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Old 04-17-2006, 08:04 AM
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Stick with the 6 speed or go automatic?

So I went to the track this weekend with my small block 68 camaro. Car has a T56 trans, 5.00 gears, M/T ET Street Radials. Motor is about 500-550 hp before the nitrous, supposed to be (Desktop Dyno) 550 ft lb before the nitrous (only a 125 ****).

I know that my trans is only "rated" for like 400ft-lb. I have ran this car hard before, but this time, after my third run (no nitrous) it became stuck in 4th gear and now I have a little trouble shifting OUT of fourth gear - still goes into fourth great. Some have said that this is synchro damage.

I have over $2000 in the trans, clutch and flywheel. Replacement parts are high and the trans is involved to fix (I hear).

So, do I bite the bullet and get a 200 or 700r4? Car would probably launch better anyway. I just don't know if this thing will hold up in the long run. ANyone have any gut feelings? The car is a street car with some play time at the track for fun.

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Old 04-17-2006, 08:49 AM
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Quote:
Originally Posted by hotrodf1
So I went to the track this weekend with my small block 68 camaro. Car has a T56 trans, 5.00 gears, M/T ET Street Radials. Motor is about 500-550 hp before the nitrous, supposed to be (Desktop Dyno) 550 ft lb before the nitrous (only a 125 ****).

So, do I bite the bullet and get a 200 or 700r4? Car would probably launch better anyway. I just don't know if this thing will hold up in the long run. ANyone have any gut feelings? The car is a street car with some play time at the track for fun.
I would suggest going with the old tried and true TH400 (well built) you are running a good amount of HP and torque through it, also with the ET streets, they will put a lot of strain on the rear end and the trans.

Steve
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Old 04-17-2006, 11:19 AM
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I do have a fresh TH350, but only 3 three speeds will spell the end of my cruising days. Without OD, I just don't see the point. Guess I want to have my cake and eat it too. After all, what good is cake if you can't eat it!

I have a 700R4 behind a 355 with about 400 HP or so, and it does great. Course it has the Kolene and Kevlar goods in it.
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Old 04-17-2006, 08:09 PM
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700's or 4L80E

Want it all??? Go with a 4L80E (400 turbo with overdrive) You can do anything you want with it and you will not hurt it. As long as you have the good parts in it! We got one from JET performance and placed it behind a 572 BBC with laugh gas and this tranny is still working fine. I build Hi-po 700's and I am sold on this unit... If this isn't for you then look into a 4L65E from GM. Has 5 gear planets in it and doens't need anything done. Buy an aftermarket computer to make it shift and install it STOCK! It Works great...

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Old 04-17-2006, 09:01 PM
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Depending on how much you can spend, the T56 can be built to take your power levels. You most likely damaged the 3-4 shift fork. The GM T56 uses a stamped steel fork, while the viper T56 uses a cast aluminum one with much less flex.

All T56s are basically the same design but the viper unit uses a bigger mainshaft, longer input shaft, and larger 30t output shaft. The good news is that the inner guts can be upgraded to viper spec without changing your GM style external dimensions. That should get you to 500-550 rating. If you want more, switch to a straighter-cut gearset. Less side loading on the case means it can take more torque.

But, if you're planning on really hooking up with the pavement, it won't be long for this world. If you're just going with DOT radials, it might last just bogging it from the line.
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Old 04-19-2006, 06:36 AM
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Thanks for the info!

I started thinking about what you said about the 3-4 shift fork. Supposedly, this trans has an aftermarket steel fork in it - I was told that they were aluminum stock. Don't know how much truth there is in it.

I did drive the car last night with the stock shifter installed (instead of a cheap eBay B&M knockoff), and it still had the same problem, but to a lesser degree. I kept driving it for a little while, and the problem basically went away! I'm not sure what this means. Maybe the shift fork bent back the other way?

I was looking on eBay last night and I saw a couple things that interested me. One was solid billet synchro keys from RPM transmissions to replace the factory stamped steel units. Would this help me?

ANother thing I saw was bronze shift fork pads. I guess the stock ones are plastic and can get crushed and worn. Would these help at all or just extra money to spend for no good??

ANy more info or advice??
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