Anoither tranny question

Mike in Mn. · Oct 24, 2011

Kid just bought a 93 half ton chev 4x4 from a neighbor farmer, high miles, was his Sunday go to church truck and his wife drove it to work, not a scratch on it!! But 228000 miles. It has no high gear, fluid looks and smells good, ist, 2nd, and reverse work great, when it hits 3rd motor just winds up, nothing at all. I think the kid said it's a 4L60E auto. I never got into anything newer than a 7004R, any ideas?? Thanks for your help.

Revredneck · Oct 24, 2011

If it disconnects when it shifts to 3rd, then you've got something broken in there. You will probably be money ahead to swap out a fully remanufactured unit instead of trying to repair yours. If you can do the work yourself, do a Google search on the 4L60E and you'll find lots of options. In any case, it sounds like the truck is worth fixing.
Good Luck and God Bless

Brian Jasper co. Ia · Oct 24, 2011

Does it have to be in low 1 or low 2 to move? Put it in drive and nothing? If so, sounds like the forward sprag is out.

Bob · Oct 24, 2011

Scan for trouble codes.

luv2wrench · Oct 24, 2011

The 3-4 Clutch Pack is burnt (failed). Most common failure. 3rd and 4th share the same clutch pack, the 2-4 band comes on in 4th to hold the reverse input drum to hold the sun gear to get overdrive. The 4L60E is the same basicly as the 700 but just electronic with pressure control solenoid controlling the line pressure and not a cable and throttle valve. Pull trans and over haul. Set clutch pack clearence to .030 to .040 for 3-4 clutch pack. I build these everday in a GM shop. replace the coverter and the pressure control solenoid. any other questions just ask.

luv2wrench · Oct 24, 2011

best bet is a reman. Thats what i recommend to the do it yourselfer that can atleast pull it and replace it. trust me. Lotta special tools for seal sizers and such. reman has a better warranty than you doing it yourself.

Brokenwrench · Oct 24, 2011

My guess is burnt out 3/4 clutches. When the 3/4"s give up, thats what you get, neutraling out on the 2-3 shift.

If you were missing first and fourth then you could be electrical(bad shift solenoid).

Like Brian said also, could be a blown sprag if you have to manually pull it into 1st or 2nd to initially take off. Either way, it sounds internal to me..

Allan in NE · Oct 24, 2011

Why in the world would ya replace the converter and the step motor?

Yeah, I spent a couple of lifetimes under those rascals too.

Allan

Allan in NE · Oct 24, 2011

With 228,000 miles, changes are that's not the original transmission, but I guess stranger things have happened. :>)

Does it actually try to shift? As in second just drops out and you have nothing but neutral? If so, these other fellas are right; 3/4 clutch.

BUT, if it doesn't even TRY to shift and just stays in 2nd, check that fuel filter. Could be that's all that is wrong with it.

Allan

luv2wrench · Oct 24, 2011

Why wouldn't you? I pull i build these in 7 hours flat. This guy gunna have alot more time in it then that. MTS in Omaha sells these converters for 120.00 bucks. cheap insurance for him. At the shop here (GM Dealer) i RARELY replace converters cuz i m overhaulin units with less then 100k on them. some only have 10k on them. And GM doesnt want 600.00 converters throw at every overhaul. At 228000, its time.

As far as the Pressure control solenoid goes, when you have a clutch failure that solenoid acts like a magnet and collects all the faris meterial and can affect line pressure. Again, just CYA for him. His best bet is to buy a Cerified Transmission replacment.

Mike in Mn. · Oct 24, 2011

Thanks everyone for your input, looks like it will have to come apart, I was thinking maybe a solenoid or something easy. Neighbor bought it new and it's the original trans. In drive it shifts 1-2 real nice and 2-3 just like you bumped it to neutral, reverse is also right there. It's a nice truck and he only paid $350 for it. I have a wholesale place in the Twin Cities to get parts, so another project for this winter, thanks again!!

Mike in Mn. · Oct 24, 2011

I have fixed a lot of them with a fuel filter also!!! But not this one.

Mike in Mn. · Oct 24, 2011

Thanks for your input, that's what I needed to hear, I'll get a manual and go through it.

Allan in NE · Oct 25, 2011

Okay,

It's "soot" time, looks like. What's nice about those old sisters is that ya can "repair" 'em in one heck of a hurry if you know the fault.

I don't even take the valve body off; just yank the guts right out the top, throw in the seals and plates and back into the rig again she goes. :>)

Hardest part is "bending" that silly transfer case down outta there. :>(

Allan

Allan in NE · Oct 25, 2011

Well yeah,

If ya don't know the history on the outfit.

But ya gotta admit, 18 years on a set of GM seals is really pushin' it to the limit. Especially up there in his country.

Ya just KNOW it's been rebuilt at least once. :>)

Allan

Hobo,NC · Oct 25, 2011

(quoted from post at 12:32:48 10/25/11) Okay,

It's "soot" time, looks like. What's nice about those old sisters is that ya can "repair" 'em in one heck of a hurry if you know the fault.

I don't even take the valve body off; just yank the guts right out the top, throw in the seals and plates and back into the rig again she goes. :&gt

Hardest part is "bending" that silly transfer case down outta there. :>(

Allan

I Take it all out as one unit.. I have worn out several homemade tools removing the torsion bars,, about a year ago I brought the OTC special tool to remove the torsion bars,,, since then I have not had to do one,,, that's how it goes you tool up and never see one again...

John_PA · Oct 25, 2011

(quoted from post at 12:39:57 10/24/11) The 3-4 Clutch Pack is burnt (failed). Most common failure. 3rd and 4th share the same clutch pack, the 2-4 band comes on in 4th to hold the reverse input drum to hold the sun gear to get overdrive. The 4L60E is the same basicly as the 700 but just electronic with pressure control solenoid controlling the line pressure and not a cable and throttle valve. Pull trans and over haul. Set clutch pack clearence to .030 to .040 for 3-4 clutch pack. I build these everday in a GM shop. replace the coverter and the pressure control solenoid. any other questions just ask.

What he said, and just to add... You might want to pull the pan and check the magnet. if it does come out clean, and fluid is clean... disconnect the battery. wait 15 minutes, reconnect, then try again. chances are it won't work, but worth a try. I have had a dirty electrical connection after a complete rebuild on one of those. I am a ford guy, so I don't know much about them, except for 3 700r4 rebuilds I did. The last 4L60E I played with just had a dirty plug. someone replaced the transfer case, disconnected all the plugs, and got dirt in them putting back together. It was rare, but, it happened.

Allan in NE · Oct 25, 2011

Hey Pard,

Ya really don't have to go thru all that.

6 bolts holding the transfer case to the transmission adaptor and that case will tip right down out of there nose first.

Allan

Anoither tranny question

Mike in Mn.

Member

Revredneck

Member

Brian Jasper co. Ia

Well-known Member

Bob

Well-known Member

luv2wrench

Member

luv2wrench

Member

Brokenwrench

Member

Allan in NE

Well-known Member

Allan in NE

Well-known Member

luv2wrench

Member

Mike in Mn.

Member

Mike in Mn.

Member

Mike in Mn.

Member

Allan in NE

Well-known Member

Allan in NE

Well-known Member

Hobo,NC

Well-known Member

John_PA

Well-known Member

Allan in NE

Well-known Member

Similar threads