Mavn

iTrader: (3)

Hd-2 Trans won't shift from 2-3 at wot anymore.. Did I blow my clutch packs?

murphinator

iTrader: (2)

captain obvious here but did you check fluid level ? sometimes slightly overfilling will help the 2-3 shift especially if your manually shifting it , so if it is low at all it could be your issue.

mrvedit

Since the most common complaint here is a blown 3/4 clutch, your conclusion is probably right. The symptoms start by hitting the rev limiter when attempting the 2-3 shift at WOT, and typically get worse until even moderate throttle is slipping in 3rd gear.

Drj8787

Do a fluid n filter change don't flush it tho. I was having same problem and a fluid n filter change fixed it. Not saying that wouldn't be the clutches but when was the last time it had a fluid n filter done. I suggest to do this first before deciding that the tranny needs parts. One other thing is are u in D or OD when this happens? Mine would only do it in D and made the shift fine in OD good luck

hrcslam

3/4 clutch pack worn very likely. Is it under warranty?

murphinator

iTrader: (2)

seen this posted many times also that there is more pressure applied regardless of gear your physically in when shifter is in od , forget the mechanical reason but there is one lol , less chance for slippage if left in od

mrvedit

Yes, with a stock(ish) trans, keep it in OD. Otherwise during the 2-3 shift both the 3-4 clutch and overrun clutch are engaging at the same time, robbing the 3-4 clutch of pressure.

The special Sonnax HD 2-3 shift valve improves shifting in[D3] but is a non-trivial install. More info here:
https://ls1tech.com/forums/automatic...ure-flare.html

Drj8787

So just to add a bit n see what others do. I launch in D after it make the 1-2 shift I bump it to OD so it will make the 2-3 shift then I drop it back in D so it won't come out of 3rd before the end off the track. If I launch in OD it shifts out early. What do you guys do. My trans is stock with pressure bumped up and shift point adj. stock converter. i run a 1.9 60' 12.92@106.69 it now has a 3600 northtexasconverters single disk billet now haven't been back to track since. Sry to hijack but mine does/did same thing new verter fluid n filter now seems to shift right on street at least.