I have in mind to build my 85 IROC to about 300 hp (yes I know its a 305) but it can be done. My transmission was rebuilt a year ago so I consider it to be in good condition. My question is those of you that have added power to older IROCs how much power will the stock transmission hold up to? And for how long? Thanks.

 

Not all rebuilds are created equal. A properly built 700R4 in an 87+ case can hold a good deal of power.

 

My IROC had about 60,000 miles on it when I put a single fogger nozzle in the rubber in front of the throttle body. Tranny lasted about a month. Maybe 240 hp total.

Since yours if fairly fresh, it might go 2 months. lol

I thought I was hot sh*t going from 15.90s to 15.0s on a 50 shot, until my friend pointed out that I was the only guy in town who couldn't go a 14 on nitrous.

 

so then how do go about making the car handle 290hp?

 

I would suggest contacting Dana @ Pro-Built Automatics http://www.700r4l60e.com
Bill

 

thanks a lot...looks like a good website.