4wd hi is acting jankyyyyy

[1990comanche-he]

I have a 1991 4.0 swapped mj with 8.8 rear end. Just recently took her out riding and realized 4lo and 2hi work fine but if I go I to 4hi it dang near locks up and skirts the tires and pulls harrrrd right. Why would it do this is 4hi only?

[Pete M]

is 4lo engaging the front axle? 

[cruiser54]

Makes me wonder if there aren't 2 different axle ratios. 

[1990comanche-he]

In 4lo everything works great even on asphalt but 4hi seems like it wants to lock up the front end

[speeding_infraction]

What is your rear end gear ratio? Front and rear have to be the same.

[pizzaman09]

On 12/15/2023 at 2:25 PM, Pete M said:

is 4lo engaging the front axle? 

I'll quote this again.  Are you sure that 4 low is actually engaging the front axle?  Is it possible that the 8.8 ratio is different and you just don't notice the problem due to the low speed?