98 ranger strange vibration

[Liberto]

i was coming home from work tonight and i passed a car on the right ( they were turning into their driveway) and i thought i hit a rumble strip... it lasted only for about a few seconds... half mile down the road it happened again this time i was perfectly straight... it didnt go away in a few seconds so i put my transmission in neutral ( automatic trans) still no go... i put it ack in drive gave it a little gas and slowed down and it stopped... i havent been able to reproduce this problem... could anyone point me in the right direction? this has to be a reliable truck

 

[strvger]

wow. i'd start with checking all your u-joints. probably not a bad idea to check all the engine/tranny/tc mounting bolts as well while you're under there. good luck!

 

[Liberto]

U joints would be a constant vibration as well as all the mounts right? I thought it was my E-fan but this was a hell of a vibration! (and I checked the fan it's not broke and the mounts are still tight). I tried to reproduce the problem lastnight doing all kinda of driving n it didn't do it again...

 

[Liberto]

is this a transfer case problem? maybe a switch or solenoid?

 

[strvger]

got me there. mine is all manual... tranny and tc.

 

[Liberto]

I unplugged the motor on the t-case it's still doing it... But... It only happens between 15-50mph, it usually happens after I hit a small bump AND it only feels like the right front is the problem area... I'm thinking it's a malfunction with the shitty vacuum hub?

 

[strvger]

swap them for manual hubs and see what happens. the auto hubs tend to be problematic anyway it seems.

 

[Liberto]

That's what I've been reading but I haven't heard any problems about themare engaging while driving. Only seen problems with them NOT engaging or staying locked in all the time so... I donno. Eitherway I do have a set of AVH's in route to my house