rear diff. fluid change

[z28_81]

so i have a 01 z28 4a with 75k on it... ibought the car used with 45k on it back in jan.05. i dont know if the previous owner ever changed the fluid. will it hurt my diff. if i change it now???

also which diff. does my car have ...torsen or aurburn??

is this all i need to change it..
2qts m1 75w90
gasket
high temp sylicone
gm additive.

do i need a torque wrench to tighten the bolts?? and whatsequence should i tighten the bolts to get a proper seal???

[thearborbarber]

You should have a torsen diff. Either way you have the right supplies to service both. Tighten the bolt is a criss cross manner as you would a tire. I used a torque wrench and 25 foot pounds. But it's not nessessary.

[z28_81]

You should have a torsen diff. Either way you have the right supplies to service both. Tighten the bolt is a criss cross manner as you would a tire. I used a torque wrench and 25 foot pounds. But it's not nessessary.

will it hurt my diff. change the fluid now at 75k?? lets say if it hasnt been done ever??

[c5z28]

will it hurt my diff. change the fluid now at 75k?? lets say if it hasnt been done ever??

It won't hurt at all, your doing a necessary service. Make sure you have some sort of pump to fill it back up otherwise its a real bitch to get in there.