Someone told me that 6600rpm shifts would be bad for these??

Anyone know?

 

Did they give a reason? It'd be no different from the 4 pinion planets going 6600 RPM, other than the increased mass..

 

In some article I read, the 5-pinion was described as
being for trucks and lower-RPM applications. Not sure
why, no real details given. Maybe the same shell, more
gear mass makes more stress at RPM.

 

The 4-pinion reaction carrier found in the Y-car (and presumably F-car) has high speed lubrication for the pinions. There's an oil deflector and hollow pinion pins that allow them to be cooled/lubricated at high speeds. This is mostly for sustained high-speeds (Autobahn) and not for high-RPM shifts, though it probably helps a little for the shifts too.

The 5-pinion model has no such provisions, but wouldn't that be the best of both worlds (high speed AND high trq capacity)?

 

If that's true then a properly cooled transmission would better benifit from the 5-pinion due to it's strength advantage? -- This is what I thought.

The info came from a very well known sponsor but if he's wrong I don't want him to look bad. This person implied that the 5-pinions were a bad at that rpm due to the weight of the planetary.

I sent him another e-mail asking him to elaborate on it.

 

I had read where it was implied that the 5s weren't good for high RPMs. I was ordering parts from TCI for mine so I asked Kevin Steele about it. He said he didn't see any reason that the 5 would have a problem with high RPM shifts. I'll take the extra stength unless I see some good info showing that the 5s aren't good for what I'm doing. I've destroyed hard parts before.

 

Well, I agree that the 5-pinion is the way to go for most applications. But being properly cooled on a system level won't necessarily reduce temperature by a lot right at the pinions. You need the hollow pins to really cool them properly. Basically, the 5-pinions' increased torque capacity outweighs the high-speed cooling benefits of the 4-pinions in most situations.

I don't think the weight is really the issue. The extra pinion/pin mass is nominal and it fits into a carrier with the same overall dimensions as the 4-pinion carrier. The dynamics hurt my head , but I think the weight of that extra pinion doesn't change the inertia of the carrier itself for stop/start shift events.

 

Well I've broke two aftermarket 5-pinion planetaries and now getting read to try the new 4l65e plantearies. What I've read the OEM 4 pinions are stronger than the aftermarket 5 pinions and the 4l65e ones are 25% stronger than the OEM 4-pinion.

Hope it holds together this time

 

So there are aftermarket 5s that are supposed to be weaker than OEM 4s and there are OEM 5s that are supposed to stronger than OEM 4s?

Wonder which I have...

 

I just checked mine. It's from TCI, it's in a TCI box, but I don't know if it's actually made by TCI, someone else, or if it's a repacked OEM unit. Hey Kevin Steele, what about it?

I wouldn't think TCI would sell it if it were WEAKER than stock. In fact, Kevin made it real clear to me that this was a stronger part than stock. He tends to know what he's talking about, IMO.

 

I have mine going to 6800 and no troubles. Ofcourse It seems I have broken every part in the tranny besides the planetary.

 

Without a doubt. The 5-pinion reaction carrier you're looking for is GM part #24218069. Depending on which distributor you get it from, expect to pay $200 to $260. Anything else, well you get what you pay for.

 

What TCI sells now are 4l65e planetaries. I dunno when these parts became available to the market but I know it was sometime early this year.

My tranny was initially built about 1yr 3-4 months ago and installed about 1 year ago. When it was built I know for a fact there wasn't any 4l65E parts available at the time because I asked the builder when I had no clue about trannies if there was anything better than a 4l60e like a 4l70 I had heard about (yank's tenative name) I was then told that almost every part in the tranny was going to be aftermarket due to the fact nothing OEM that was upgrade was available.

If memory serves me right Sunnex(SP?) makes aftermarket planetaries. I can't find their freakin website to confirm it and I've heard you have to be a member of ATSG just to buy parts direct from them.

I paid 2100+ dollars for my tranny and it's blown twice on street use. This last build had 10k miles on it 3 visits to the dyno and 1 visit to the track where I did not do a burnout.

What's funny is this same identical build tranny took over 60 dyno runs at 650rwhp/700rwtq -- made 5 or so 6.40 1/8th mile passes and 1 quarter mile pass. Then the output shaft broke, they put in one that was cryo'd the engine blew, the tranny was sold to someone else that runs <7.50 in the 1/8th that goes several times a week and puts a hella miles on it and that tranny has no problems...

Mine on the other hand has had problems since 1200miles

...But then again that first tranny was built special for Speedtek and they partly based their decision on whether or not to due business with them on whether or not the tranny held up to the power.

For the record the builder is TEXAS BEST TRANSMISSION, Arlington, TX

The tranny was purchased via Speedtek but it is not their build, Speedtek is currently doing everything they can to help me out in my situation.

 

Yes, Colonel, you have a 4L65E rear and front planet. Yes, the rear planet from some companies are cheap after market parts. So, watch what and who you buy from. You can not get a front 5 pin planet after market, yet.

Kevin Steele
Product Engineer
TCI Automotive

 

I found out why this person said that they were bad at that rpm, apprarently GM only rates the 4l60e to 6100rpms and the 4l65e to 5600rpm -- that's where the basis of his statement came from

http://www.gm.com/automotive/gmpower.../apps/4l60.htm

Colonel what kind of shifts to do you see and what kind of power have you had a 4l60e operating with out of curiousity?

Kevin Steel do you think I'd be okay with them in my tranny? Gonna put a procharger on eventually or I might spray a 125 shot on what I have.

 

I've pushed about 525 RWHP through a 4L60-E. I ran 10.03 at about 136 MPH. I shifted as high as 7200 but usually 6800 or so. That tranny got rebuilt OFTEN!