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@1600rpm, 3.55, 24.5, 13sp, 61mph, is my transmission a direct

@1600rpm, 3.55 rears, 24.5 tires 13 sp trans, 61mph, is my transmission a direct drive, single od or double od ie.74

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Definitely not a 13 direct. And not sure you have the ratio in the back you stated. Neither matches up to 1600 at 61mph.

Here is how it worked out on my spreadsheet with your specs.....

first is 11R24.5

Gear 13 12 11

Tire RPM 473 473 473

Trans Final 0.73 0.86 1

Diff Ratio 3.55 3.55 3.55

Engine RPM

1200 59 50 43

1250 61 52 45

1300 64 54 46

1350 66 56 48

1400 69 58 50

1450 71 60 52

1500 73 62 54

1550 76 64 55

1600 78 66 57

Then low pro 24.5

Gear 13 12 11

Tire RPM 495 495 495

Trans Final 0.73 0.86 1

Diff Ratio 3.55 3.55 3.55

Engine RPM

1200 56 48 41

1250 58 50 43

1300 61 52 44

1350 63 54 46

1400 65 56 48

1450 68 58 50

1500 70 60 51

1550 72 62 53

1600 75 64 55

With a 3.70 ratio, then you would see 1600 at 61 mph with LP 24.5 on a single over with a .86 ratio. With a .74 ratio final, you would have to get into 4.xx territory on rear ratio to even come close to 1600 at 61 mph. If it were a direct drive, then you would have 3.25 rears to get close to 1600 at 60 mph with LP 24.5 rubber.

Double check the rear ratio.

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