TX-Ripper
Well-Known Member
- Thread starter
- #1
Let’s talk about 10r80 Starting Line Ratios (SLR):
The coyote engine has a 92.7mm stroke or roughly 3.65”
cartechbooks.com says we should be around 10.5 to 11 starting line ratio (3500lb-4500lbs)
Per Wikipedia the Ford 10r80 has roughly a 4.70 1st gear ratio and 2.99 2nd gear ratio
Using 2nd gear leave (2.99 gear ratio) gets you a much better SLR
Quick math
3.55 rear axle gear
3.55 x 4.70 = SLR 16.685
3.55 x 2.99 = SLR 10.614
3.31 rear axle gear
1st gear leave with 3.31 x 4.70 = SLR 15.557
2nd gear lave with 3.31 x 2.99 = SLR 9.896
3.15 rear axle gear
1st gear leave with 3.15 x 4.70 = SLR 14.805
2nd gear lave with 3.15 x 2.99 = SLR 9.418
10r80 7th gear clutches die fast on Power adder cars and 3.55 have most shifting into 7th gear right at the 1320.
But using a 2nd gear leave with 3.55 looks to have the most ideal SLR.
What are your thoughts on SLR with 10r80?
The coyote engine has a 92.7mm stroke or roughly 3.65”
cartechbooks.com says we should be around 10.5 to 11 starting line ratio (3500lb-4500lbs)
Per Wikipedia the Ford 10r80 has roughly a 4.70 1st gear ratio and 2.99 2nd gear ratio
Using 2nd gear leave (2.99 gear ratio) gets you a much better SLR
Quick math
3.55 rear axle gear
3.55 x 4.70 = SLR 16.685
3.55 x 2.99 = SLR 10.614
3.31 rear axle gear
1st gear leave with 3.31 x 4.70 = SLR 15.557
2nd gear lave with 3.31 x 2.99 = SLR 9.896
3.15 rear axle gear
1st gear leave with 3.15 x 4.70 = SLR 14.805
2nd gear lave with 3.15 x 2.99 = SLR 9.418
10r80 7th gear clutches die fast on Power adder cars and 3.55 have most shifting into 7th gear right at the 1320.
But using a 2nd gear leave with 3.55 looks to have the most ideal SLR.
What are your thoughts on SLR with 10r80?
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