Need help understanding...

Manimal

NAXJA Forum User

Location

SoCal

• Dec 31, 2009

• #1

I have a feeling this may sound stupid,"BUT".....I am not understanding the transfer case drop theory. Wouldn't it increase the angle of the front driveshaft? It seams that you're robbing peter to pay paul..? I have had many 4wds but all where FS chevy and Ford,OH and I do have an '87 Grand Wagoneer too. and I have never heard of installing a transfer case drop...? Please ed-u-kate me. Thanks
-Lance

 

GrimmJeeper

NAXJA Forum User

Location

Gardena, CA

• Dec 31, 2009

• #2

the transfer case drop lowers the entire transmission cross member, efectivley dropping the tcase and trans, and raising the front of the motor slightly. since it is lowering the front and rear of the tcase the same amount, I dont see how it would increase the front angle.

The main purpose of the drop is to get the slip yoke on the rear output to push back into the tcase just enough to eliminate vibration. the front can handle the angles because of the double cardon joint.

 

Manimal

NAXJA Forum User

Location

SoCal

• Dec 31, 2009

• #3

Forgot about the double cardan joint, Ok Thanks. See I said it would be stupid.
-Lance

 

S

SanDiegoOverland

NAXJA Forum User

Location

San Diego

• Dec 31, 2009

• #4

Manimal said:

Forgot about the double cardan joint, Ok Thanks. See I said it would be stupid.
-Lance

Click to expand...

nah, not stupid.

good question to ask before you jump into modifying your suspension or drivetrain.

 

cal

NAXJA Forum User

NAXJA Member

Location

Hammertown, USA

• Dec 31, 2009

• #5

Good question, and you're right, it does increase the front angle.

The front driveshaft can take it though, where the rear needs the help.

 

techno1154

NAXJA Member

NAXJA Member

Location

In the islands

• Dec 31, 2009

• #6

cal said:

Good question, and you're right, it does increase the front angle.

The front driveshaft can take it though, where the rear needs the help.

Click to expand...

Cal is 100% correct. In addition, when I did this, the cross member dragged a lot going over obstacles .
When I lifted my XJ the first time, it was only a 2" budget boost. To get rid of the of the vibes, I dropped the cross member 1". For offroading I ended up with only 1" of actual lift. I now have an HD sye and aTom Woods double cardan drive shaft. The 'T' case is at the OEM height and no vibes.

 

ehall

NAXJA Member

NAXJA Member

Location

Southern Maryland

• Dec 31, 2009

• #7

Yeah the angle is determined by the motor mounts and crossmember, so if you drop the crossmember the forward angle gets steeper. This is why it's supposed to be a short-term fix

 

CherBear

NAXJA Forum User

Location

Indiana

• Dec 31, 2009

• #8

Ok heres a dumb question:

Why cant we put a double cardan joint in the rear?

 

C

ChiXJeff

Curmudgeon

NAXJA Member

Location

SE MN

• Dec 31, 2009

• #9

We do. Look at an SYE equipped XJ. Double cardan joint at the tcase, single u-joint at the rear axle.