i know that it's popular to get a comptech reinforced diff or an AP2 diff when you upgrade your final drive gear. should i be worried about any problems if i keep my stock AP1 diff and put a cryo treated 4.77 in? i DO NOT launch or dump my clutch at all.

 

If you were fine with a stock diff housing before, you'll be fine with one now. I have the Comptech housing and it was pointless since I never launch either.

 

No worries, if you are none abusive to the rear. If you get a quality install and use good 90w fluid the rear will give you years of service. Up grade the clutch and go do a few hard shifts and then you may see an issue. And as for the 04 diff being any better The cap has a revised design that is a bit more square but, not any stronger in my opinion. Comptech no longer makes the reinforcement you will have to get a used one or a generic one that is now being produced.

 

^^i did purchase the heavy duty ACT with street disk, and lightened flywheel. will this affect the reliability of the 4.77 diff??

 

It will be a bit more taxing on the rear end during hard/quick shifts, but I don't see that being enough to kill a stock housing.

 

up to "but I don't see that being enough to kill a stock housing".

That clutch setup has a 70% over stock clamping force. You will have to feather the clutch to keep it from banging the gears. A clutch upgrade only moves the week link to the rear. You will just have to be mindful of what you are doing

 

I think the ap1 and ap2 housings are identical except for a tempering change. You could have the ap1 housing itself cyro'd. And if puddy is sucessfull with his new caps you could add those too.

fltsfshr

ps I love my centerforce clutch and the way it works with 9g

 

so how do you guys recommend i reinforce my AP1 housing to accomodate this?

options so far:
-cryo treat the AP1 housing
-get a comptech reinforced housing
-get some other reinforced housing

 

btw comptech does make the housing again I got the first one a month ago

 

Like puddy says, if you're not going to dump it you're fine but I have to tell you I blew one apart hitting SECOND racing a porsche. That was with 444's 310rwhp and an ap1 housing. My hp is now 50hp+ higher with 457's and a cyro'd housing I haven't been able to break it with lots of launches.

fltsfshr