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post #1 of 11 (permalink) Old 06-01-2016, 11:29 PM Thread Starter
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289 ?

I have a 68 Fastback with a 289 and I believe a C4 with 2.79 gear.
I have seen mention of a hipo 289 . What is the difference and how can you tell if you have one?
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post #2 of 11 (permalink) Old 06-01-2016, 11:33 PM
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the last year for the hipo 289 was 1967. the engine code letter for the hipo is K. 2.80 gear was for the 8" rear and 2.79 gear was for the 9" rear.

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post #3 of 11 (permalink) Old 06-01-2016, 11:41 PM
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C-code?
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post #4 of 11 (permalink) Old 06-01-2016, 11:59 PM
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You could just google "Ford 289 Hipo" and read all about it, to whatever depth of knowledge you wish. Fastback97 up there is wondering what the 5th digit of your vin is. That would be the engine code.

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post #5 of 11 (permalink) Old 06-02-2016, 12:07 AM Thread Starter
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Ok so it is not a hipo 289 because of the year, but the tag on the diff says it has 2.79 gears ( which is a highway gear) right? But that means it is a 9 inch correct? I am thinking of changing to something a little lower like 3.55 . Is that too low ? Maybe limit slip ? what would you guy suggest ? I am not building a race car but would like to have it quicker than it is.
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post #6 of 11 (permalink) Old 06-02-2016, 12:12 AM
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Quote:
Originally Posted by Vaejovis Carolinanus View Post
Ok so it is not a hipo 289 because of the year, but the tag on the diff says it has 2.79 gears ( which is a highway gear) right? But that means it is a 9 inch correct? I am thinking of changing to something a little lower like 3.55 . Is that too low ? Maybe limit slip ? what would you guy suggest ? I am not building a race car but would like to have it quicker than it is.
How much is fuel economy a factor for you?

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post #7 of 11 (permalink) Old 06-02-2016, 12:13 AM
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Quote:
Originally Posted by Vaejovis Carolinanus View Post
Ok so it is not a hipo 289 because of the year, but the tag on the diff says it has 2.79 gears ( which is a highway gear) right? But that means it is a 9 inch correct? I am thinking of changing to something a little lower like 3.55 . Is that too low ? Maybe limit slip ? what would you guy suggest ? I am not building a race car but would like to have it quicker than it is.
should be a 9". what is the vin letter for the engine code ?

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post #8 of 11 (permalink) Old 06-02-2016, 12:23 AM
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Ok so it is not a hipo 289 because of the year
If its original engine to the '68 its not... If its a transplant there is a remote possibility someone put a HiPo engine in... although you'd probably know it already. If you have a C-code they came with 2-barrel 289's from factory ~ 150HP net.
Do you have a 2-barrel or 4-barel carb?
Stock or modified cam?
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post #9 of 11 (permalink) Old 06-02-2016, 08:04 AM
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What's the rest of the numbers on the axle tag? It should indicate the ring gear diameter as well as the axle code. The '68 289-2V would be pretty easy to ID, around the outside of the cylinder head, just outside the valve cover flange, in the corner, look for a cast "2A". Also, if you pull a valve cover and the head says "289" and has a date code consistent with your cars scheduled build date that's another clue, as is the engine assembly date, stamped in a pad on the front of the drivers side bank just below the cylinder head parting line. Lastly, you COULD have a partial VIN on the back of the engine above the bellhousing flange.

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post #10 of 11 (permalink) Old 06-02-2016, 11:55 AM Thread Starter
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The engine code is a C but the carb is a 4 barrel and the intake appears to be a factory unit.
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post #11 of 11 (permalink) Old 06-02-2016, 12:04 PM
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C-code was originally a 2-barrel so someone upgraded it. Intake should have a part # on the top if its a factory unit.

3.40 or 3.50 gears would be nice for around town and the highway.

Take a picture of the differential case and its easy to ID.
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