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post #1 of (permalink) Old 09-23-2000, 10:42 PM
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Front Differential

I have a relatively stock 1989 Chevt Ext. Cab Short Bed, 5 speed, 350. I bought it used a few years back, but have not done much 4 wheeling. I have replaced the thermal actuator on the front differential, but it appears that the slide gear is stuck. I have no 4 X 4. Short of tearing the front differential apart, is there some helpful hint on unsticking the thing. As they say, if you do not use it, you lose it. Thanks in advance for any help.

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post #2 of (permalink) Old 09-24-2000, 12:04 AM
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Re: Front Differential

When you put into 4x4 have you waited for a while? Mine takes a few seconds to engage others would probably have given up on mine. I just write it off to age and 4 wheel on.

88 1500 4X4 6 in. SUPERLIFT, 35X12.50BFG AT

post #3 of (permalink) Old 09-24-2000, 12:31 AM
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Re: Front Differential

Sorry this won't really help you any, but it's said that you should drive your truck in 4x4 offroad for about 15 minutes every month to keep it all lubed and working properly. When I am not able to take my truck offroad for a while, I just find a dirt lot somewhere and drive around for 15 minutes, some in 4hi, some in 4lo. Hope this helps and prevents future problems.

1992 Blazer Sport, 350 TBI, Gibson 3" cat back, 4L60, K&N, Rancho 3" lift, 285/75R16's on 16x8 Bajas [img]/wwwthreads_images/icons/laugh.gif[/img]
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post #4 of (permalink) Old 09-24-2000, 10:51 AM
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Re: Front Differential

Thanks for the reply. When I first noticed I no longer had 4X4, I did some checking and thought it was the thermal actuator. I found that the pre-90 actuators were weak and had been upgraded. I took the old one off, left it plugged in and saw that it did extend slowly, so it was working. I went ahead and put the new one on and found that it extended rapidly with more force, so I believe I was told the truth. I kept the new one. While the actuator was out, I did tap on the slide gear and found that it does not move, hence my problem.

I think yours could be fixed for about $100 at the local Chevy parts house and about 30 minutes. Make sure you get the newer actuator and it requires an adapter harness. I believe you will find it gets you 4X4 a lot faster.

post #5 of (permalink) Old 09-24-2000, 12:06 PM
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Re: Front Differential

I probably should have mentioned this yesterday, but there is this product called the 4x4Posi-Loc that sells in JCWhitney for about 160. It's a cable operated actuator for the front diffs on our trucks. I looked into it quite a bit before I decided on a solid axle conversion. I was quite impressed and definately going to do it. You shift the transfer case into whichever setting you want it in, then pull this handle you mount under the dash out, and twist it to lock it. BOOM, you are in 4x4. No waiting for the thermal actuator to start, shorting it out in water, it not being able to work in freezing temps, etc. You also can now have 2lo by just shifting the transfer case into 4lo and not using the handle. Definately worth it. I would do it, but I don't really want to put any money into the IFS if I am going to be getting rid of it. Hope this helps.

1992 Blazer Sport, 350 TBI, Gibson 3" cat back, 4L60, K&N, Rancho 3" lift, 285/75R16's on 16x8 Bajas [img]/wwwthreads_images/icons/laugh.gif[/img]
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