Truck is a 1996 Ford F-150 4x4 supercab XLT
5.8 351w, E4OD tranny. borg-warner 1356 electric shift.

Recently after doing a little mud slinging, nothing big, and not even revving high, I started hearing like a grinding noise while driving down the road, normally around 1500 rpm afterwards. However when the truck is in park I cannot make it make the sound. Considering that's the power band for this motor, I thinking it's in the motor.

I've already replaced the Hubs, inner and Outer bearings. At first thats what I thought it was. It sounded almost like a bearing grind.

I had thought about the motor, but considering I could not make it make the noise while in park, I ruled it out.

I have caught it doing it while in gear, but not in motion.

Any ideas? Really racking my brains.

 

sounds like something to do with the tranny....but im not big on autos...so thats about all the help i can be

 

Yes I also getting a little thought it is your tranny. it's a automatic? And I have manuel 4.9L and it grinds on 3rd gear when I switch it but it's the sycros.

 

That scares me... I would lean towards the tranny too.

 

I agree. something with the tranny. Is it E4OD? might be rebuild time

 

man these manual trannys can go forever on bad syncros if you drive accordingly...take it easy and i bet that tranny will still last as long as the rest of the stuck...unless other stuff goes too...my syncros are completely shot...and the shift forks are bent...and that what i know of...and i can still drive daily LOL...it only goes into 3rd when it wants though...and going from 2nd to 4th is getting old...getting a new tranny and NP-205 t-case this week

 

Well thats the thing I just had the tranny rebuilt last year. Since it has the same housing as the F-350's I had the tranny guy beef it up a little. Well, he seriously beefed it up with a serious after market torque converter, and a Stage 3 extreme shift kit. But if there's any problems with the tranny, this particular automatic tranny, the O/D light will flash. Damn elctronics.

However on a brighter note, I looked at the motor mounts. THEY ARE SHOT. There's actually an indention in the firewall where the tranny has been hitting. I have both motor mounts and plans to repalce them satruday.... Give an update then.