No 3(D) or 4(OD) after a loud thump in transmission

Reply Subscribe

Thread Tools

Search this Thread

10-14-2013, 06:43 PM

NewOrleansLT1

11 Second Club

Thread Starter

Join Date: Jan 2010

Location: New Orleans, LA

Posts: 1,707

Likes: 198

Received 13 Likes on 9 Posts

No 3(D) or 4(OD) after a loud thump in transmission

After normal driving the car shifted into 2nd then 3rd then I felt a thump in the transmission and 3rd and 4th went completely out! R,1,and 2 works fine. Any help is appreciated thanks.. 1994 Z28 4l60e

Reply Like

10-15-2013, 05:56 AM

FirstYrLS1Z

TECH Veteran

iTrader: (4)

Join Date: Aug 2004

Location: Euclid,Ohio

Posts: 4,154

Likes: 1

Received 129 Likes on 114 Posts

sounds like forward sprag broke. you should be able to upshift to/thru all the gears by starting in 1st.

Reply Like

10-15-2013, 10:47 AM

mrvedit

Moderator

Join Date: Aug 2010

Location: Ann Arbor, MI

Posts: 7,053

Likes: 46

Received 388 Likes on 297 Posts

Quote:

Originally Posted by FirstYrLS1Z

sounds like forward sprag broke. you should be able to upshift to/thru all the gears by starting in 1st.

That is a very likely diagnosis. You are therefore running on just the overrun clutches which don't have a lot of holding power - i.e. easy on the throttle until the trans gets fixed.