MickeySpiers
Elite Explorer
- Joined
- July 31, 2001
- Messages
- 140
- Reaction score
- 0
- City, State
- Littleton, Colorado
- Year, Model & Trim Level
- 1991 XLT
So the wife's ride now has an electronically switched 4406. Sooo nice driving that thing in the snow now. However, it has a few problems. First, the speedometer is way off. It reads much faster than the truck is actually moving. The tags on the 4406 read D 10 7 3 which I assumed matched the 3.73 gears I have, but it's obviously off. The Expedition I pulled the case from had no motor (no front end at all), transmission or axles. Just a transfer case sitting in the skidplate with a front driveshaft & wiring harness attached... The speedometer gear housing on the new case was broken, so I pitched it and swapped my old housing with gear onto it. It was a different color, tho at the time I wasn't smart enough to pay attention to which was what so now I have no idea. I'm guessing that my transfer case is setup for a 4.10 equipped Expedition. The driveshaft didn't fit, so I'm guessing the Expedition had a 5.4. Anyhow, can I just go to Ford and ask for a speedo gear for the 4.10 Expedition & be back on the road, or do I need some fancy calculations because the axles don't match what the transfer case thinks it is?
Next thing is the horrid drivetrain shake that came along with bolting up the front driveshaft. Driving around with only the rear driveshaft, it was shake free 'till highway speeds - I assumed this was because I'd accidentally whacked the rear shaft with a sledge while removing the junkyard U joints and knocked it out of balance, which didn't show until about 70. The front shaft looked good, tho it shakes and shimmies from 0 to about 50 now, leaving my wife with a nice ride from 50 - 70 only (which is, apparently, about 35 - 55 real world speed since the speedometer is off). Anyone know how I can test a driveshaft for true or balance, short of taking it to a shop & paying more than I did for the shaft from the boneyard?
Thanks for any ideas...
Next thing is the horrid drivetrain shake that came along with bolting up the front driveshaft. Driving around with only the rear driveshaft, it was shake free 'till highway speeds - I assumed this was because I'd accidentally whacked the rear shaft with a sledge while removing the junkyard U joints and knocked it out of balance, which didn't show until about 70. The front shaft looked good, tho it shakes and shimmies from 0 to about 50 now, leaving my wife with a nice ride from 50 - 70 only (which is, apparently, about 35 - 55 real world speed since the speedometer is off). Anyone know how I can test a driveshaft for true or balance, short of taking it to a shop & paying more than I did for the shaft from the boneyard?
Thanks for any ideas...