vibration at 65mph

[inline6er]

my son's 88' bronco II (2 wheel drive) automatic w/OD,v-6, has vibration at 60-65mph after he lets off the pedal. acceleration is smooth thru to 65, then starts after he lets off the gas. any ideas?

[rebocardo]

One thing that could be is an EGR problem (passages clogged), though I would be more inclined to think it is a torque converter/transmission problem.

Does it feel like a shuddering (transmission) or more like a shaking (engine)? Hard to describe in words, but, that is the best I can do on-line.

[inline6er]

tahnks for your eeply. it feels like the trans; just had the tranny rebuilt;the vibration doesnt start untill you let off the gas, and is the same from D to OD. the engine RPm dropps with no noticiable change in the vibration.

[tbolt 460]

check the u-joints

[mudslinging79]

i agree about checking the u-jionts, had something similar in a chevy. was so bad you could feel it through the transfer case stick