Differences in catalytic converters? 92- 93?

[canadianwheeler]

My cat needs to be replaced and my buddy has one with very low kms left over from when he did his exhaust. His cat is from a 93 zj which is the same part number as a 93 xj..... The problem is my xj is a 92 and looking online at napa's part numbers they are different?

Why is there different part numbers for a catalytic converter from 92 - 93? Did jeep do somthing different to the catalytic converter for different years?

 

[89Daytona]

You have access to both cats, take a look at them.

From the NAPA website it looks like the 92 has a flange on it and the 93 is a slip fit.

92

Inlet I.D.:4 Bolt Welded Flange
Outlet I.D.:2 1/4" O.D Slip Fit
Length:21 3/4"
Body Type:Standard Oval

93

Inlet I.D.:2-1/4 " ID
Outlet I.D.:2-1/4 " OD
Length:22 "
Body Type:Large Oval

 

[canadianwheeler]

The 93 cat has a o2 after the cat. On my 92 it only has one before the cat on the down pipe.

 

[89Daytona]

The O2 sensor should be before the cat not after on pre OBDII vehicles, OBDII vehicles (post 98) will have the downstream and upstream oxygen sensor