had behind the engine originally.


You could swap in a SC aod, they're stronger. Or have one rebuilt with a kit, and put a cooler on it, etc.

Just a thought, if your TV cable wasn't adjusted correctly, the tranny will die regardless of how careful you drive it. There's a lot of good info here on adjustment if you suspect that could be a cause..
Title: 3.8 and 5.0 aod interchangable?
Post by: a77cj7 on July 13, 2010, 02:17:07 PM
I'm not worried about it being stronger, as the old trans was already on its way out, not surprising with 180k miles.

I will be installing a cooler with the new trans, and probably a trans temp gauge.

The TV cable was correctly adjusted.
Title: 3.8 and 5.0 aod interchangable?
Post by: softtouch on July 13, 2010, 04:32:57 PM
From the 84 shop manual:
Forward Clutch;
3.8 & 5.0..4 steel and 4 friction.
5.8..........5 steel and 5 friction.

Reverse Clutch;
3.8 & 5.0..2 steel and 3 friction.
5.8..........3 steel and 4 friction.

Direct Clutch;
5.0 & 5.8..5 steel and 5 friction.
3.8..........4 steel and 4 friction.

Intermediate Clutch;
5.0 & 5.8..3 steel and 3 friction.
3.8..........2 steel and 2 friction.

Don't know if this carries through to 86 or not.
Title: 3.8 and 5.0 aod interchangable?
Post by: thunderjet302 on July 16, 2010, 03:09:07 PM
If you don't do anything to that AOD you're going to fry the new one as well. I would suggest at least a shift kit, hardened input shaft, a good torque converter (at least 2400 stall but maybe more depending on the mods you have), and a big trans cooler. My combo ate the stock AOD in the car and I had to have it rebuilt stronger. It wasn't cheap but now it's pretty much bullet proof.