drivetrain slop

[garretthoehn]

Well i have an issue with my drivetrain in my 99 F-250 4x4 that has a zf6 6 speed trans and i have alot of play some where but i cant pin point where it is coming from, the play is extremely noticable between on off throttle, i only get it when i let off the pedal and when i put my foot back on it, and it jerks real bad when you do that, i dont know what would cause it t-case, trans or rear end, it also does it in 4 wheel drive too, any ideas will help......

[B4SouthernMiss22]

from the sound of what your saying i would probably start out looking at the u joints. or do you think its in the trans?

[garretthoehn]

well i recently replaced all of them hoping that it would solve my issue, im a little iffy about thinking it was in the transmission because i dont know what would have that much slop in the trans, and it happens in every gear...

[B4SouthernMiss22]

how many miles is on the truck? does it do it in reverse? could be a rear end issue

[garretthoehn]

yes it does it in reverse as well, i have 196000 on it, i know that i need to rebuild my factory limited slip unit because it no longer works

[late_99_PSD]

Chock the wheels, put it in neutral, and go under the truck and see if you have alot of play in the drive shaft. If so then you problem is in the rear, if not then its in the trans or transfer case

[garretthoehn]

how much is considered alot? i know that every rear end has a minor amount of play

[late_99_PSD]

An 1/8 of a turn would be alot, but I'm not sure how much is too much to cause driveability problems.

[garretthoehn]

ok well i just got under my truck and i can only move it maybe 1/8 or 1/10 of a turn, and i did notice that my u-joints will move side to side about 1/16 to and 1/8 of an inch..... i just replaced them a year ago

[late_99_PSD]

Yeah you need U-joints. They should have 0 play.