mph difference
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Joined: Jul 2005
Posts: 345
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From: Indiana
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.
Thread Starter
Member
Joined: Jul 2005
Posts: 345
Likes: 0
From: Indiana
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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Joined: Jan 2005
Posts: 1,768
Likes: 2
From: Gambrills, Md
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.
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.
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Joined: Jul 2003
Posts: 4,803
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
Originally posted by thirdgenlover
im sorry but why does it say rearends on the listings of things to talk about
im sorry but why does it say rearends on the listings of things to talk about
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