Does anyone know the topspeed in 4h?
Where does the vacume line go to the one from the front differential

 

I don't know that max speed but I have gone 120k and wouldn't recommend it or going faster.

 

I was about to say 120 mph? XD BUT then I saw the (k) so basicly 75 mph hmm

 

Personally I'd never go over 50mph in 4wd it really depends on the vehicle. My old pathfinder wasn't supposed to go over 35 in 4h.

 

60 pushin it man. Its not worth tearing your transfer case up. If its snowing or iceing. Than you shouldnt be going over 40 anyway.

 

Idk if your owners maunal has it but mine has a book called "four wheeling with ford" it says in there you should not exceed 50 mph..

 

35MPH 4L.... 55MPH 4H...the vacuum lines go to a soleniod which your selector switch controls.

 

Im in Canada so my 100kmh-120kmh is your 50mph-60mph.

 

100 Kmh = 62 MPH does it not ??

 

According to the user's manual you must be going 55mph or slower to switch into 4H, so I would assume 55mph would be the fastest you should go. Not sure why you would be going even that fast and need 4wd unless you hit and unexpected patch of snowy weather or something, but I would suggest slowing down once in that situation.