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10-28-2017, 05:56 AM
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#1 |
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Registered User
Join Date: Feb 2017
Location: reno nv
Posts: 64
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noticed th350 slipping
my c20 th350 recently began slipping, have only noticed slip in first and reverse. am generally happy with th350 if I stick with it and rebuild, is it possible to have final third gear changed from 1.0 to say 0.90 ? running 4.1 rear gear but planning on changing that at some point.
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10-28-2017, 07:39 AM
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#2 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,862
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Re: noticed th350 slipping
Not possible. The unit is designed to run at 1:1 final drive. Not as simple as a gear change in a manual transmission. Even if you could, you would only have three gears and sacrifice 3rd.
I assume your fluid is topped off and it still slips. Does the fluid look burnt?
__________________
"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 ~ Last edited by special-K; 10-30-2017 at 07:51 AM. |
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10-28-2017, 07:55 AM
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#3 | |
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Registered User
Join Date: Oct 2017
Location: Manitoba, Canada
Posts: 141
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Re: noticed th350 slipping
Quote:
__________________
**RED SEAL CERTIFIED JOURNEYMAN SINCE 1993** My 1966 GMC Value Van Project 1951 GMC 9430 1-Ton I'm just going to put an OUT-OF-ORDER sign on my forehead... and call it a day. |
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10-29-2017, 05:28 PM
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#4 |
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Registered User
Join Date: Feb 2012
Location: Southern Ohio
Posts: 292
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Re: noticed th350 slipping
3rd "gear" has no reduction, the power is transmitted at a 1:1 ratio straight through to the output shaft. Overdrive transmissions have another gearset for the task.
__________________
1970 C10 Turbo LM7 5.3/LS6 cam PT7675/4L80E/Holley Dominator EFI/E85 Moser 9" 3.25/4 wheel discs 11.16@121.07 |
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10-29-2017, 07:09 PM
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#5 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,176
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Re: noticed th350 slipping
Look into putting a 200R4 into the truck...same length as a T350...has overdrive...and can be built pretty stout ,...
Just my two cents worth 
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10-29-2017, 07:11 PM
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#6 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: noticed th350 slipping
Nothing in common with first and reverse. It would be strange to have those symptoms in common.
The gear set turns as a locked unit in third so no way to get an overdrive ratio
__________________
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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