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I would guess that there is a vacuum leak somewhere. At higher RPM's the engine will produce less vacuum. If there is a leak, there may not be enough vacuum to keep 4wd engaged
 

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No, but you shouldn't be punching it in 4x4 either...
This. Plus, do you loose the front dif when it happens or does it stay 4X4. If you don't loose it maybe just a vacuum issue under those circumstances. If you have 4X4 and the light stays on during normal driving in 4 wheel drive, don't punch it.
 

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Discussion Starter · #9 ·
kik said:
This. Plus, do you loose the front dif when it happens or does it stay 4X4. If you don't loose it maybe just a vacuum issue under those circumstances. If you have 4X4 and the light stays on during normal driving in 4 wheel drive, don't punch it.
I don't notice the loss of the front diff because it is just for a second or two.
 
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