Tranny rebuild for 300-350 hp?

[streetdsmpwr]

I want to run a FP Big-28 eventually and I was wondering if I would need to rebuild my transmission for that. I have a stock 5-speed with redline gear oil.

 

[jrohner]

No, unless there is something wrong with your transmission you're fine. I'm pretty hard on my car, and I'm still running a stock transmission.

 

[evood69]

If its not broke dont fix it! . The stock transmission should hold up just fine if youre only wanting 300-350, even if you went 400-450 they are fairly reliable. Depends on how hard you drive it, launch alot, and other factors. But you should be fine.

 

[streetdsmpwr]

My budget thanks you.

 

[whe3ls]

you may need to look into getting a better clutch when your current one fails.

 

[pboglio]

An ACT 2600 or equivalent would help, but the stocker tranny will hold up fine, unless your me

 

[dsm-onster]

Slip the clutch more. It will save your center diff. Which will explode at even 300whp if abused. Slipping and preloading the drivetrain will take the shock away from teh center diff. If you at 350whp, Id say get a welded or 4 spidar no question, if you want reliability; even with proper lauching techniques employed.

And dont be like pboglio and do high power launches and hard 3rd gear pulls while the tranny is still cold

 

[toofast82]

Slip the clutch more. It will save your center diff. Which will explode at even 300whp if abused. Slipping and preloading the drivetrain will take the shock away from teh center diff.

Good advice

If you at 350whp, Id say get a welded or 4 spidar no question, if you want reliability; even with proper lauching techniques employed.

Yep, they are very susceptible to breakage at this level.
I'd probably consider getting an upgraded set of forks like the billet ones i've seen from JNZ and Magnus. That seems to be my achiles heel and I like the added piece of mind for the price. I broke 2 3/4s this summer

 

[JayRolla]

Good info by the wiseman. Its all about how you launch the car. You can destroy a diff on a stock car with an improper launch.

 

[streetdsmpwr]

Thanks for the info guys. I know this sounds stupid but I'm not sure if I have an ACT 2100 or 2600. I got the car last summer and the guy I bought it from (a mechanic) said he put in an ACT 2600, but it doesn't feel hard enough to be a 2600. I know its an ACT clutch, because he showed me pictures of him putting it in, but none of the box. He said it was a stage 1 clutch, which would most likely be the 2100. Is there a way of finding out without pulling the tranny? I don't have anything to compare it to.

 

[pboglio]

Pedal force usually will tell the tale, if all the geometry is stock. You have an ACT 2100 pressure plate for sure if you can't feel the diffference. The ACT 2600 is a little grabby bastard and requires some thought while letting out the clutch.
I started having problems slipping the 2100 when I upgraded to the EVOIII intake manifold, still on my T28. When it was cold out the ACT 2100 would slip like mad, this was my que to upgrade it. It couldn't handle the high rpm torque and would start to slip at high rpms. You will be fine for a long while I'd think.

 

[streetdsmpwr]

Thats what I thought. From all of the things I've heard about how much effort the 2600 takes it was hard to believe that mine was a 2600.