Frank,
I heard that you were the guy to talk to if I needed to know anything about the 4L60. I have a problem with mine. Since I replaced the stock 3.23 gears with 3.73's, I will be going about 115 or so and it won't shift into 4th gear when I have it at WOT. If i let up on the gas it will shift into 4th though. It also cruizes in 4th. I was reading the description for a transgo shift kit for the 700R4 and it sounds like this is a popular problem. Do you know what I have to do to fix the problem? Thanks for the help.
Brandon

 

Sonnax "full throttle upshift" valve and sleeve.

Frank
CPT

 

Thanks for the help! So this would be something that I could do myself right? Do I just replace the valve body with the green cap on it in this picture? http://classictrucks.com/tech/0412cl_trans_10_z.jpg

 

look here...

 

Thanks, John. I hadn't got a chance to scan that yet. Yes, that's the correct part and part number.

Thanks,
Frank
CPT

 

As John has shown, this is the part you'll need. It's still a pretty easy install. You don't have to drop the valve body to do it. Just unbolt the TV linkasge (2 10MM bolts), and rotate it out of the way. Next, pry the roll pin out of the valve body casting with a pair of side cutters (dykes). Pull the original valve and sleeve out. You may need to pry it out, using the rings machined into the valve. It's OK if you damage it, because you won't be reusing it. Pull the spring out that's behind the valve, and use some vaseline to secure it into the new sleeve. It will rest on the inner valve (plunger). Make sure the roll pin groove (of the sleeve) is oriented properly before you push the new valve/sleeve assembly back into the valve body. Make a note of where the roll pin slot is located, so you'll know how far to push the sleeve into the valve body. Once it's in, install the original roll pin. The roll pin should only have slight resistance. If it's too hard going in, you probably don't have the sleeve oriented correctly. After you get the roll pin in, reattatch the linkage with the 2 10MM bolts. The roll pin will stick out of the valvebody about 1/8". The part sticking out will go in the slot of the linkage. There's a pin on the linkage will go in the hole in the valve body casting. After you tighten the 2 bolts, check to make sure the linkage moves freely. Throw on a new filter and pan gasket..fill it up with fluid, and try it out. It'll take approximately 5 quarts to fill it back up.
If you have a hard time finding the Sonnax part, I'll give you a phone number where you can order it from. Just PM me.

Frank
CPT

 

Thanks to both John and Frank. You have both been a great help.

 

Cool, can you relay that to my boss who thinks I should be working instead of "playing on the internet with that car crap"...

Really, no problem, glad I could help...

 

Why does it say that's it's not recommended for motors over 250 hp?

#20. 700R4 full throttle 3-4 up-shift sleeve. Now you can have a full throttle 3-4 shift. At 80 MPH it takes 90% throttle to make a 4-3 downshift. Can be installed without removing the valve body. The Up-shift Sleeve also eliminates part throttle 4-3 downshift for less gear searching. This is an extra option on the 700 Raptor. Not recommended for motors over 250 horse power. Cost $58.00

Here's the website I found it at: http://www.transmissioncenter.net/PinHole.htm

 

I have no idea what they mean with that statement. I've got them in 10 second 700's. I'm pretty sure they're pushing over 250 HP...LOL

Frank
CPT

 

I just found something a little weird after I installed this upshift sleeve. If i give it full throttle and leave it in drive it will shift into fourth gear at about 85 mph (4700 rpm). it won't do it if i keep the shifter in 3rd, but it will act like it wants to for a split second and lose a little rpm. Then it comes right back again. I just feel like that little bit when it seems to "think" about shifting but doesn't... i am losing a little bit of time down the quarter. Any experience with this? Oh and i know that a 700r4 can't "think"... that's just what it seems like to me.

 

Are you sure you're not feeling converter lock-up? You SHOULDN'T be capable of WOT lock-up, but something could be wrong that's causing it.

Frank
CPT

 

Well, I just got my tranny rebuilt at reputable place. they tested the converter and said that it was good to go. is it supposed to shift early like that when in drive? i almost want to take that sleeve back out of there and put the old one back in.

 

Some people dont like the FT4 valve because of the affect it has on Part throttle -4-3 kickdowns . But it in no way should have any affect in manual 3 or d it should only affect how the 3-4 up and downshift act in the OD position , Now as mentiond above there may be some issue with perhaps the lockup converter trying to come on but this would be unrelated to the valve in the D position.