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post #1 of 11 (permalink) Old 10-20-2010, 10:52 AM Thread Starter
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Gears

I new at this. I have a stock 1997 Thunderbird. I'm wanting to know what gears are in the 8.8 rear. What would be the best at a average gas mileage
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post #2 of 11 (permalink) Old 10-20-2010, 11:24 AM
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Stock it has 3.27s. Depending how much highway driving you do, either 3.73s or 4.10s would be best in a daily driver. Neither will affect your gas mileage by much, but spinning at 3K on the highway gets old real quick if you do a lot of highway driving. 3.73s put you around 2500-2700 on the highway, which is very livable.

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post #3 of 11 (permalink) Old 10-20-2010, 11:50 AM Thread Starter
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Hey thanks for replying back. Would I have to recalibrate my computer
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post #4 of 11 (permalink) Old 10-20-2010, 11:52 AM
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Hello

I have 3.90's in my 8.8

I though a 8.8 came with 3.08's

I have some 3.55, very popular with late mn12's with an auto.(94-97)
Early got 3.73 or 4.10's Different auto trany ratios(89-93)


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post #5 of 11 (permalink) Old 10-20-2010, 02:18 PM
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Hey thanks for replying back. Would I have to recalibrate my computer
You can go up to 3.73s without needing to get a tune, but shifting won't be optimal no matter how small the change. You do have to change the speedo gear, and beyond 3.73s you need a Speedcal.

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post #6 of 11 (permalink) Old 10-20-2010, 02:19 PM
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I though a 8.8 came with 3.08's
LX's came standard with 3.08s (7.5 or 8.8) with an option to upgrade to 3.27s. In 96-97, 3.27 was standard.

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post #7 of 11 (permalink) Old 10-20-2010, 03:24 PM
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7.5 V6na

Hi

all my Thunderbirds with a V6na had A 7.5 with 3.27 open.

Picked up a 8.8 from a 94(V8). had 3.08 open


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1990 Thunderbird Circle Track Street Stock
351W 2bbl.
C-4 Auto
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post #8 of 11 (permalink) Old 10-20-2010, 07:30 PM Thread Starter
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You can go up to 3.73s without needing to get a tune, but shifting won't be optimal no matter how small the change. You do have to change the speedo gear, and beyond 3.73s you need a Speedcal.
thanks for the info. but what would i change the speedo gear to, I'm still new at this so any info would be very helpful.
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post #9 of 11 (permalink) Old 10-20-2010, 07:50 PM
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thanks for the info. but what would i change the speedo gear to, I'm still new at this so any info would be very helpful.
i think u need the 23tooth speedo gear for 3:73's
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post #10 of 11 (permalink) Old 10-20-2010, 11:25 PM
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No, the 21-tooth purple gear is what you need for 3.73's. A search could have told you that instantly.

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post #11 of 11 (permalink) Old 10-20-2010, 11:49 PM
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And the 23 tooth gear is a bad idea regardless. Search will also explain why.

-Matt
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