help me diagnose auto tranny problem
help me diagnose auto tranny problem ok to start, ive only ever worked on manuals so this is all forgein to me. my younger brother called me tonight and said he thinks his tranny took a crap. he has a 2001 GMC Sierra C3 with a 6.0. the truck has 91K all stock. well he said he pulled up to a stop sign and then wanted to back up...no reverse. he said it will go forward ( drove it 10 miles home) but it was making a whining noise all the way home. he checked the fluid and it read fine (cold). what are some things to look for when going to check this truck out. if he needs another tranny will any 4L60E work? or would it be better to get a truck trans? assuming it has the 4L60E.
Closed ex-Sponsor Account
Joined: Dec 2008
Posts: 434
Likes: 0
From: Az
ok to start, ive only ever worked on manuals so this is all forgein to me. my younger brother called me tonight and said he thinks his tranny took a crap. he has a 2001 GMC Sierra C3 with a 6.0. the truck has 91K all stock. well he said he pulled up to a stop sign and then wanted to back up...no reverse. he said it will go forward ( drove it 10 miles home) but it was making a whining noise all the way home. he checked the fluid and it read fine (cold). what are some things to look for when going to check this truck out. if he needs another tranny will any 4L60E work? or would it be better to get a truck trans? assuming it has the 4L60E.
When he drove it home, did it act like it shifted into 2nd gear at around 30mph or so? Did it seem to only have 2 gears, 1rst and a late 2nd? It is possible Reverse Drum, sun shell stripped or broke, No 2nd, 4th , reverse. Or planetary is bad. Both can cause whining and no reverse. Rebuild original.
Trending Topics
im goin with the reverse band or sun shell its not totally toast though these parts can be replaced but not for cheap as the trans needs to be totally disassembled to do so, and just about any 4l60E will work but they are all a bit diff depending onthe model just make sure you get a four wheel drive trans if its a 4wd as they are shorter than the 2wd trans, also you hafta check the fluid at operating temp always not cold, i cant guarantee anything cuz there are 700 parts inside this trans but i know it can be fixed its not totally junk
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
