mph difference

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11-19-2005, 05:01 PM

thirdgenlover

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Car: 87 trans am

Engine: 350 TPI bored .040 over

Transmission: modified 700r4

Axle/Gears: stock spline, 3.73 Eaton posi

mph difference

i have an 87 trans am with an 87 camaro rs posi 2.73 posi unit, at 60 mph, im doing 1500 rpms, i recently put a set of 3.73 posi unit in it as was wondering if anybody has done this and knows what the mph difference would be now, i was told around 15-18 mph off. Does anybody know exactlly the difference, and have you ever had it sent off to get it calibrated.

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11-19-2005, 07:03 PM

92rsbowtie

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Car: 92 rs camaro

Engine: 305 lo3

Transmission: WC t-5

your on the cooling board, someone is drivetrains should be able to help you

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11-19-2005, 08:39 PM

thirdgenlover

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Car: 87 trans am

Engine: 350 TPI bored .040 over

Transmission: modified 700r4

Axle/Gears: stock spline, 3.73 Eaton posi

im sorry but why does it say rearends on the listings of things to talk about

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11-19-2005, 08:43 PM

Lo-tec

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Car: clapped out 84Z

Engine: 355 efi roller

Transmission: tremec TKO

3.73/2.73=1.366 or 36.6% off. It is not a specific mph off, just a percentage at any given speed. And yes, this is the wrong board.

However, if you have an auto with 215/65/15, 235/60/15, 255/60/16 tires or a roughly equivalent 26" diameter the correct speedo gears are 45 and 15.