Transfer case lowering, explain what it does?

980 · Feb 9, 2002

I am wondering about the "transfercase lowering" that is done to lifted jeeps. I have been looking in to driveline vibrations, and came across this as a solution or help. I have heard all about how many jeepers don't do it because of clearence.

I understand how it works on the drive shaft end, how it corrects the angles that the u joint works at...

What I want to know is how lowering the cross member can change the angle of the transfer case? Is it not bolted directly to the tranny, which is bolted on the block. There are not any universal joints between those I dont think?
Do the motor and transmision mounts flex and the entire Motor/tranny/x-case adjust up or down?
Can someone explain how it works?

Thanks very much
Tony

79 CJ 5, 258, dana 30, model 20, T18, dana 20, 2.5" rancho lift, 1" shackles

Guest · Feb 9, 2002

When you lower the crossmember holding the transfer case, the whole engine/trans/tc leans backward. This lowers the transfer case and lessons the angle of the driveshaft coming off the output shaft of the tc.

raymo · Feb 9, 2002

You are right on in your thinking. The whole drive train (engine/tranny/tcase)pivots on the motor mounts as the cross member is raised/lowered. This is OK as long as it doesn't put the fan through the radiator or the valve cover into the firewall.

It affectively gets the driveshaft closer to a stock angle between the pinion and rear output. By doing this it makes it so you may not need a new driveshaft.

As you pointed out, the lowering of the skidplate loses precious ground clearance, so it comes at a cost. It's cheap and easy, so it is often the choice with something like a 4" lift.

-raymo
4.6 Stroker Scrambler

Guest · Feb 9, 2002

Whenever I install a suspension on a Jeep, I ALWAYS take it for a test drive first to see if there are any vibes. If there is vibes, I will install the lowering kit, otherwise, it is kind of working to defeat the point of lifting a Jeep.

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Transfer case lowering, explain what it does?

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