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  1. #1
    Sr. Mechanic Ethan's Avatar
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    Sep 2009
    Location
    Cedar Park, TX
    Posts
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    Default 1994 Chevy tranny problems

    I'm kinda new here, so I'm not sure how all this works , but I'm going to go ahead explain my problem.
    I have a 1994 Chevy Silverado 1500 2wd with what I think is a 4L60E overdrive transmission. Its been giving me crap lately. Early in the mornings when its cold it will shift real hard and has a faster than normal crawl speed. And when it gets hot it will slip alot and does not like to shift out of 4th when you give it gas, which is annoying for going up hills, cause it just sucks more gas instead of just shifting to a lower gear. I've had the TPI( I think thats what its called) sensor replaced on my tranny. One more odd problem I have with it is that when I take off kinda fast, the transmission likes to sorta wind up, like it'll still goes, but after a certian point it feels like the gears fully catch and it kicks and acceraltes like it should.

    Anybody have any ideas whats wrong with my tranny? My auto teacher told me to just replace the tranny filter and fluid and put some Lucas tranny additive in it and it should fix it. But idk.

    Also, I've heard alot of bad things about this transmission, is it worth it to rebuild it, or just buy a new one? I've been looking for 5 speed automatics that will fit my 350.

    Thanks-Ethan
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  2. #2

    Default

    Quote Originally Posted by Ethan View Post
    I'm kinda new here, so I'm not sure how all this works , but I'm going to go ahead explain my problem.
    I have a 1994 Chevy Silverado 1500 2wd with what I think is a 4L60E overdrive transmission. Its been giving me crap lately. Early in the mornings when its cold it will shift real hard and has a faster than normal crawl speed. And when it gets hot it will slip alot and does not like to shift out of 4th when you give it gas, which is annoying for going up hills, cause it just sucks more gas instead of just shifting to a lower gear. I've had the TPI( I think thats what its called) sensor replaced on my tranny. One more odd problem I have with it is that when I take off kinda fast, the transmission likes to sorta wind up, like it'll still goes, but after a certian point it feels like the gears fully catch and it kicks and acceraltes like it should.

    Anybody have any ideas whats wrong with my tranny? My auto teacher told me to just replace the tranny filter and fluid and put some Lucas tranny additive in it and it should fix it. But idk.

    Also, I've heard alot of bad things about this transmission, is it worth it to rebuild it, or just buy a new one? I've been looking for 5 speed automatics that will fit my 350.

    Thanks-Ethan
    Hi Ethan,

    It sure sounds like your transmission has a code and is in failsafe mode. Failsafe causes harsh shifts and high line pressure. I'd suggest you take it to Autozone or a shop and have it scanned. Post up the codes and we'll help you fix it. How's the fluid look?

    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3
    Sr. Mechanic Ethan's Avatar
    Join Date
    Sep 2009
    Location
    Cedar Park, TX
    Posts
    150

    Default

    Quote Originally Posted by Jimmiee View Post
    Hi Ethan,

    It sure sounds like your transmission has a code and is in failsafe mode. Failsafe causes harsh shifts and high line pressure. I'd suggest you take it to Autozone or a shop and have it scanned. Post up the codes and we'll help you fix it. How's the fluid look?
    Really? I didnt know transmissions could have code, at least on older model cars. I havent checked the fluid in a while, but I havent done over 40,000 miles yet since it was changed. I'll look at the fluid tomorrow and let you know. I dont know how a shop is going to tell me what wrong since its OB1 and I've been told that the computer diagositc stuff dosent work on OB 1.

    Also, when that TPI sensor when out, it was shifting like I was flooring it when I was actually just doing 30 miles an hour. What I'm talking about is nothing like that, its very unknoticable but it still affects my 0-60 time and my shifting problems when crusing around.

    But thanks for replying.
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  4. #4

    Default

    Really! You have a 4L60E transmission and although it's OBDI it still has 4 solenoids and is completely controlled by your PCM.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  5. #5
    Sr. Mechanic Ethan's Avatar
    Join Date
    Sep 2009
    Location
    Cedar Park, TX
    Posts
    150

    Default

    Quote Originally Posted by Jimmiee View Post
    Really! You have a 4L60E transmission and although it's OBDI it still has 4 solenoids and is completely controlled by your PCM.
    Learn something new every day, so my transmission is controlled by a computer? I thought automatic trannys worked on fluid pressure? Or is that the older automatics? Idk, I'm going to be takeing a automatic transmission class next semester, so I guess I'll know alot about them then.

    But I'm about to go and take a bunch of pictures of my truck here in a little bit, so I'll post a picture of the tranny and the fluid color.

    Also, does autozone do a scan for codes for free? I'm a bit tight on money. I'm hopeing my auto electric teacher might have a fancy tool for checking for codes on a OBD 1 truck.
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  6. #6
    Sr. Mechanic Ethan's Avatar
    Join Date
    Sep 2009
    Location
    Cedar Park, TX
    Posts
    150

    Default

    This is the best picture I could get of the tranny, it was raining outside.




    And this is the color of the trans fluid. To me it still looks very good.

    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  7. #7

    Default

    Your fluid looks OK. Auto Zone will scan it for you for free!
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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