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#1 |
Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Changed my tranny fluid, filter, and gasket today. Very pleased
First off, wanted to thank SSTim for letting me pick his brain before, during, and after this project. You really were a big help
Much to my surprise, I discovered I have the beefier TH400 transmission. Cool! While I was at it, I bought a new transmission filter and gasket. I got it from Autozone for about $8. The box includes both the filter and the pan gasket. I went with Valvoline Max Life full synthetic, that includes seal and gasket conditioners to help prevent leaks. I also substituted one bottle of Lucas tranny fix, because I like how it worked in there before the drain. There isn't a drain plug. You just have to losten some of the bolts, and it'll start draining (very slowly). I got tired of waiting, and just removed the pan, and then cleaned up the crime scene on the ground later. I then cleaned the bottom of the pan out with clean paper shop towels, installed the new filter, and buttoned everything back up. Fill it through the dipstick hole with a funnel. Put in a couple quarts, then do a half a quart at a time, checking the fluid with the engine running and taking care not to overfill by much Boy, the truck runs great! Shifts well and runs awesome. I ran it hard on the second leg of my test drive, and it's definitely got some good power. So, in the past few weeks, I've changed the differential fluid, engine oil and filter, and now the transmission. The old beast is happy with me, and I have a deeper appreciation for how well this rig is put together with the huge 3/4 ton rear diff and beefy TH400 transmission. Posted via Mobile Device |
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#2 |
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Join Date: Jun 2012
Posts: 1,089
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Might take a look at the brake fluid next, my 70 had what i would call chocolate pudding instead of fluid in the master cylinder..lol. never know how long its been since these things where changed.
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#3 | |
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Join Date: Oct 2012
Location: Salt Lake City, Utah
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#4 |
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Join Date: Dec 2012
Location: Backwoods, OR
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Excellent info. Not to hijack but what determines which transmission was put in?
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'69 K20 350/4 speed/Rockwell/D44/HO52. "orange rhymes with door hinge" |
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#5 | |
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Join Date: Oct 2012
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#6 |
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Join Date: Aug 2010
Location: Edwards, CA
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
There are lots of variables when it comes to transmissions and drivetrains.
The powerglide (M35) or turbo-hydramatics (M49) will be differentiated on the SPID. But the SPID will NOT tell which turbo-hydramatic is installed. Mister-B, Your welcome! Happy to be of help when I can. Glad everything worked out well for you.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban Last edited by SS Tim; 04-01-2013 at 03:06 AM. |
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#7 |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Since at this point a transmission could be swapped,you go by the shape of the pan,the TH400 is also larger/deeper,and TH400 has electric kickdown (wire) and TH350 has cable hooked to carb
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#8 |
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Join Date: Jun 2010
Location: Upland Ca
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Mr B, great work!
I think Spartan was asking what determined 350 VS 400 as it was going down the assembly line? Posted via Mobile Device
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#9 | |
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Join Date: Oct 2012
Location: Salt Lake City, Utah
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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Mine is a 3/4 ton long bed fleet side, with a 350 V8. A th400 just makes sense. I guess the th400 could have been an option, or thrown in at different trim levels too. Tim can tell us more info Posted via Mobile Device |
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#10 |
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Join Date: Dec 2012
Location: Backwoods, OR
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Thanks folks. I heard different ideas as to why 350 vs 400. Some said supply was determining factor. Others said optioned per customer request. Like Mister-B said heavier duty.
...and to keep things on track I just want to applaud mister-b for his contribution to this site. Doing all these how-to threads as he does them helps and doing them in an apt. Complex and not a fancy shop just adds to the "I can do it" factor. Thanks Posted via Mobile Device
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'69 K20 350/4 speed/Rockwell/D44/HO52. "orange rhymes with door hinge" |
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#11 |
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Join Date: Oct 2012
Location: Ravenel SC
Posts: 317
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Great job A.J.!!
I to have a transmission question regarding the 400's. Mine has a vacuum line to it. I have not noticed an electric line to it , but I haven't really looked for one. My motor is out of a 72 chevelle though. Where the transmission came from I don't know. Is there a way to run numbers on them as well? Posted via Mobile Device
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Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!! ![]() |
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#12 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
No TH350's ever came behind a Big Block in any Chevrolet or GMC to my knowledge. The TH400 came out around the time the 396 did. So it could handle the TQ that the Big Blocks were putting out.
Whether a TH400 was available behind a Small Block I'm not sure. But a TH400 eats about 40 HP just to turn it over a TH350. So I am doubting they came behind Small Blocks from the factory. But I'm sure there is a truck somewhere that has a TH400 behind a Small Block from the factory. Gary
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#13 |
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Join Date: Aug 2006
Location: Bulverde, TX
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
I know some late 70s/early 80's 1 tons with 350 engines had t400 trans behind them for what it's worth.
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#14 | |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#15 | |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#16 | |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#17 |
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Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
Wow there is a lot of guessing going on here.
Like I said earlier there were three possible automatic transmissions the two-speed powerglide the TH350 and the TH400. From a truck standpoint the TH400 is the most desirable. That said the powerglide is the least desirable, two-speeds just are not enough for a loaded truck. While a powerglide/250 C20 was offered and sold it is a rather slugish truck. The TH400 was the first trans. offered and the TH350 was phased into production as it was developed. Probably the easiest way to break this down is first that hard and fast rules won't work. Second I don't have a magic chart giving the exact trans. for any given year truck, powertrain and option content. But we can generalize it a lot and for the the most part if you expect a TH350 and find a TH400 be happy. They are not hard to tell apart. Pan shape is the first. The vacuum modulator location (front right on a TH400 and right rear on a TH350). The TH400 uses an electric kickdown switch (the connector is on the left side of the trans.) and The TH350 uses a cable control (on the right front of the trans. forward of the dipstick tube). So lets try this, Trucks that probably have TH400s C30 Earlier (69 down) C20 Big Block C20 Big Block C10 Trucks that probably have TH350s Other than Big Block C20 Other than Big Block C10 Trucks that are only going to be TH350 from the factory. K10 K20
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#18 | ||||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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Thats cool as all get out. ![]() Gary
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#19 | |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
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#20 |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
It took 4 quarts of tranny fluid, plus one (I believe it was a 24 ounce) bottle of Lucas Tranny additive. It's sitting just barely over the full mark. Like I say, I added 2 quarts, then added the rest a half quart at a time until it was full
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#21 |
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Join Date: Sep 2005
Location: Canton North carolina
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
The 67-68 could be optioned with either power glide or th400 . My 68 had base v8 with th400 in 1/2 ton . 69 would have been first years of m49 th350 or th400 confusion. It was based on heavy duty and or big block option. 67-68 3speed auto recieved th400 exclusively as itvwascthe ONLY three speed auto...
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#22 |
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Re: Changed my tranny fluid, filter, and gasket today. Very pleased
You are correct and now I see the hole in my lists.
So this is probably more correct. 67-72 Trucks that probably have TH400s C30 69 C20 Big Block C20 Big Block C10 67-68 C10-30 69-72 Trucks that probably have TH350s 70 up other than Big Block C20 69 up other than Big Block C10 Trucks that are only going to be TH350 from the factory. 69-72 K10 69-72 K20
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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