Changing TH350 transmission gasket - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Luke73 · 10-28-2005, 03:21 AM

How do I replace the tranny gasket on a TH350 on my 1973 C20. It seems that there is a crossmemeber in the way. I can't get to all the bolts on the pan. What do I need to do?

Thanks,
Luke

apstguy · 10-28-2005, 04:40 PM

You'll need to jack up the tranny and unbolt the crossmember and tranny mount. Easiest way to jack it up without getting in the way is to jack up the tailhousing.

Luke73 · 10-28-2005, 07:17 PM

Thanks for your help.

Luke

Prerunner1982 · 10-29-2005, 05:19 PM

i changed mine and dont remember ever having to jack up the trans.. of course mine is an 82 c10... dont think that should make a difference though.

Slonaker · 10-29-2005, 05:21 PM

I used a 1/4 drive socket and a swivel on mine. I did not have to do jack up the trans.

Slonaker

jimfulco · 10-29-2005, 11:38 PM

I think production tolerances must have been a bit squirrelly back then, because my '79 Sub requires jacking up the trans to get to a couple of the rear pan bolts. Luck of the draw, I guess.

apstguy · 10-30-2005, 01:37 AM

With my 700, it is impossibe to take the rear bolts out without taking the cross-member out. Of course I have a deep pan and allen head bolts.

**swervin ervin** · 10-30-2005, 11:36 AM

Tyler,

when I had my stock 700R4 crossmember in my truck, I had to jack up the tranny to remove the pan. Either that or take the stock y-pipe loose so I could gain enough room to get it off. I quickly tired of that junk and notched the crossmember lip a tad so it would drop down without having to remove anything. I could reach the rear bolts without removing anything but couldn't get the pan off. Sometimes I wonder what the engineers are thinking when they design this stuff.

87 STEPPER · 11-01-2005, 10:34 AM

On my '87 with a 700r4 i also notched the crossmember lip the length of the pan and i also wacked off the two little tabs on the tranny oil pan and i have no problem at all i can remove & install the bolts and remove & install the pan with the cross member in place.

Im not shure if the TH350 truck cross members can be notched the way i did mine but if it can i know i wouldn't think twice about doing it.

The cross members on these trucks are way over engineered and a lot of material can be removed without weaking them.

Luke73 · 11-02-2005, 07:58 AM

Hey guys,

Thanks for all of the replys. I think I am going to notch the lip of the crossmember. This will make it easier to get to. Lots of steel left on the crossmember after I notch it out.

Thanks,
Luke

10-28-2005, 03:21 AM	#1
Luke73 Registered User Join Date: Mar 2003 Location: Havertown, PA Posts: 15	Changing TH350 transmission gasket How do I replace the tranny gasket on a TH350 on my 1973 C20. It seems that there is a crossmemeber in the way. I can't get to all the bolts on the pan. What do I need to do? Thanks, Luke

10-28-2005, 04:40 PM	#2
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Re: Changing TH350 transmission gasket You'll need to jack up the tranny and unbolt the crossmember and tranny mount. Easiest way to jack it up without getting in the way is to jack up the tailhousing. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

10-28-2005, 07:17 PM	#3
Luke73 Registered User Join Date: Mar 2003 Location: Havertown, PA Posts: 15	Re: Changing TH350 transmission gasket Thanks for your help. Luke

10-29-2005, 05:19 PM	#4
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	Re: Changing TH350 transmission gasket i changed mine and dont remember ever having to jack up the trans.. of course mine is an 82 c10... dont think that should make a difference though. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

10-29-2005, 05:21 PM	#5
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: Changing TH350 transmission gasket I used a 1/4 drive socket and a swivel on mine. I did not have to do jack up the trans. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

10-29-2005, 11:38 PM	#6
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Re: Changing TH350 transmission gasket I think production tolerances must have been a bit squirrelly back then, because my '79 Sub requires jacking up the trans to get to a couple of the rear pan bolts. Luck of the draw, I guess.

10-30-2005, 01:37 AM	#7
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Re: Changing TH350 transmission gasket With my 700, it is impossibe to take the rear bolts out without taking the cross-member out. Of course I have a deep pan and allen head bolts. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

10-30-2005, 11:36 AM	#8
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Re: Changing TH350 transmission gasket Tyler, when I had my stock 700R4 crossmember in my truck, I had to jack up the tranny to remove the pan. Either that or take the stock y-pipe loose so I could gain enough room to get it off. I quickly tired of that junk and notched the crossmember lip a tad so it would drop down without having to remove anything. I could reach the rear bolts without removing anything but couldn't get the pan off. Sometimes I wonder what the engineers are thinking when they design this stuff. __________________ Mike 1985 Chevy C-10

11-01-2005, 10:34 AM	#9
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Re: Changing TH350 transmission gasket On my '87 with a 700r4 i also notched the crossmember lip the length of the pan and i also wacked off the two little tabs on the tranny oil pan and i have no problem at all i can remove & install the bolts and remove & install the pan with the cross member in place. Im not shure if the TH350 truck cross members can be notched the way i did mine but if it can i know i wouldn't think twice about doing it. The cross members on these trucks are way over engineered and a lot of material can be removed without weaking them. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

11-02-2005, 07:58 AM	#10
Luke73 Registered User Join Date: Mar 2003 Location: Havertown, PA Posts: 15	Re: Changing TH350 transmission gasket Hey guys, Thanks for all of the replys. I think I am going to notch the lip of the crossmember. This will make it easier to get to. Lots of steel left on the crossmember after I notch it out. Thanks, Luke



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