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Discussion Starter · #1 ·
Hello there I own a 07 SRT-8. I recently purchased a bwoody CAI, Kooks headers, Borla type-s catback exhaust, billet tech catch can and am looking at getting a cutsom tune from Toona once I get everything installed (Hey it's a start :p). I am wondering at what point a guy needs to start worrying about blowing up the rear diff and the tranny in terms of horsepower. I would think with my relatively minor mods I should be ok but I am not an expert. If anyone has any insights it would be appreciated. I have seen some pretty insane numbers on these forums and even had the pleasure of having my ass handed to me by chippy in his murdered/blown SRT8. I hope to get there within a couple years but I am going to take my time with this.

Thanks for your time,

Tim H
 

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The Traveler
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With that setup you could break the trans by hot lapping at the track. Heat is a big factor for tranny longevity. Bolting on 100 Hp you will start to see problems IIRC. 150 Hp you should start saving for a new trans. Could swap the valve body but that's just a temp solution. Eventually it'll start to slip.


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What he said , track passes specially over lapping is what will cook your clutches , IMO if you bolt on a supercharger and drive it normal getting on it once in a while , think it will hold up just fine , even making a few track passes which I'll say again , cool off in between passes .
 
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Once you get some SERIOUS power it will be time to start saving up for a tranny. As soon as you throw on a supercharge just have it in the back of your head...
 
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What he said , track passes specially over lapping is what will cook your clutches , IMO if you bolt on a supercharger and drive it normal getting on it once in a while , think it will hold up just fine , even making a few track passes which I'll say again , cool off in between passes .
Exactly what Paulo said. It's all about keeping the transmission cooled down. At high temperatures, no matter what HP its at, you are still liable to break it.
 

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Discussion Starter · #6 ·
Appreciate the info fellas. This forum has been extremely helpful. Great folks!. They just got rid of the track near my place so she won't be seeing a track anytime soon. She's my daily driver. I do like to get on her from time to time ( a lot haha). Hopefully that won't make the tranny too hot. Obviously it's pretty short runs at WOT as the speed limit goes by pretty quick :). Next one is definitely a supercharger. So the tranny is the weak link?. What about the transfer case/differentials when you start hitting the big numbers (7-800hp). How much does the upgraded tranny run a guy?

Thanks again guys. Tis appreciated!.
 

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PWR 440
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You will start having problems after 500hp if you play with the go pedal alot. Guys are running 10s on the stock diff so I wouldn't worry about that especially up here!!!

It sad they shut down race city! But castrol ain't too far away from you.
 

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Exactly what Paulo said. It's all about keeping the transmission cooled down. At high temperatures, no matter what HP its at, you are still liable to break it.
OP, I destroyed my trans with the mods you are going to put on but I run road courses. So read what Paulo and John have written. The above is good info. Figure between $4-5000 for a trans.
 

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Blew my trans with the basic vortech and a cmr tune. Cost with install, convertor, flex plate and trans fluid and flush was right around 7500 with shipping.

Worth every penny, but it's expensive.
 

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Exactly what Paulo said. It's all about keeping the transmission cooled down. At high temperatures, no matter what HP its at, you are still liable to break it.
OP, I destroyed my trans with the mods you are going to put on but I run road courses. So read what Paulo and John have written. The above is good info. Figure between $4-5000 for a trans.


Drive easy, and you are good.....like John (jps), LOL.
 

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im still on stock tranny..will be running the truck at the track for first time in march..hopefully it holds up wont be hot lapping will let u know what happens.
 

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Ypu will be just fine , i would trow in a BBill Stage 2 VB .
 

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I think you definitely risk breaking your stock transmission once you add a supercharger. You can fry the trans with just street driving once you get that much power. Take it to the track a few times and I think you would be lucky if it didnt start to slip.

I have broken 3 transfercases, a transmission, and a rear diff. But I did this by driving the CRAP out of my Jeep. I dont mess around... I drive pretty hard on the street and even harder on the track. I wont be hot lapping any more though! Never again...

IMO you are pushing the stock trans to its limit once you add a supercharger. You will probably loose 2-3 shift before too long. So I would consider being prepared to replace the trans if you go F/I, just to be safe. But I also wouldnt fix it unless it breaks ;)
 

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Marathon Man
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I say just get bills valve body for now. After you get to over 500 HP to the wheels, start saving up for the full trans cause it won't be long until you will need it.

And just like others have said. Let the trans cool down before you run it again at the strip.
 

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I'm gonna find out soon what she can hold. Stage 6 turbo and the stocker tranny might be a recipe for disaster! I'm already crunching numbers for the tranny. Can you say extra job! :D
 

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Discussion Starter · #16 ·
I'm gonna find out soon what she can hold. Stage 6 turbo and the stocker tranny might be a recipe for disaster! I'm already crunching numbers for the tranny. Can you say extra job! :D

Sounds like I am on the borderline. I am thinking she might grenade on you! haha. Good luck man!. I will start saving my pennies for the valve body swap looks like $600 according to his website. Probably don't need it just yet for my setup but I like being proactive. I looked at the transfer case and diffs. The upgraded diff is 5k!. The high torque tranny was cheaper. I think I will upgrade the tranny at the same time I do the blower.... it'll be pricey but I like the peace of mind. Thanks again for all the help guys. Interesting topic. Lot's of really good info in here.
 

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Bill's valve body is a good starting point to reinforce the tranny for now. Run it 'til it starts slipping (like stated, you'll notice 2-3 first most likely) and replace it - done. Keep your transfer case fluid changed every 3K miles if you race a lot, no real upgrades for it - it's actually already a pretty solid unit - chain will be the thing you'll replace, maybe main bearing, too. Skip at Demon Performance has great deals on WaveTracs right now...

Also, a transmission cooler never hurt, especially or the money - LINK.
 

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The Traveler
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BBill has a built transfer case


Sent from my iPhone 4S
 

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BBill has a built transfer case


Sent from my iPhone 4S
True, but what inside of it makes it better than our stock one? Don't get me wrong, I'm a fan of Bill's products, no question they are great, but the 1 year warranty is the only selling point for me.

Search for sarge's thread about rebuilding his transfer case - good information there.
 

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Discussion Starter · #20 ·
Bill's valve body is a good starting point to reinforce the tranny for now. Run it 'til it starts slipping (like stated, you'll notice 2-3 first most likely) and replace it - done. Keep your transfer case fluid changed every 3K miles if you race a lot, no real upgrades for it - it's actually already a pretty solid unit - chain will be the thing you'll replace, maybe main bearing, too. Skip at Demon Performance has great deals on WaveTracs right now...

Also, a transmission cooler never hurt, especially or the money - LINK.
Just bought the transmission cooler. Can't beat that price and if it helps I am all for it. Thanks again fellas appreciate the info.
 
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