[Moto]

Anyone notice a thump when they engage the trans. case into 4hi while moving? I just started noticing it.

 

[reaching.nulowz]

how many miles on your truck? may be time for a fluid change?

 

[Moto]

how many miles on your truck? may be time for a fluid change?

Just over 30k. The fluid is good to 100k as far as I know.

 

[rangerbob]

Mine thumps lightly ( sometimes ) - it's as the gears engage. Other times no noise.

 

[Moto]

Mine thumps lightly ( sometimes ) - it's as the gears engage. Other times no noise.

Thats what I figured. I just noticed the noise yesterday. Once at 65mph, and once at 35mph. I wasn't really sweating it, just wanted to make sure it wasn't a known issue. Thanks Bob.

 

[rangerbob]

It sounds the same as the noise when I shift into 4LO and I have to stir the gear box to get it to shift.

 

[brakenit]

I would assume this is somewhat normal, any play in the driveline between the transfer case and front wheels will cause it. You're going from the front wheels being pushed along to them pulling themselves. :shrug:

 

[rusty]

i never noticed anything going into 4 hi but i usually get some noise going into 4 lo

 

[greg larkins]

IDK, but are you supposed to do it at 65mph? i thought you had to be stopped so that the transfer case didn't jam the gears and fuck everything up.

 

[Moto]

IDK, but are you supposed to do it at 65mph? i thought you had to be stopped so that the transfer case didn't jam the gears and fuck everything up.

4lo yes. 4hi no. That's why they call it shift on the fly. Good call though.

 

[greg larkins]

Anyone notice a thump when they engage the trans. case into 4hi while moving? I just started noticing it.

your first post says 4hi

4lo yes. 4hi no. That's why they call it shift on the fly. Good call though.

and then what? so did you shift into 4hi at 65 then? i don't really know shit about 4wd trucks that's why i ask.

 

[SC]

Is it safe to drive in 4hi at 65? I was always told to keep it under 55.

 

[NORMSCOLORADO]

Is it safe to drive in 4hi at 65? I was always told to keep it under 55.

i have done it by accident and drove like 200 miles in 4 hi..... i couldnt even tell i did like 55- 65 mph the whole way...

 

[RiverboyGMC]

Mine makes a noise, I'd rather it be there. Lets me know its in :355:

 

[rune]

ive generally carry 4Hi upto about 65, I figure anything after that I dont need it, or conditions are shitty and I need to slow down... I will slow down to about 30MPH when I shigt it in though...i dont think running fast and engagin could be good...

 

[SC]

so what the fastest recomended for 4LO. I try to keep it under 10.

 

[FMRJPR]

Try backing of the gas a bit when you push the button, till it locks in 4hi. Seems to make an easier time for both front and rear drivetrains to match speed. If I don't back off I get a clunk. But lifting of the pedal for a second allows me to engage smooth as silk everytime.

 

[Moto]

your first post says 4hi

Yeah, I got it ass backwards. Sorry.

so what the fastest recomended for 4LO. I try to keep it under 10.

You have to have the truck in Neutral with the parking brake engaged to shift into 4lo.

Try backing of the gas a bit when you push the button, till it locks in 4hi. Seems to make an easier time for both front and rear drivetrains to match speed. If I don't back off I get a clunk. But lifting of the pedal for a second allows me to engage smooth as silk everytime.

Good idea. I'll give it a try. Thanks.

 

[rangerbob]

so what the fastest recomended for 4LO. I try to keep it under 10.

Our truck require less than 3 mph to shift into 4LO.