I have 4l60e tranny and it wont go into 4th. i hooked up the HP tuners to it and tried shifting it through the computer and it wont go. when I leave it in drive, it feels like it wants to engage but wont grab.. Any ideas?

 

"01 Silverado 4.8L single cab 2wd
AEM Brute Force Intake, Power Throttle Bodies 85mm Throttle body, Custom Cam, 918 Sprins, Chromoly 7.4 Rush Rods,ASP Underdrive Pulley, Twin Zirgo 16" Elec. Fans, JBA Shorty Headers, 3" Flowmaster Catback,3200 stall, Shift technologies 2nd and 4th gear servos, HD2 shift kit, Richmond 4:10 gears, Street Tune, And Motor Juice."

Sounds like there isn't a 4th anymore.

 

Sounds like your trans is on the way out. Are you getting any codes? Feel free to give us a call next week to discuss your situation. And just a heads up we are running a free shipping special. Vince

 

im haveing the same problem after a rebuild....i had 4th one day....(after about 90 miles have been put on it) then went to go drive it saturday and no 4th...just stays in 3rd......
would it be a linkage problem? or the modual on the driver side of the the tranny?

im lost! and about to put a rock on the gas pedel and send it on the 1" thick ice we have and see how far out it will go! before she sinks!

 

No codes but it feels like its going to engage but it slips back into 3rd

 

yeah dude smoked ur trans. U wont get a code when u lose a gear in ur trans. I've smoked clutch packs in 2 different trans (well the 1st we know was clutch packs I think the latest 1 was 1st was fucked..) anyway... u wont get a code. U need a trans man.. sorry to bear the bad news

 

true no code i think it might throw a tanny slipping code but rare. yup ur tranny gone i have no 2nd it goes from 1st to 3rd. im just saving up for a flt level 5 hehe

 

SHIIIIIIIIIIT!!!!!!! What you think of a 4L80E upgrade?

 

I'd just buy a stage 5 60E from FLT.

 

Stock 80E is definitely stronger than a 60E in the same form. As for the difference b/t a built 60E vs a built 80E, I'm not sure you need that much trans. PT has two sponsors that build strong units. I (personally) know of a few FLT L5 units that have withstood a BUTTLOAD of punishment, and are still going strong.

If you're experiencing slippage from 3rd to 4th, then there's a good chance you're not seeing 2nd (I don't remember what you described). With that, you're looking more towards 2-4 band wear. The reverse input drum may also have slight grooves (will cause a new band to wear irregularly). I ""would" say clutch packs, but you still have 3rd. Call up Vince @ FLT, or maybe Performabuilt. They can help you diagnose a bit further. If you call Vince (or Chuck) at FLT, you'll get great customer service (trust me, I know).

^^ not that I don't like Performabuilt... just my personal experience.