1987 Ford Bronco II Malfunction - Drive Train & Driveline


Question: Hi. I have a 1987 Bronco II with an automatic transmission. 240, 00 miles and minimal problems until now. About 6 months ago when the weather turned cold it began having trouble shifting into 2nd gear until the engine/tranny warmed up about a mile down the road. Then last night going up a hill it just started losing power. The engine didn't seem to be turning the transmission at all. I made it to a parking lot and let it sit for a few minutes. I started it again, put it into gear, and it moved out fine. However, when I stepped on the brake and went to turn onto the street again, all power was gone again. So I shut it off, let it sit and cool, then started it again. It went into reverse fine, got me to a parking spot, but when I hit the brakes again and let off, all power was gone again. I got it home by towing it. I messed with it again this afternoon and it went into forward gears initially. It didn't care when I stepped on the brake. It went into reverse once after a 2 second pause, then it wouldn't go into reverse at all. Also, It has plenty of fluid, maybe a little too much even. If it makes any difference, I had the transmission fluid flushed and replaced for $60 about 20, 000 miles ago. I think they used Dextron-mercon fluid like it says on the dipstick. Thanks in advance for your help. You have a great site. After 2 hours on the net looking for info, your site is the best I've found. Rob Hamilton

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Technican: Unless the filter is plugging and starving the pump for fluid you have serious trouble that will require a rebuild or replacement. It sounds like you had a faulty valve (they had their share of problems) for shifting to 2nd, but now have worse trouble like pump failure/etc. All I can really do is speculate from here, sorry I don't have better news. You could remove the pan on the transmission and see how much junk/debri has collected- if you find 'chunks' it's a sign of serious damage. Some people try additives like Lucas TranX (and another popular brand I can't think of at the moment)to 'fix' a failing trans, I don't think it'd help your problem but thought I'd put all options on the table.

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