Chevy K1500 4L60E Transmission Rebuild - Revision history

Elijah at 17:06, 12 May 2020

2020-05-12T17:06:10Z

← Older revision		Revision as of 17:06, 12 May 2020
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	[[File:Transmission_removed.jpg\|600px\|Transmission after removal from the truck]]		[[File:Transmission_removed.jpg\|600px\|Transmission after removal from the truck]]

	Getting the transmission out is half the job! one of the exhaust ~~bolts~~ was stuck so hard it rounded off trying to remove it, I had to use a grinder to carefully cut the nut off the stud.		Getting the transmission out is half the job! one of the exhaust nuts was stuck so hard it rounded off trying to remove it, I had to use a grinder to carefully cut the nut off the stud.

	[[File:Xmission_torn_down1.jpg\|600px\|Torn down]]		[[File:Xmission_torn_down1.jpg\|600px\|Torn down]]

Elijah at 17:05, 12 May 2020

2020-05-12T17:05:44Z

← Older revision		Revision as of 17:05, 12 May 2020
Line 3:		Line 3:
	[[File:Transmission_removed.jpg\|600px\|Transmission after removal from the truck]]		[[File:Transmission_removed.jpg\|600px\|Transmission after removal from the truck]]

	Getting the transmission out is half the job!		Getting the transmission out is half the job! one of the exhaust bolts was stuck so hard it rounded off trying to remove it, I had to use a grinder to carefully cut the nut off the stud.

	[[File:Xmission_torn_down1.jpg\|600px\|Torn down]]		[[File:Xmission_torn_down1.jpg\|600px\|Torn down]]
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	[[File:Burned_2-3_clutch.jpg\|600px\|Burned 2-3 clutch pack]]		[[File:Burned_2-3_clutch.jpg\|600px\|Burned 2-3 clutch pack]]

	This was the direct problem. The clutch material was burned and mostly worn off.		This was the direct problem. The clutch material was burned and mostly worn off. But why?

	[[File:Other_good_clutches.jpg\|600px\|Good clutches]]		[[File:Other_good_clutches.jpg\|600px\|Good clutches]]
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	[[File:Gear_assemblies.jpg\|600px\|Planetary gears]]		[[File:Gear_assemblies.jpg\|600px\|Planetary gears]]

	All the gears were in good condition, end play in spec for the spiders.		All the gears were in good condition, end play in spec for the spiders. I ordered a complete rebuild kit with all new frictions and steels, bushings, gaskets, seals, etc.

	[[File:Drum_reassembly.jpg\|600px\|Reassembling clutch drum]]		[[File:Drum_reassembly.jpg\|600px\|Reassembling clutch drum]]

Elijah at 16:25, 12 May 2020

2020-05-12T16:25:35Z

← Older revision		Revision as of 16:25, 12 May 2020
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	All parts of the transmission installed. End play checked, right in the middle of the spec.		All parts of the transmission installed. End play checked, right in the middle of the spec.

			[[File:Band_servo.jpg\|600px\|Band servo]]

			Servo rebuilt and end play checked. All was good here as well.

			[[File:Valve_body_assembled.jpg\|600px\|Valve body]]

			I tore the whole valve body down, cleaned and inspected everything. The valve that controls TC lockup was slightly worn, as is apparently common for these transmissions. We did the modification to make the converter lock completely instead of allowing a partial slip as it comes from the factory.

			[[File:Transmission_reinstall.jpg\|600px\|Ready for re-install]]

			Here it is, ready to be re-installed. This was a big job. I didn't take any pictures of it but the pressure regulator in the pump was also worn. A local transmission shop bored that out and installed an aftermarket cartridge that improves line pressure rise vs rpm response. One of the check balls had significantly worn through the separator plate as well. After it was all back together and I drove it around, everything worked but I was still seeing a "flare" on the 2-3 shift, indicating slippage. Not good. I went back to the local transmission shop and we put a pressure gauge and his scan tool on it, then drove around. He noticed that the pressure gauge indicated the pressure was unusually low when shifting, probably causing the slippery shifts. But back at the shop, he used the scan tool to manually command different pressures to the transmission and saw on the pressure gauge that it was indeed outputting the correct pressure. Hmmm. At that point he suggested I go to the local pick-a-part and get another computer module. He had seen this before and a new computer resolved it. Sure enough, after swapping the module for a similar one, the problem went away and it shifted perfectly! I usually figure the PCM is the last thing to fail, but in this case I actually found a service bulletin issued that described this exact problem:


			{{pdf\|2010-02-07_003951_no_2-3_upshift.pdf\|TSB #00-07-30-026: Auto. Trans. 1-2 and/or 2-3 Upshift Slip/Flare, No 3rd/4th (Revise VCM Wiring) - (Dec 21, 2000)}}

Elijah: Created page with "The transmission started slipping in 3rd gear as if it had gone into neutral. Transmission after removal from the truck Getting the..."

2020-05-12T06:31:24Z

Created page with "The transmission started slipping in 3rd gear as if it had gone into neutral. 600px|Transmission after removal from the truck Getting the..."

New page

The transmission started slipping in 3rd gear as if it had gone into neutral.

[[File:Transmission_removed.jpg|600px|Transmission after removal from the truck]]

Getting the transmission out is half the job!

[[File:Xmission_torn_down1.jpg|600px|Torn down]]

Initial tear down.

[[File:Broken_sun_shell.jpg|600px|Broken sunshell]]

This problem was immediately obvious! The splines from the mating part were still engaging in the edge of the shell though, so it hadn't actually let go yet.

[[File:Burned_2-3_clutch.jpg|600px|Burned 2-3 clutch pack]]

This was the direct problem. The clutch material was burned and mostly worn off.

[[File:Other_good_clutches.jpg|600px|Good clutches]]

All other clutches in the system were still in good condition.

[[File:Disassemble_clutch_packs.jpg|600px|Disassembling clutch pack]]

I disassembled all the clutch packs for thorough cleaning and inspection.

[[File:Gear_assemblies.jpg|600px|Planetary gears]]

All the gears were in good condition, end play in spec for the spiders.

[[File:Drum_reassembly.jpg|600px|Reassembling clutch drum]]

Reassembling the input drum.

[[File:Reverse_reinstall.jpg|600px|Installing the reverse clutch]]

Reinstalling the reverse clutch. This is the only one you can't really do with regular clamps.

[[File:New_bushings.jpg|600px|Bushings]]

All bushings replaced.

[[File:Parts.jpg|600px|Final assembly]]

All parts ready for re-assembly.

[[File:Drum_installed.jpg|600px|Input drum installed]]

All parts of the transmission installed. End play checked, right in the middle of the spec.