first time 4x4

[Shav0]

89' GMC Sierra with 33's.

Travelling at the same speed, when 4x4 is engaged my truck turns about twice the RPM as it would in 2 wheel drive. Obvousily it's going to have to work harder so that could account for some incrase in RPM's, but is this totally normal? This is my first 4x4 so Im just getting used to whats normal and whats not. Also, the 4x4 has a whine noise too when your going slower, but goes away when speed increases, again, this normal?

 

Also, I know that I have to be stoped to engage the 4x4, but can I come back into two wheel drive "on the fly" ?

 

thanks in advance

[shorepatrol2]

souds like you had it in 4LO, in 4HI you shouldn't notice any RPM difference

[Shav0]

souds like you had it in 4LO, in 4HI you shouldn't notice any RPM difference

 

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no it was 4HI

[WindyCityPilot]

souds like you had it in 4LO, in 4HI you shouldn't notice any RPM difference

 

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no it was 4HI

 

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Somethings not right then. 4HI will not increase the RPM's over what you would see in 2HI. 4LO you'll definately notice the difference.

[yukon4wd]

Naah you must have been in 4Lo

[asilverblazer]

The torque convertor probably unlocked, causing a blip in the rpm's but not double.