v8pwr

iTrader: (19)

I have an LS1 t56 and would like to know @ what rpm are you reliably shifting . I really want to build the SSR hybrid that 85MikeTPI documented but I have other needs . I'd really like to build my 402 to make power past 7500 and shift around 7000 - 7200 . Please let me know how & what you're doing . I know the triple synchro setup can do this but that costs more money .

BarneyMobile

iTrader: (4)

As long as your syncros are healthy and your clutch syetem is working properly, 7k+ shift shouldn't be too much of an issue. I've made tons of 7k shifts.

thesource

iTrader: (60)

I'd go face plated if you plan on shifting that high on a regular basis.

v8pwr

iTrader: (19)

I won't do this all the time . This is just your typical LS build but I love the rpms . The car will be driven mostly on the street with an occasional trip to the track . I might add some spray later but that's a maybe .

1sick-Z

iTrader: (3)

I have been shifting my t56 at 7300 for a coupe years now. It is nowhere near stock F body but when it was I was doing the same thing. I dont think RPM is the killer. At least not for what you and I do. If you were planning on revving 8500+ I would say you might want to talk to somebody else.

Hard launches and missing shifts is what will kill it fast.

Cheeks

iTrader: (1)

I shifted my 408/t56 combo at 7200 for quite awhile without issue, t56 was built by tdp tranmissions in texas

jmm98LS1

iTrader: (28)

7200-7400rpm flat-foot shifts here and it's still alive *knocks on wood*

BES Stroked Nova

iTrader: (24)

I ran a stick shift only class all last year, and won the points series, cant say for sure how many passes, but my guess would be over 100, and that was just last year, trans is 3 years old now.

My shift light for UMTR/bracket is 7500. I have flat foot shifted it 7900 30 or so times searching for that 10second on motor pass. Many and many high 1.4 60fts, but has been 1.44 60ft 3800lbs

Trans was a Stage 4 done by Six Speeds Inc before they went, has one of the first Tick masters made, DFX clutch, GM slave. Hurst billet plus shifter.

v8pwr

iTrader: (19)

Thanks everyone for their input , I really appreciate it . Now I just need to choose a rearend ratio .

slowride

iTrader: (3)

Make sure the clutch is releasing and use something with a light clutch disk.

wrd1972

iTrader: (12)

Yup disk weight plays a big role in how well and fast shifting takes place.

norcalauto

iTrader: (2)

Would pressure plate weight also play a role?

I had a RAM910 single disc clutch with a Fidanza flywheel behind a freshly rebuilt T56 with basic upgrades and a 440rwhp heads/cam LS1 and shifted at 7000rpm foot to the floor shifting at least 50 times. Lots of standard fast shifting with no ill effects. Car was only 2800lbs wet

v8pwr

iTrader: (19)

I never see clutch disc weights published . What clutches are you guys running ? I'd really like to see what works very well with my intentions , a street car with a 402 that can be daily driven & beat on the track in the same night without worry .

SMOKNSS

iTrader: (3)

I dont have a 402 but with my set up and all the nitrous ran through it I should be making more power than you. I have a STG 3+ SPEC and I shift on the floor at 7200-7300 rpm and some pretty decent lauches on the street. Went a best 60' of 1.64 on a 325 radial, one of the few times I went to the track. My six speed wasnt anything fancy, it had a few upgrades but it would probably be equal to a Tick level 2 build. Then again, thats probably why its in the floor now. LOL!!!

v8pwr

iTrader: (19)

How did the rest of the run go ? What gear do you have in your rear ? Were you spraying out of the hole ? My T56 is anything fancy either . It's a fresh rebuild with new bearings, synchros, 3-4 fork, billet keys, & bronze fork pads . I'm not an abusive driver or going to compete in any competition .

85MikeTPI

iTrader: (9)

Just remember that you can use a GTO 27-spline mainshaft and MM6 triple synchros from a C5 and make a much lower cost hybrid high-rpm T56 over the 32-spline hybrid.

If you're making peak power past 7500rpm, you don't want to shift at 7000-7200..

v8pwr

iTrader: (19)

I know I can use the GTO shaft thanks to your informative threads . The cost of either is what pushes me away . The shaft is a minimal cost . The donor C5 t56 is more money . The rebuild kits for the triple synchro t56's are expensive . I was not aware of the benefits of the triple synchro t56s till after I had mine rebuilt . Now I want to finish my build and make the most power I can with what I have . I need my v8 .

wrd1972

iTrader: (12)

Weight of the pressure plate plays the opposite role compared to the weight of the disk.

My stock LT1 disk weighed in at 5 pounds and my old Spec 3+ weighed in at a hefty 7.5 pounds. Shifts were slower and required more effort at the shifter because the blocker rings require more force to sync up the speed of the gears with the heavier Spec 3+ disk. Its that inertia thing simply put.