I changed mine over from a 6 to a 8, in my opinion the best thing to do is change everything, I moved mine up to the 8 holes, got the right z bar, extended the driveshaft, get the proper steel mounts for the motor mounts, now on mine i had to get a different crossmember to move the trans up, the 6 trans crossmember and 1 I found in a yard for a 8 truck were different, I am very happy with the results, if you leave it in the 6 holes the engine will be close to the firewall, I dont like that, the only way anyone can tell my truck was a 6 truck is to look at the vin,,,,,,,If im right the z bar wont work at all, If I recall the z bar for a 6 is longer than the 8......
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