Folks,<br><br>I noticed the other day that my old truck pulls to the left when driving on pavement in 4W drive high. Any ideas on what that might be?<br><br>In 2W drive and the hubs unlocked, she's straight as an arrow. I kinda have the feeling she pulls a little to the left when the hubs are locked in 2W drive. Not nearly as bad as when in 4W drive.

I wouldnt use 4WD on dry pavement.Part time systems bind up when on grippy surfaces and can break various parts.Full time systems use a viscous coupling that allows internal slippage so you can turn corners on asphalt without damage (ex. all Subarus,Toyota All Tracs,the 1980 AMC Eagle,70s Dodge's,Full-time 70s Ford F-series and 78/79 Bronco,etc...)

Well, there could be several things involved here. Real basic - have you checked your tire pressure between the front two tires? Is it the same. I know, I know, it's too simple, but you would be surprised at how many people find their tire pressure is low. Next, is your brake pad or shoe not releasing on that wheel. I don't know whether you have disk or drum brakes, so I really can't go any further on this one. Next, is your universal joint on the front left axle shaft still the original? Most are. And, most can't take too much heavy off-roading when installed on a light duty truck with larger tires. I don't know the year or model either, so if you could provide some more info, I might be able to help you explore a little deeper. Check your tires for uneven wear while you're looking around up there too. <br>By the way, don't worry too much about driving in 4-wheel drive on pavement, although it is not good to press your luck, as long as you don't try to perform hook-slides at 30Mph+, you're not going to break a heck of a lot. To test your vehicle and drive between ice and dry pavement, the 4-wheel drive will work just fine.<br>Tommy

Tommy,<br><br>My truck's a '69 Bronco. I don't think it's the tire pressure or the drum brakes. I only pull to the left when in 4W drive. In 2W drive it's just fine. Drives straight as an arrow. The tires are evenly worn.<br><br>I replaced the U-joints and the front differential ring and pinion last year. (I think the guy that owned it before me was doing hook-slides.) The transfer case and the hub locks are still original.<br><br>Jerry

Jerry,<br><br>First, try to lift the front axle off the grond and spin the left wheel. It should spin freely. Next, lock in the hubs and spin it again. You should be able to notice any binding from this. Remove the left wheel and drum and try to spin the axle again. This should tell you if it is the brake shoes or not. If not, you will have to open the hub and inspect the grease and mechanical parts inside. Is the grease gummy? Any damaged hardware? It may have gotten dirt or water in it - potential problem. If everything looks fine there, then you will probably want to look at the spider gears in the differential. A bigger job, but that is where this is leading. If there is some damage to the spider gears inside or if they have some gunk in there, that may be the problem. Really, this should be a fairly simple one to find. Just get the wheels off the ground so you turn the axles and start investigating. Take it one step at a time and you should be able to find the source.<br>Tommy

Seems like one possibility is torque-steer, similar to what happens in a front-wheel drive car. The shorter of the two halfshafts has a more immediate response under load and causes a pull. The same may be true of a 4WD front axle. This would only happen when the front axle is engaged. You might not notice it ordinarily, since the 4WD isn't meant to be engaged on dry pavement. During 4WD operation, the wheels need to be able to break free of one another, as they would on snow, mud, etc. Otherwise, there may be binding, pulling and other adverse handling characteristics.<br><br>Just my $.02. Good luck and take care,<br>Dan

IF THE PULL COMES DURING ACCELERATION, AND SEEMS LESS APPARENT OR GONE WHEN COASTING I AGREE THAT IT IS TORQUE STEER.

ive had this problem check your axles could be broken its happened before check left sides