Removing a TH400 from a 71 C10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

65 Fastback · 02-12-2016, 04:54 PM

I'm about to remove my transmission for a rebuild.

Using information on this site I put together a short procedure for myself to ensure I don't damage the truck or myself... Please comment if you think I have got it nailed...

• Disconnect the battery
• Remove the dipstick. Remove top bell housing bolts accessed behind distributor
• lift truck as high as possible both ends and support with axel stands- drain oil from trans
• Remove the starter and remove the bolts that connect the torque converter to the flex plate
• Mark your driveline yokes so you know how it was oriented in the truck and remove the drive shaft. (I have the slide in yoke style)
• Remove the speedo assembly
• Remove the oil cooler lines - don't strip!
• Disconnect the transmission shifter linkage
• Check that the transmission will clear the exhaust system.
• Support the trans with a trolley jack under the pan and remove the rear mount and cross member.
• Remove the bolts around the bell housing and remove the dipstick tube.
• Support Motor, roll trans back on the trolley jack a couple of inches and lower the transmission. Man handle trans off jack and slide out from under truck
• Install the transmission using the above instructions in reverse order.

**Ironangel** · 02-13-2016, 08:49 AM

The transmission cross-member (rear support) will have to be unbolted from the frame, two 3/8" bolts each side and two 7/16" bolts in the center mount. THM400 has some electrical to disconnect, not sure if they use a vacuum line or not? You'll want to knock the transmission cross-member back once the bolts are out to clear the tail housing...Wrap the rear seal with a couple of baggies and rubber bands or tape, cuts down on the mess...

65 Fastback · 02-13-2016, 04:18 PM

Quote:

Originally Posted by Ironangel

The transmission cross-member (rear support) will have to be unbolted from the frame, two 3/8" bolts each side and two 7/16" bolts in the center mount. THM400 has some electrical to disconnect, not sure if they use a vacuum line or not? You'll want to knock the transmission cross-member back once the bolts are out to clear the tail housing...Wrap the rear seal with a couple of baggies and rubber bands or tape, cuts down on the mess...

Thanks for the good advice.

**kwmech** · 02-13-2016, 06:05 PM

You do not necessarily have to remove the starter

65 Fastback · 02-13-2016, 08:41 PM

Quote:

Originally Posted by kwmech

You do not necessarily have to remove the starter

Hope fully not, ill soon find out when I get cracking on it. Thanks.

02-12-2016, 04:54 PM	#1
65 Fastback Registered User Join Date: Jan 2009 Location: Perth Australia Posts: 51	Removing a TH400 from a 71 C10 I'm about to remove my transmission for a rebuild. Using information on this site I put together a short procedure for myself to ensure I don't damage the truck or myself... Please comment if you think I have got it nailed... • Disconnect the battery • Remove the dipstick. Remove top bell housing bolts accessed behind distributor • lift truck as high as possible both ends and support with axel stands- drain oil from trans • Remove the starter and remove the bolts that connect the torque converter to the flex plate • Mark your driveline yokes so you know how it was oriented in the truck and remove the drive shaft. (I have the slide in yoke style) • Remove the speedo assembly • Remove the oil cooler lines - don't strip! • Disconnect the transmission shifter linkage • Check that the transmission will clear the exhaust system. • Support the trans with a trolley jack under the pan and remove the rear mount and cross member. • Remove the bolts around the bell housing and remove the dipstick tube. • Support Motor, roll trans back on the trolley jack a couple of inches and lower the transmission. Man handle trans off jack and slide out from under truck • Install the transmission using the above instructions in reverse order.

02-13-2016, 08:49 AM	#2
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Removing a TH400 from a 71 C10 The transmission cross-member (rear support) will have to be unbolted from the frame, two 3/8" bolts each side and two 7/16" bolts in the center mount. THM400 has some electrical to disconnect, not sure if they use a vacuum line or not? You'll want to knock the transmission cross-member back once the bolts are out to clear the tail housing...Wrap the rear seal with a couple of baggies and rubber bands or tape, cuts down on the mess... __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

02-13-2016, 06:05 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,730	Re: Removing a TH400 from a 71 C10 You do not necessarily have to remove the starter



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