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#1 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Th350
Just installed a 406 dart engine built by TriStar. Also put a TH350 stage two in from Performance Automatic. When I shift from park to reverse to neutral to drive, I have nothing in drive. If I shift from 1 to 2 to drive, it goes into drive, but slips bad. 1, 2 and reverse have no slippage!!!! It's not the linkage or detent. Checked both. Performance Automatic is telling me this isn't possible. Can anyone shed some light on this for me????? Thanks in advance.
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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Re: Th350
How much oil did you put in the trans? A complete fill is going to be at least 10 quarts or more
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#3 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
Added 5 quarts. Ran thru gears topped off with 12 total quarts. Deep pan.
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#4 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Th350
Did you pre-fill the converter? wondering if its a pump issue and i'm guessing it's a stall? Any idea how high? I've seen then too high for drive-train combo specs.
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#5 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Th350
Just popped into my head, Could it be a Manuel Valve body and when you put into drive your actually trying to take off in 3rd?
__________________
"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#6 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Th350
Sounds like the low roller is not any good
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#7 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
Not supposed to be a manual valve body. Why when I go reverse, neutral, drive, there is nothing there? But if I go into drive from second, then it goes into gear (but slips). 2500 stall converter, and I did pre fill it before I installed.
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#8 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
First, second and reverse are all there and strong.
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#9 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Th350
Manually? Does it shift up from 1st into 2nd and then 3rd from drive without manually shifting? In other words, If you have to manually shift through 1st and 2nd, then once rolling 3rd is there, Big Dave's right, low reverse roller clutch is out. What exactly does that shop do to a "stage two" 350THM?...One of the first mods I would do is replace the low roller clutch and sprag with a later model and way tougher 700r4 clutch and hardened sprag...If their stage two does that, then it may be on the shop...
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#10 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
when I go into drive at a dead stop, nothing is there as if it were in neutral. If I pull it into second then back into drive, it then goes into gear, but slips bad.
This is all from a dead stop. |
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#11 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Th350
Quote:
![]() ~Ghostrider~ ![]() ![]() ![]()
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() Last edited by Ironangel; 03-22-2016 at 12:59 AM. |
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#12 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
This transmission has zero miles logged on it. Did this as soon as I put it in. I paid $1900.00 for it with convertor. The build sheet says it has : street performance valve body, OEM servo, OEM input shaft, aluminum pan w/drain, raybestos HP clutches, HP race sprag.
It's advertised to handle 550 hp. My engine was dyno'd at 526hp. They will warranty it, but I have to ship it clear across the country. I just put it in and was hoping to fix it in the truck without pulling it and shipping it. My engine pulls 11lbs of vacuum at idle. They told me that might be the problem. What does the vacuum modulator have to do with it going into drive at idle???? Again THANKS for the help!!!! |
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#13 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Th350
Modulator doesn't matter. It's possible that the roller clutch was installed upside down in the race. It's not easy but it can be done.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#14 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Th350
The low roller clutch is deep in the tranny, it has to come out of the vehicle and be disassembled...I paid $1800 for mine but that included a cooler, 2000 stall converter, and a case of Schaeffer's #204SAT All-Trans SupremeŽ...That price tag is what motivated me to learn the "dark art" of automatic transmissions. The 350THM is easy, parts are cheap, and there's a satisfaction and peace of mind when you do your own work.
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#15 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
I pulled it this morning and they are going to send a freight company to pick it up. Been a heavy equipment mechanic all my life, rebuilt automatic transmissions in dozers and loaders. Never been into a TH350. Wouldn't know where to start.
Thanks for all the help from everyone!!!! I hope when they get it they will tell me the truth about what they find. |
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#16 |
Registered User
Join Date: Jan 2016
Location: Saskatchewan
Posts: 357
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Re: Th350
I'd be interested to hear how this all turns out. Sub'd
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1972 C10 - It might be old, but it's not slow |
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#17 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
Me too!!! I will let you know.
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#18 |
Registered User
Join Date: Mar 2016
Location: Rockport Texas
Posts: 11
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Re: Th350
Was a lot of glitter in the oil when I drained it.
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#19 |
Registered User
Join Date: Jan 2016
Location: Saskatchewan
Posts: 357
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Re: Th350
Yikes that's never good.
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1972 C10 - It might be old, but it's not slow |
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#20 |
Registered User
Join Date: Aug 2015
Location: Champaign, IL
Posts: 491
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Re: Th350
Glad to hear they are going to make it right. Sounds like you could have easily fixed it yourself though. There are a lot of people on here who knew nothing about transmissions and bought a book and rebuilt theirs. They say it is easy but I am not sure if I am ballsy enough
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