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#1 |
Registered User
![]() Join Date: Oct 2010
Location: Missouri
Posts: 165
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375 Transmission
Anyone ever heard of a 375 tranny? Tailshaft seems to be the same as 350 will a 350 tourqe conv work in a 375? Any other considerations when swapping a 350 for a 375 that is the same length?
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#2 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: 375 Transmission
It all depends on which one you have read below:
THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It'll be marked 375-THM on the bottom of the tailshaft housing. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. The THM375 and has a long output shaft that mates to the smaller THM350 drive shaft yoke. Internally the clutch packs originally had fewer friction plates. Some "Heavy Duty" THM350s were also designated THM375-B. |
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#3 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,148
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Re: 375 Transmission
I would stay away. It is a strange combination of a TH350 and a TH400. I believe the torque converters do interchange with all 3. There is no aftermarket support. As cheap as you should be able to find TH400 nowadays, that is where I would spend my money. Better yet do a 700R4 swap.
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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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#4 | |
Champagne Taste on Beer Budget
Join Date: Dec 2008
Location: High Ridge, Missouri
Posts: 2,190
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![]() Quote:
Stick with a TH350 or 400; or go overdrive with the 700R4. Good luck
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Coming Soon: Project 1970 Country Truck |
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#5 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: 375 Transmission
If it's a THM375B, it has no relation to THM400.....they are identical to a THM350 with a few heavier duty parts. All aftermarket parts are compatible.
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#6 |
Registered User
![]() Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: 375 Transmission
I had one in an '87 swb silverado, factory. It started slipping and when I pulled it nobody would buy it, coudn't even use it for a core.
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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#7 | |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: 375 Transmission
Quote:
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