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73-87 Chevy _ GMC Trucks
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TH350 Problems
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Topic: TH350 Problems (Read 14084 times)
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #15 on:
November 22, 2019, 09:34:47 AM »
Ok, i will order a filter and gasket again. Also a new modulator and maybe a new sealkit for the transmission (if the seal between engine and transmission is damaged)
Which nut sizes do i need for the transmission remove? I only have metric nuts...
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Shifty
Junior Member
Posts: 951
I bleed Bowtie red...
Re: TH350 Problems
«
Reply #16 on:
November 22, 2019, 09:37:43 AM »
Might as well invest in a set of SAE sockets and wrenches if you intend to do a lot of work to your elderly Chevy.
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87 V20 Standard Cab Longbed (current)
87 R30 3+3 Longbed (days of yore)
98 C2500 ext cab longbed
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #17 on:
November 23, 2019, 12:46:01 PM »
I will. Till now i try to do it with metric tools but it doesn‘t fits well.
Will give a feedback after i changed the filter, gasket and Modulator!
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uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #18 on:
November 24, 2019, 01:51:58 AM »
Short question:
My wheels have 6 lugnuts! So, no c10 or c20
What can it be?
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Shifty
Junior Member
Posts: 951
I bleed Bowtie red...
Re: TH350 Problems
«
Reply #19 on:
November 25, 2019, 08:47:30 AM »
PM sent.
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87 V20 Standard Cab Longbed (current)
87 R30 3+3 Longbed (days of yore)
98 C2500 ext cab longbed
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: TH350 Problems
«
Reply #20 on:
November 26, 2019, 09:55:51 PM »
the 6 lugs denotes its a k15/10. it can have 8 lugs and be a C/K20 or C/K30. generally the more lugs the higher the gvwr can be. theres other factors that come into play with gvwr but axles are one of them
Logged
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #21 on:
December 02, 2019, 02:43:53 AM »
Thx @irish_alley
My hope is that they only changed the cabin and the wheelebase etc. is the original from the K10.
Before i will check the leakage of the transmission i have to change the radiator
Btw: Does somebody has an emblem for my chevy? It costs 120€ in germany.
«
Last Edit: December 02, 2019, 04:40:07 AM by uprising
»
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uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #22 on:
December 04, 2019, 10:34:25 AM »
dang it...
Today i took a look into my garage and below the truck is a puddle of transfluid. And the trans isn‘t shifting. I switch to „R“, „D“ and „L“ but the truck isn‘t moving. Vacuumproblem or fluidproblem? How can i check the vacuum?
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Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: TH350 Problems
«
Reply #23 on:
December 04, 2019, 11:37:50 AM »
could be it wont move due to the trans fluid being too low
Logged
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #24 on:
December 04, 2019, 12:42:26 PM »
I measured in cold and the fluid is much more the „Hot“. But to be on the save side i will check when engine is running. Any idea, how to check the vacuum?
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bd
Global Moderator
Senior Member
Posts: 6454
Re: TH350 Problems
«
Reply #25 on:
December 04, 2019, 01:23:09 PM »
Describe how you have been checking the fluid level, please. A vacuum issue will not cause the symptoms you describe, but low fluid level will.
You need to take the time to carefully inspect the transmission and find exactly where fluid loss is occurring. Guessing and conjecturing will get you nowhere productive in a hurry.
Logged
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #26 on:
December 04, 2019, 01:34:32 PM »
I just checked the oil with a cold engine. Pull out the dipstick, clean it up, push back in and pull again. The lower is much over the „hot“ line. I have to measure again with a running engine. I can not run the engine until it is hot because the truck stands in my garage!
I think the fluid comes out of the oilpan. I got my new pan and the new gasket and i will change it again. Also i will check the filter.
Which symptoms do i habe if the vacuum has some problems?
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bd
Global Moderator
Senior Member
Posts: 6454
Re: TH350 Problems
«
Reply #27 on:
December 04, 2019, 02:15:35 PM »
FYI - The engine MUST be running with the transmission in park (preferred) or neutral with the emergency brake firmly set (for safety) in order to accurately check the fluid level.
Vacuum problems (such as low-to-zero vacuum) will cause a late, hard shift. This occurs because the modulator valve interprets low engine vacuum (aka, high intake manifold pressure) as an open throttle, mimicking vehicle acceleration. Zero engine vacuum signals wide-open throttle, for instance, times when maximum power is demanded from the engine during hard acceleration.
Look over the transmission carefully before removing the oil pan
to determine the actual source of the fluid leak
. This could save you significant time, expense and frustration.
Logged
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: TH350 Problems
«
Reply #28 on:
December 04, 2019, 04:56:59 PM »
also make sure to torque the trans pan bolts to the right specs. you would be surprised at how many times they get too much tq or not enough and will cause a leak
Logged
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
uprising
Newbie
Posts: 54
Newbie
Re: TH350 Problems
«
Reply #29 on:
December 05, 2019, 11:24:15 PM »
Thanks guys! Appreciate your help!!
I found a torque of 17Nm. Is that really enough? Sounds a little loose... No matter if the gasket it corc or rubber?
Ok, than the vacuum should not be a problem. The trans shifts pretty smooth if its working
I will measure today with a running engine but it won‘t be at hot engine.
The drops falling down on the right side of the pan. Between the screw from pan and the screw from cover (Engine to transmission)
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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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TH350 Problems