I have checked all the motor and transmission mounts and universal joints and can find no problems there. What else might cause this? Thank you.
2006-08-21 11:35:29 · 7 answers · asked by niceguy 2 in Cars & Transportation ➔ Maintenance & Repairs
It has a V6 w/ automatic & a swing-bearing drive shalf.
2006-08-21 11:36:29 · update #1
You don't tell us what year or model, BUT
Wear in the drive train and excessive idle both can contribute to this jarring thump.
The reason for this is somewhat mechanically technical, but because we don't use R all that much (in comparison to D) there are fewer clutches for Reverse than for Drive. So to be sure to fully engage and not slip, the transmission doubles the line pressure to these clutches so that they are as secure as possible. When they do engage, sometimes, if the idle is higher than normal, or if the transmission oil is due (or overdue) for a change, this is one of the signs.
Also check out that center support bearing and its insulator as well.
Finally, check to see that there is plenty of oil in the differential. If it is low, there won't be any oil to cushion the shock of the pinion mating up to the back side of the ring gear.
2006-08-21 11:49:08 · answer #1 · answered by Ironhand 6 · 1⤊ 0⤋
Hum let me guess,long bed or extended cab 97-04 f-150 (heritage)
Known issue.. Normal as someone said .. you can put some slip yoke grease in the drive shaft tube where it inserts into the back of the transmission but should take care of some but not all noise... Most trucks will do that after a time...
2006-08-21 15:31:51 · answer #2 · answered by gearbox 7 · 0⤊ 0⤋
It is probably slack in the gears of the rear differential. As they wear, they tend to have a loose fit and don't tightly mesh like when they are new. Idle may be set a little high and the slack is rapidly taken to the opposite side of the gear groove. Older vehicles with a lot of miles usually are prone to this condition, there is nothing you can do other than changing gear sets. Also, the bearings in the gear cluster may be worn as well............does the rear diff. howl when going down the road? If so, you may be changing your rear- end in the near future. Good luck !
2006-08-21 13:36:37 · answer #3 · answered by turbietech 4 · 0⤊ 0⤋
I took my truck to the dealer for the same issue. They checked the drive train front to back and the final diagnosis was "Its a Ford!" normal sounds for a light truck.
2006-08-22 00:23:28 · answer #4 · answered by N e 3 · 0⤊ 0⤋
This is common on most fords. Shift pressures are high for good engagement. My Dad had a 1978 Tbird, and always did that. He said it was normal.
2006-08-21 11:46:55 · answer #5 · answered by Silverstang 7 · 0⤊ 0⤋
check your transmission sensor
2006-08-21 12:27:35 · answer #6 · answered by cwgrlmeiniowa 3 · 0⤊ 0⤋
transmission
2006-08-21 11:44:01 · answer #7 · answered by Z-Cat 5 · 0⤊ 0⤋