Recent Posts

91

Engine/Drivetrain / Re: What Transmission do I have?

« Last post by Mr Diesel on November 07, 2025, 03:42:51 pm »

Mixed opinions about whether the 6 bolt was better or different internally.

The 400 is a great transmission.

92

Projects Posts (NOT VEHICLES) / Re: Using 87 C20 frame for a 87 V20

« Last post by bd on November 07, 2025, 03:25:35 pm »

It's funny how after 36 years the confusion has only slightly waned.

93

Projects Posts (NOT VEHICLES) / Re: Using 87 C20 frame for a 87 V20

« Last post by Shifty on November 07, 2025, 02:47:32 pm »

It was tough to be an auto parts counterman after that mistake....

94

Brakes, Frame, Steering & Suspension / Re: Frame ID

« Last post by JohnnyPopper on November 07, 2025, 02:44:58 pm »

Use Chat GPT

95

Engine/Drivetrain / Re: What Transmission do I have?

« Last post by JohnnyPopper on November 07, 2025, 02:40:31 pm »

That makes a lot of sense, Thanks!

It has a deeper pan as well.

Were the 'mixed opinions' about the trans or the application?

96

Projects Posts (NOT VEHICLES) / Re: Using 87 C20 frame for a 87 V20

« Last post by bd on November 07, 2025, 11:39:20 am »

Do you mean R20?

It’s a V20 change to V in 87. The frame is complete rusted and falling a part.

VileZambonie's post simply refers to the thread title, "Using 87 C20 frame for a 87 V20."

GM rebranded the 1987 model year light-duty trucks from "C" to "R" and "K" to "V" for marketing reasons.  Most people rolled their eyes when GM did that.

97

Projects Posts (NOT VEHICLES) / Re: Using 87 C20 frame for a 87 V20

« Last post by dc7432 on November 07, 2025, 10:26:09 am »

It’s a V20 change to V in 87. The frame is complete rusted and falling a part.

98

Engine/Drivetrain / Re: What Transmission do I have?

« Last post by Mr Diesel on November 06, 2025, 06:26:04 pm »

The 6 bolt TC were used on the 6.2 diesel. Supposedly heavier duty. Heard very mixed opinions about that though. Not sure if they had other applications too.

99

Brakes, Frame, Steering & Suspension / Frame ID

« Last post by dc7432 on November 06, 2025, 03:36:39 pm »

Hello all,

Need some help with this frame ID. Looking at a frame with the following letters and numbers trying to decode:
CHF385812 = Chevy, ?, ?, 30, ?, 1975, ?, ?, ?

Thanks in Advnace

100

Engine/Drivetrain / Re: What Transmission do I have?

« Last post by JohnnyPopper on November 05, 2025, 07:39:27 pm »

Chat GPT is your friend.

Given your description (BBC engine + converter with 6 attachment pads + TH400 mention) I believe:

You probably have a heavy‐duty or aftermarket converter that uses a 6-bolt pad layout (possibly built for a TH400 or a TH400‐derived/4L80E application).

It is not a typical factory TH400 behind a BBC but rather an upgraded/modified unit.

The flexplate or converter may have been adapted/swapped for performance/drag use, hence the 6-bolt mounting.