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#1 |
Registered User
Join Date: Mar 2013
Location: Lebanon, MO
Posts: 6
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turbo 400 id tag info
I need some help in decoding this id tag. I have done many searches and can't find any info on this type of tag numbers. All I have seen have 2 letter codes not 3 letters as this one has. By the pan style it is a TH400, but i would like to know the year and what it was used in.
TAG reads: (if you can't see the pic) 280 87 LCA 4134 The case bellhousing has "HD" & "39" embossed into the casting. The tail is 9" with a 27spline shaft. Any help would be great, thanks. |
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
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Re: turbo 400 id tag info
27 spline output in a 400 case usually dictates a T375, normally found in the 70s ish.....station wagons
Look at the bottom of the tail housing, is should say 375 in the casting |
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#3 |
Registered User
Join Date: Dec 2009
Location: Franklin,PA
Posts: 29
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Re: turbo 400 id tag info
Motors Trans. repair lists it as: 1987 V8-305 R series 1/2 ton
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#4 |
Registered User
Join Date: Mar 2013
Location: Lebanon, MO
Posts: 6
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Re: turbo 400 id tag info
Thanks 16N67, so is it a 400 or 375? It doesn't have 375 stamped in bottom of tail housing.
Thanks again for the info i couldn't find any list online that had that code listed. only showed two letter codes not three. |
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#5 |
Registered User
Join Date: Dec 2009
Location: Franklin,PA
Posts: 29
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Re: turbo 400 id tag info
GM used to call them a 375 in the 70's, now it seems they are called a 400 with a 350 spline tail shaft. They still made them into the late 80's. Three letter codes started in 87
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#6 |
Registered User
Join Date: Mar 2013
Location: Lebanon, MO
Posts: 6
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Re: turbo 400 id tag info
OK great, so i guess the R series is a 2wd drive truck, correct?
Do you know of any place online that has the three letter codes listed. I called a local drivetrain shop asking about a slip yoke for it and they told me the TH400 didn't have a 27 spline shaft. He kept insisting i had a th350. I told him i know what the pan looks like. But anyway will a slip yoke from a th350 work the same? Also i have a 9" tail housing what length yoke should i get, anything special? thanks again ![]() |
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#7 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
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Re: turbo 400 id tag info
It should take a standard 350 slip with that tail housing
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#8 |
Registered User
Join Date: Dec 2009
Location: Franklin,PA
Posts: 29
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Re: turbo 400 id tag info
I have never found the numbers online. I have the Motors Domestic Transmission manuals that list the codes.
C & R series are the 2wd trucks It takes a regular 350 yoke |
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#9 |
Registered User
Join Date: Jan 2006
Location: Cherry Valley,Ca
Posts: 468
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Re: turbo 400 id tag info
My book says its a 375 from a 87-88 R series with a 305.
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