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#1 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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1972 Chevy - Transmission Leaking
Okay, pretty sure the front pump seal is shot, when you drive it there's spots on the ground. To me, that's a given.
SOO, we're going to pull it out and put a front pump seal and tailshaft seal in it. Any other seals you can think of to put in while it's out? Otherwise, I haven't taken the transmission out of this truck yet and am looking for any tips. Is it a 4 bolt main? I've did the same on a powerglide and think that the procedure should be the same. Trans shift lever Vacuum lines Rear Trans Mount (xmember?) Front bolts Drop........ Sound right? |
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#2 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: 1972 Chevy - Transmission Leaking
Good time to replace the dipstick o-ring. If it's same as mine, you'll need a #113.... 3/4" OD, 9/16" ID, and 3/32" thickness.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#3 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
Okay thank!
Does everything else look right regarding removal? |
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#4 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: 1972 Chevy - Transmission Leaking
Can't help with that, sorry.... I've never had to pull the trans.
Give it time, someone else with experience will jump on here.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#5 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
Thanks for your feedback
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#6 |
20' Daredevil (Ret)
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Location: Jefferson State
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Re: 1972 Chevy - Transmission Leaking
No problem. BTW, I have some extra dipstick o-rings... if you PM me your mailing info, I'll send you one.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
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#8 |
20' Daredevil (Ret)
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Location: Jefferson State
Posts: 13,647
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Re: 1972 Chevy - Transmission Leaking
Yeah, they're cheap & easy to find. I spent more time figuring out which size to buy (the one I removed, which had been leaking, was one size too small). I bought a pack of ten and only used one..... The offer stands though.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#9 |
Registered User
Join Date: Apr 2012
Location: Henderson Nevada
Posts: 804
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Re: 1972 Chevy - Transmission Leaking
Down shift seal also and the shifter shaft seal.
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#10 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
So.........
Replace: Front Pump Seal Dipstick/Speedo Orings Downshift and shift seal Rear Tail Shaft seal What about the pump bushing? |
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#11 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: 1972 Chevy - Transmission Leaking
How many miles are on this transmission? If it's the original 40 year old TH350... might be wise to just have it rebuilt.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#12 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
No, it's been rebuilt and shifts GOOD. It was my grandpas and it sat for a while, we just started driving it daily and now she's leaking
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#13 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
I found this image, looks like the smaller seal that goes around the output shaft, O-ring behind the pump, and the others mentioned
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#14 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
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Re: 1972 Chevy - Transmission Leaking
Gotta take the starter out and drive shaft ,take the flywheel/flexplate bolts
out allso,plus the bell housing bolts.
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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#15 |
Registered User
Join Date: Mar 2010
Location: Shawnee, OK
Posts: 63
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Re: 1972 Chevy - Transmission Leaking
Shouldnt have to pull the starter...i never have
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71 GMC long bed 70 Chevy short step 71 Chevy K10 long bed |
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#16 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
I can only hope somebody is online now that KNOWS which direction the O-Ring (#4 Pictured above) goes. On one edge there is a beveled edge with a blue mark and on the opposite edge it's flat and just black.
Which way does it install? The beveled edge out (towards the transmission) or beveled edge in (towards the pump) |
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#17 |
Registered User
Join Date: May 2008
Location: California
Posts: 161
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Re: 1972 Chevy - Transmission Leaking
Well, the beveled edge goes out....
To remove the tranny on a 72 long bed you have to: Remove the driveshaft at the axle, unbolt carrier bearing Unbolt rear transmission on Xmember and Slide X-member back Unbolt Torque Converter from Flywheel Unbolt transmission lines, speedo cable, and vaccuum lines |
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#18 |
Project '67 454
Join Date: Jan 2009
Location: Columbia SC
Posts: 283
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Re: 1972 Chevy - Transmission Leaking
I'm not a tranny expert but i did just do this to mine. The only seal I didn't replace before I put the tranny in after it sat was the #4 o-ring, turned out it was dry rotted. You'll want the #6 gasket too (my replacement looked slightly different from the one that was in there but worked fine, just make sure you line it up the way the old one comes out)
You need to stand the tranny strait up before removing the pump housing so the clutches don't fall out. Also mark the case and pump housing before you separate them. I was told not to take the pump apart or I would need an alignment tool to put it back together. And yes the blue line goes out. Good Luck,
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67 C-10 SWB Fleetside 454 (current project) ![]() 99 Crewcab SWB Dually 454 ![]() 75 Datsun 280ZZ430 ![]() 94 Formula 232LS 454 ![]() |
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