My race build is wounded need help

[Gregg Nader]

I prefer running high energy in the o-run, but have not been able to find them new, only good used. I believe GM went across the board with HE then backed off and went back to paper in the non-shifting clutches to save money. I have devised a way to potentially get 50% more friction into the o-run, but this would require some expensive custom clutches and I have just not heard that many looking for it.

As for other stuff for the 4L60E, we have a lot, just check the performance section of the Sonnax website. All 4L60E parts are categorized into valve body, pump, servo, other/internal etc. making finding parts easier than before. More new stuff is on the way too. Notable parts are a Teflon rear stator bushing, input housing reinforcement sleeve and a billet aluminum forward piston.

Gregg

[sherlock9c1]

Gregg, what's wrong with the stamped steel forward piston set that you made a billet forward piston?

[ProTools4]

Originally Posted by Gregg Nader

I have devised a way to potentially get 50% more friction into the o-run, but this would require some expensive custom clutches and I have just not heard that many looking for it.

Ok drop it on me!

How about machining the parts so more stock type clutches fit.

[Gregg Nader]

Originally Posted by sherlock9c1

Gregg, what's wrong with the stamped steel forward piston set that you made a billet forward piston?

The Sonnax input housing reinforcement sleeve can only be used with an aluminum o-run piston. Aluminum o-run piston should only be used with aluminum forward, not stamped steel. OE aluminum forward breaks, thus our billet forward brings max durability.

Gregg

[Dustman.]

Originally Posted by Gregg Nader

The Sonnax input housing reinforcement sleeve can only be used with an aluminum o-run piston. Aluminum o-run piston should only be used with aluminum forward, not stamped steel. OE aluminum forward breaks, thus our billet forward brings max durability.

Gregg

I have actually used a steel forward piston with an aluminum overrun many times. You just have to know how to do it.

If the overrun comes on by itself it will blow the seal. But in practice that never happens :-)

I have done this probably 15 times all working well. Once again things that shouldent work do.


Tad, I would purchase a new sprag housing and install another BW dual cage sprag. THose units hold up in 800 hp cars and are very strong. You just have a fluke there.

When your racing you can keep it in drive if you want. THat will take a few PSI off the main line going to the 3/4 clutch but it wil keep the overruns on and will effectively support the sprag.

Get rid of the alto commercial clutches and go with the raybestos Blue plate frictions. The thin ones.

You can fit 10 in there with the thin steels and thin frictions. Dont let them get hot and they wont warp. Set clearance to .015.

[ProTools4]

Originally Posted by Dustman.

Get rid of the alto commercial clutches and go with the raybestos Blue plate frictions. The thin ones.

You can fit 10 in there with the thin steels and thin frictions. Dont let them get hot and they wont warp. Set clearance to .015.

I only use the commercials in the 3/4
the 3/4 a 9 pack.
Alto Reds for the forward apply and 2/4 band
everything else is BW high energy
many 12 second passes and many years and many miles later
I have never burnt a clutch pack up.
works for me.

I keep um tight run the vacmod that non one likes but me and I lightly score my steels.
again it works for me.

Originally Posted by Dustman.

I have actually used a steel forward piston with an aluminum overrun many times. You just have to know how to do it.

If the overrun comes on by itself it will blow the seal. But in practice that never happens :-)

I have done this probably 15 times all working well. Once again things that shouldent work do.

What is the benifit of the steel forward with alum piston?

Even broken the 1 and 2 work without the sprag.
works great.!
Drove home 140 miles like that....
Your saying the over run seal should have blown?

Originally Posted by Dustman.

I
Tad, I would purchase a new sprag housing and install another BW dual cage sprag. THose units hold up in 800 hp cars and are very strong. You just have a fluke there.

I think thats what I'll do.
Was considering TiGing the slip out of the sprag carrier....???

Originally Posted by Dustman.

When your racing you can keep it in drive if you want. THat will take a few PSI off the main line going to the 3/4 clutch but it wil keep the overruns on and will effectively support the sprag.

I use 1 & 2 in the burn out box
and Drive down the 1/4
...is that cool...

on the autocross I use 1 to leave the line
and 2 the 90% of the time
sometimes I will manual down to 1 then right back up to 2
so only 1 & 2
..that has always served me well..
no radical 4 upshifts with a nasty 4-2 or 4-1 down shift.
just lock it in and go.

The failure a fluke.
That sprag has hung in there a long time.
I leaned on it in OD being sporty on the street with new parts and it broke.
After many miles and combos infront and bein d the trans.

new 3500+stall edge, new 335 Kumho710 slicks, and custom Tri-Y long tubes w/ 3" exhaust and the sprag just didn't hang in there.
http://www.impalassforum.com/vBullet...d.php?t=232659




or it could be a fluke...

I did kill a Raybestos Mechanical diode / sprag at 290RWHP a long time ago.....???
Seems like that was post autocross on the freeway at 75MPH?

BTW have you ever got more than 2 frictions in the OVERRUN pack?

[sherlock9c1]

Why would you put more overrun clutches in? I know they will wear out quickly if you try to downshift without giving throttle, but is there a time you need this?

[ProTools4]

Originally Posted by sherlock9c1

Why would you put more overrun clutches in? I know they will wear out quickly if you try to downshift without giving throttle, but is there a time you need this?

see my autocross videos
this is a little hard on parts.

http://www.youtube.com/user/ProTools4

YouTube - Best Time 96' ImpalaSS slaying @...

[cobrienss]

So you're autocrossing in the stock seats? How do you manage to stay planted?

[ProTools4]

Originally Posted by cobrienss

So you're autocrossing in the stock seats? How do you manage to stay planted?

I just put in M5 Ricaros.

int that video
I have my left leg slamed in between the door and the seat!