A proshifted transmission *CAN be downshifted, do not hold the opinion that they cannot. I personally have a Liberty Pro Shifted Tremec TKO in my street/ strip car. Obviously you know the story when powershifting a proshifted transmission. It's like butter. You can also drive one normal on the street with alittle more care when upshifting (under normal throttle conditions). You can also *downshift easily in any gear by pressing in the clutch, throwing the transmission in neutral, revving the motor (my example is to around 3200rpms) to get the transmission to match the drivetrain speed and then slowley pull it back or forward into the gear you need. BTW, you can retain 5th gear as a syncho'd gear for highway / crusing use such as I did.4" Stroke said:Thanks guys.
I was running a 3550 Tremec behind my 408 making 450 rwhp and 100 shot of NOS. I was able to go 10.50's on slicks and 10.90's on radials. I was going to switch to and automatic, but I don't want to give up the 5 speed. I won't run one with that is proshifted, because I want to be able to down shift. So what is a TKO +?? I need something that will support high to mid 9's with the new combonation going in.
:joy:twinturbosaleen said:proshifting does nothing to increase the tranys strength though
"it only makes it easier on the trany when shifting and makes shifts faster."
- I have to disagree, although you have valid reasons for the ahnilation of your tranny. Here goes.
With the synchronizers in the tranny you are allowing a very small rotating part to mesh with another, under such a load during extreme conditions (powershifting, good horsepower, etc) these teeth read*synchros are put under alot of stress *DURING the shift, so indeed the tranny by "proshifting" is made stronger thus the "open window of opportunity to make the shift, read*powershifting" occurres quicker and with more precision. . .
Easier on the tranny, and it should also be mentioned the "Dog rings / teeth" on a proshifted gear are stronger than the synchros.
"my car had a tko in it and im fairly sure its the highest horsepower car i know of that had one."
Ok, good job, shame on your for having a transmission not suiteable for the job.
"at 3550 pounds i made 863 rear wheel horses and 949 rear wheel torque the transmission lasted exactly 3 ful throttle blasts before i RIPPED all the teeth off third gear .."
again, good job on the hp/ tq numbers, although I'm not impressed with your application of a tko behind such figures. The *total strength of the tranny (input, output shafts, gearsets etc) are based into a total rating, obviously before you even started your car, you should have been aware of such.
"and not on a shift i simply rolled on the gass at 80 miles an hour in third and it riped all the teeth off when the boost came up."
When a transmission is proshifted dependant upon who does it, a stronger gear is used which might have delayed your results..
again, stronger. and shame on you again.
"I did however run the car at lower boost makeing 650 rear wheel horses and 700 rear wheel torque without issue for a while."
must be a good clutch in the car then.
"I would say the tko is good for around 650 flywheel torque honestly for sustained life."
"btw the tko + is no stronger on 1-4 that i have seen.. it simply has a diferent overdrive ratio for road raceing."
The TKO has a different spline count on the input and output making it stronger, I also believe although it might be in the TKO II specs, that the gear sets *WERE improved in overall handeling strength..
knew you had a beefy clutch in there somewhere.twinturbosaleen said:I have never in my life seen a syncroniser break.. they just wear and then the shifting becomes notchy.
when they proshift transmissions i seriously doubt you will find a stronger gear then the heat treated 4340 high nickle content steel the tko gears are already made of.
as for my clutch its a dual disc mcloud wich can hold 1200 foot pounds of torque no problem.. the same clutch that is recomended for use with liberty or gforce transmissions for 1000 plus horse use on the street.
as for tko2
all the tkos now come with the same gears in them for 1-4.. all of them, they were not improved stength wise.. the diference is the cluster has replaceable indivudal pressed on gears instead of haveing a one piece cluster so its easier to service individual gear failures.
i personaly hate proshifted transmissions.. I just do not think the 1 tenth i may gain in et is not worth the sacrifice in street ability.
I have NEVER in 5 years of haveing a tremec then a tko in my car missed a gear .. So its not much of a issue for me.
my trany lasted for a long time in the car when it was a ten second car at 3500 pounds non proshifted.
when iturned the wick way up i simple over powered it.
And as of yet, there is no SFI approved scattershield for the T-56's. Mcleod says they'll have one out over the summer however, we'll see.twinturbosaleen said:the tko is every bit at strong AND STRONGER then all t-56 tranys except the viper spec but it cost a good 1200 more to do a viper spec then a tko
and to be honest .. i think the viper spec is only slightly stronger.. and it has that HORRIBLE 2.66 first gear ratio
at the power level you are talking about a tko will be plenty.
I'm needing a good manual tranny for my project, how do I get in touch?NITROSTANGRACING said:Just a little bit of additional info. The company I work for builds TKO's with 3rd gear upgrades. So far we have gone as fast as 10.14 in Brian Meyers Real Street Car. What we do to strengthen the unit is to remove the 3rd gear cluster. Install a high nickle 3rd gear, hardened keys below the gear and weld the complete cluster assembly. Like origionally stated you can drive a pro shifted unit on the street you just need to take care of it. We also can do a STREET pro shift where only every other tooth is ground away. Obviously it gives you the performance capacity of regular Pro Shifting but it aslo gives you more strretability. Pay attention to the NMRA results from Reynolds. We are hoping to have the first 9.00 second real street run in history.