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03-07-2018, 02:27 PM
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#1 |
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Registered User
Join Date: Feb 2004
Location: FOnd du Lac, WI.
Posts: 32
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How to identify auto tranny type?
I'm trying to make sure what type of automatic transmission that's on my grandsons 1972
C/20 Delux. It has a 350 engine but not sure if it's a t350 or t400. It needs to be replaced and I want to make sure we get it right when looking for another. Can any one out there give me some sure indicators on what to look for to tell if it's a t350 or t400 on the truck now. It is the original tranny. Thanks |
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03-07-2018, 02:34 PM
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#2 |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: How to identify auto tranny type?
Here you go.
700r-4 also applies to the 4L60 and 4L60-E
__________________
"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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03-07-2018, 02:37 PM
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#3 |
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Post Whore
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,268
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Re: How to identify auto tranny type?
Those are transmission oil pan shapes. Compare them to yours to decide which one you have.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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03-07-2018, 02:37 PM
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#4 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,629
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Re: How to identify auto tranny type?
-
Here is another one. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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03-07-2018, 02:38 PM
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#5 |
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Registered User
Join Date: Nov 2014
Location: Lincoln City DE
Posts: 1,292
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Re: How to identify auto tranny type?
__________________
Stan 67 swb BLU MULE posted via flip-fone |
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03-07-2018, 03:19 PM
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#6 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,702
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Re: How to identify auto tranny type?
When you look for a replacement, make sure you get one with the correct tail shaft housing length.
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03-07-2018, 04:05 PM
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#7 | |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,575
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Re: How to identify auto tranny type?
Quote:
OP- see if you can post a picture. It can save a lot of pain. What are the symptoms that you deem make replacement necessary?
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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03-08-2018, 11:53 AM
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#8 |
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Registered User
Join Date: Feb 2004
Location: FOnd du Lac, WI.
Posts: 32
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Re: How to identify auto tranny type?
It slips bad in first gear when starting out, unless you baby it when you take off.
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03-08-2018, 01:13 PM
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#9 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,159
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Re: How to identify auto tranny type?
I would have yours built instead of getting another. You know it fits, you know a little about it. It has to come out anyway, just build it. But you might service it and it may go a bit longer. Could be the filter is clogged. I would at least pull the pan and take a look.
Another tell-apart is a TH350 has the vacuum modulator at the rear of the trans while a TH400 has the modulator on the right side towards the front.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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03-08-2018, 02:31 PM
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#10 | |
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Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: How to identify auto tranny type?
Quote:
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03-08-2018, 02:36 PM
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#11 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,385
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Re: How to identify auto tranny type?
Another...late transmissions do not have vacuum modulators, oldies do...
Powerglide, modulator is behind pan on drivers side TH350, modulator is behind pan on pass side. TH400 modulator is forward of pan on pass aide, usually visible from under hood... |
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03-09-2018, 01:51 AM
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#12 |
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Senior Member
Join Date: Mar 2016
Location: Near Canon City ,Colorado
Posts: 4,019
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Re: How to identify auto tranny type?
th350 has detent cable on drivers side of carb. th400 has electric kickdown switch on throttle pedal inside cab
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'35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203  MIKE |
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