i thought i had it all figured out! (2wd to 4wd)

[Weezel]

So i FINALLY get all my front end bits together and in and lifted. back it out of the driveway for a tour around the block and GRIND!!! wtf? oh ya the calipers from my 2wd axle won't work with the 4wd axle!!! i could have sworn someone told me they would work.... maybe it came to me in a dream. well i guess i'll have to swap them over from the doner xj.

anyone have any tricks for getting the hard line detatched from the flex line? mine are siezed!! crapola!

 

W

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[DirtyComanche]

Heat, and lots of it.

 

 

 

One of mine broke though, so I had to reflare it.

[Weezel]

i sprayed the hell out of them with fluid film before i packed it in for the night.... ill put the heat to them tomorrow!

 

W

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[jbhill]

pb blaster. spray it real good and let it set for about 5/10 min.line on the caliper or on the truck?

[Weezel]

its the line on the truck, the flex lines are different for each axle too!

 

W

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[jbhill]

get some pbblaster soak them. also make sure you invest in some line wrenchs so you won't strip it and have to use visegrips...

[Pete M]

What year is the donor axle?

[Weezel]

it was a 94 xj... i was told the calipers would bolt up, they are definetly different.

[Pete M]

I knew the 2wd and 4wd rotors were different, but maybe there was a change, like in 91 or something like that?

[Weezel]

the rotor actually rubs the inside of the caliper... pads, flex lines, caliper castings, piston, well everything except the bolt spacing. not a big deal to change but it might be a major PITA! Will heat hurt the lines or fittings?

it may be the only way to get them out. seemed to be pretty seized.

thanks

 

W

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[jeepthing07]

I'm doing a 2wd to 4wd conversion on a 89 comanche with a 89 cherokee axle. the brakes did change in 91. i just bought new calipers before my swap began so i hope mine work with the 4wd axle. advance auto parts don't show different part numbers for 2wd/4wd for 89 year

[Weezel]

My mj is a 91 and the donor was a 94 xj

[jbhill]

yea i was about to say, y not just buy new lines...

[partsmj]

I put a 92 axle into an 89 complete. The line threaded into the 92 hose with no problem.

[Weezel]

its not the lines, its the caliper, i have replacements from the donor xj... i just know the hard lines are seized into the flex lines. don't want to twist the hell out of the hard lines when trying to take them off!!

 

W

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[DirtyComanche]

Just cut them and reflare them. A flaring tool is like $10. Chances are they're so seized there's nothing you can do about it.

[Duner]

Just completed the 2wd to 4wd and 4" lift to my 90 comanche. We swapped an 89 4.0 cherokee D-30 into the mj and fortunately the new calipers I had on the old 2wd setup match the 4wd axle exactly, but I don't doubt that the late models have had improvement in their brakes.

 

As soon as I complete the soa conversion on the D-44 I'll post new pics. I have read a number of differing stories as to the spring perch measurements between the mj and xj, I can only state that my 90 mj M-35 is 42" center to center and the 89 xj D-44 is 44"

[Weezel]

just did the caliper swap, fluid film and some heat along with a little patience and they came right off. thanks for everybody for your input.

now its heading to the spring shop for some lift in the rear and a badly needed alignment!

 

thanks again

 

W

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