70 GTO Drivetrain Number Locations - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 08-09-2017, 09:22 PM Thread Starter
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70 GTO Drivetrain Number Locations

I am looking at an all matching number 70 Judge. I need to know where the VIN numbers appear on the trans and motor?
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post #2 of 4 (permalink) Old 08-10-2017, 12:00 AM
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Almost every owner of a GTO Judge will have PHS documentation. Those documents should list the Engine Unit Number the Transmission Serial number and a diagram showing where to find these numbers as well as the partial VIN.

Partial VIN on engine is front of block, stamped vertically in the right side near the timing chain cover....area behind where the lower radiator hose connects.

Partial VIN location on trans depends on the transmission type.

If you are serious about purchasing the vehicle then it would be money well spent to send for your own copy of the PHS docs just help authenticate the car. PHS offers a fax back service for just this purpose.

Good luck with the purchase.

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post #3 of 4 (permalink) Old 08-10-2017, 10:37 PM
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Welcome to the forum. On the partial VIN, out of all but one assembly plant, it should be stamped upright on the passenger side face next to the timing cover. The Fremont plant (Z) is an exception, & the partial VIN will often be stamped diagonally higher up, often within 2 inches of the assembly number & the two letter block ID code.

On invoice copies from PHS, there will be no assembly number (aka engine unit number) listed on the invoice copy on '69 & later Pontiacs. There was only a slight window in time when that number was provided on the billing cards. Typically, one will see this number or a partial version printed on billing cards for '67's & early '68 Pontiacs built out of a few but not all assembly plants. Pontiacs of the 70 model year that were imported to Canada, or built in Canada (Oshawa plant), documentation can be purchased through GM of Canada. On those particular cars, the engine assembly number is listed on the formatted sheet that George sends you.

On original Muncie 4 speeds, early '70 models received the "660" case, later Muncie 4speeds beginning in about Dec of '69 started showing up with the "661" main case. These numbers are the last three casting numbers of the main case, noted on the passenger side of the alum case. The actual partial VIN is typically stamped on the top of the case, ner the flangecara with the midplate, usually very close to parallel to where the P0xxX Muncie date code is stamped. There were at least two different fonts of stamps used in the gangstamp tool for the lte '68+ partial VIN stampings. The size/font depended on which assembly plant. There are many "stampers" out there, & unless one truly knows what to look for, it is very hard to spot a later stamped original Muncie case. If the transmission is a Turbo 400 it will be coded PD if behind a '70 YZ or XP engine. That two letter ID code, along with an assembly number is stamped onto a silkcreened alum tag that is held with a brad type fastener on the drivers side of the turbo 400 main case. Below the alum tag with the ID code is a a flat area right above the pan rail. This area is no more than 3/16" tall. In this area on the drivers side above the pan rail wil be the partial VIN. It should be the exact same font as is stamped into the face of the block. if two different styles of fonts, something is amiss.

Last edited by Pinion head; 08-10-2017 at 10:47 PM.
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post #4 of 4 (permalink) Old 08-11-2017, 02:22 PM
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Thanks for the clarification on the engine unit number and trans number. The BHC for my 68 has both numbers....I didn't realize that was uncommon.
Love learning about this sort of stuff....

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