'90 BII automatic swap

Reply Subscribe

Thread Tools

Search this Thread

Aug 29, 2007 | 05:26 PM

coyote0003

Thread Starter

Junior User

Joined: Mar 2007

Posts: 53

Likes: 0

'90 BII automatic swap

I just bought a 1990 Bronco II with a junk A4LD tranmission and the electric transfer case. I have several Mitsu 5 speeds and manual transfer cases that I would like to swap in. Is there any glaring issues I will need to address?

Thanks for any and all help,
Coyote

Aug 29, 2007 | 09:55 PM

97Centurion

Rub my Belly

Joined: Jan 2004

Posts: 3,093

Likes: 1

From: Lawrence, KS

Drive shaft lengths might be different.

Aug 30, 2007 | 07:54 PM

coyote0003

Thread Starter

Junior User

Joined: Mar 2007

Posts: 53

Likes: 0

The trans and transfer cases I have range from 1985 to 1988. I have pedals, slave cylinder, drive shafts, and plenty of beer. My concern is computer. I know the A4ld was somewhat computer controlled. Now, the computer will not see the converter or shift solonoid. Will it trigger the light? I will have to emmision test. If they see a light, it is automatic FAIL. I guess I could put in a manual ECM, but only if I have to.

Aug 30, 2007 | 09:23 PM

97Centurion

Rub my Belly

Joined: Jan 2004

Posts: 3,093

Likes: 1

From: Lawrence, KS

I don't think I can drink enough to answer that one. But I was thinking the computers that's in the BII's didn't really read anything off the trannys. Not sure. I did swap out a Mitts 5 speed in mine for a C-5 and it didn't throw any codes. But I'm not sure if Timing Curves and Fuel curves are different between an auto and a stick.

Aug 31, 2007 | 07:32 AM

coyote0003

Thread Starter

Junior User

Joined: Mar 2007

Posts: 53

Likes: 0

Good point.....I did not think of fuel curve. I know timing is different between the two. If I recall, The the computers were kind of "dumb" and it took just short of a nucular reaction to trigger the light.

I am doing the swap this weekend.....I'll keep you posted

Aug 31, 2007 | 10:46 AM

mrshorty

Postmaster

Joined: Dec 2001

Posts: 3,742

Likes: 2

From: UT

A '90 A4LD will have a computer controlled 3-4 shift and torque converter lockup clutch. If the computer doesn't see those solenoids, it could throw a check engine light. The EEC-0IV computer isn't that smart though. It only needs to see a complete circuit. Others that I know of that have done this swap have simply wired in a cheap resistor (if you're keeping the old A4LD as a paper weight, you might just pull the solenoids out and plug them in) so the computer thinks those circuits are complete.

Aug 31, 2007 | 05:14 PM

coyote0003

Thread Starter

Junior User

Joined: Mar 2007

Posts: 53

Likes: 0

Great idea! Thanks

Turns out that my pedal assy is from a '87. Different dash = different pedals.....darn!!!! Then I find mounting ears on my slave cylinder are broken.

Dosn't look like we are plying in the mud this weekend.

Looks like I'm off to ebay for pedals and a slave cylinder