Ok so I've been making and staring at gear ratio charts till I'm blue in the face and want a sanity/gut check please.
Crunching the numbers, 4.56 + MT82 D4 is as close as I'm going to get to 15-17 ratios. I know I can swap in a 15-17 trans but there's a lot more details involved there than I care to address right now. My trans also has only 15k miles on it so planning on putting a trans cooler on it and see if I can get some life out of it.
My question is am I crazy? Seems almost nobody does this. 4.09's are more popular but still super long compared to a closer ratio box or a 15-17 setup. Check out the numbers below. Ideally I would do 4.3's but nobody makes them and neither Yukon or Richmond have any interest to do so.
Car has stock power so with some bolt ons one day for my home tracks I may eventually need 5th but for now 121-125mph in 4th should do it at most tracks. Home tracks are Laguna, Sonoma, Thunderhill, and Buttonwillow.
If I did 4.09's I would definitely not need to get into 5th, but my concern is leaving in-gear acceleration on the table compared to 4.56's. Seems the in-gear acceleration of 4.56's would more than make up for needing 5th occasionally.
2018+ with 4.56 (compared to 3.73):
2018+ with 4.09's (compared to 3.73):
2015-17 with 3.55's:
Thanks in advance guys.
Crunching the numbers, 4.56 + MT82 D4 is as close as I'm going to get to 15-17 ratios. I know I can swap in a 15-17 trans but there's a lot more details involved there than I care to address right now. My trans also has only 15k miles on it so planning on putting a trans cooler on it and see if I can get some life out of it.
My question is am I crazy? Seems almost nobody does this. 4.09's are more popular but still super long compared to a closer ratio box or a 15-17 setup. Check out the numbers below. Ideally I would do 4.3's but nobody makes them and neither Yukon or Richmond have any interest to do so.
Car has stock power so with some bolt ons one day for my home tracks I may eventually need 5th but for now 121-125mph in 4th should do it at most tracks. Home tracks are Laguna, Sonoma, Thunderhill, and Buttonwillow.
If I did 4.09's I would definitely not need to get into 5th, but my concern is leaving in-gear acceleration on the table compared to 4.56's. Seems the in-gear acceleration of 4.56's would more than make up for needing 5th occasionally.
Gearing Analyzer with Shift Tracer
Enter gear ratios, tire and diff ratio to analyze RPM vs velocity at shift points with tracer
www.blocklayer.com
2018+ with 4.56 (compared to 3.73):
2018+ with 4.09's (compared to 3.73):
2015-17 with 3.55's:
Thanks in advance guys.