4.88's installed, 6-spd Sport S, 37's - Finally

brerran

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I'm running 4.88 with "35 inch" tires with my 6 speed m/t. Looks like basically 2400 rpm's at 70.
I'm enjoying this combination.

 

bgoman

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Finally, Yukon Gears, got it back yesterday, have been working through break in now but can say it's worth it.

I can no throttle clutch crawl through drive thru now lol

Here's actual rpm data in both km/h and mph for Jeepers on both sides of the border.

*Sport S, 6-speed, 4.88, Mopar lift, 37x12.50 Falken MT's. GPS matched km/h, Tazer tire height 36.45", July 3, 2020.
Gearspeedrpmspeedrpmspeedrpm
4th110310012034501303700
5th110250012028001303000
6th110225012025001302700

*Sport S, 6-speed, 4.88, Mopar lift, 37x12.50 Falken MT's. GPS matched mph, Tazer tire height 36.45", July 3, 2020.
Gearspeedrpmspeedrpmspeedrpm
4th683100753450813700
5th682500752800813000
6th682250752500812700

My goal was 24-2500 rpm in 6th at 120 km/h (75 mph) and it does 2500 now. Goal achieved. I was driving essentially a 4-speed manual with the 3.73's and it was only happy on the street. Now i have fully useable 6-speed with no extra fluff at the top end, i don't want to do more than 75 mph in this thing.

3500 RPM Shifts
1st into 2nd = 25 km/h (16 mph)
2nd into 3rd = 47 km/h (29 mph)
3rd into 4th = 82 km/h (51 mph)

Note: with 3.73's and 35's...this 4.88's and 37's is now exactly 500 rpm higher for the same speeds.

Lastly, my Captain America dash light is coming on and saying the start/stop system needs service, even though i changed the tazer setting to 4.88's when i left the shop. Comes on after each start and get to about 40 km/h. Will have to dig into this, surely it's a simple fix. I have it disabled in the tazer settings so unsure whats up.
Quick question. Have you noticed any performance issues with the clutch, specifically? If you haven't seen, there's another recall out for the 6-speed. I'm frustrated because I was planning on 37s and 4.88s but I'm not sure I trust the clutch now...
 

hjdca

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Quick question. Have you noticed any performance issues with the clutch, specifically? If you haven't seen, there's another recall out for the 6-speed. I'm frustrated because I was planning on 37s and 4.88s but I'm not sure I trust the clutch now...
No problems with the clutch with my 5:13s. In fact the new gears are better for the clutch because you can let it out faster with less gas because the gears are lower. Taking off from stop needs barely any gas. No clutch burning or smell even on a steep hill.
 
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Jt-wrx

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Quick question. Have you noticed any performance issues with the clutch, specifically? If you haven't seen, there's another recall out for the 6-speed. I'm frustrated because I was planning on 37s and 4.88s but I'm not sure I trust the clutch now...
What he said above, no issues for me either, runs awesome. At 30,000 kms now, just perkin right along. Very happy.
 

bgoman

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No problems with the clutch with my 5:13s. In fact the new gears are better for the clutch because you can let it out faster with less gas because the gears are lower. Taking off from stop needs barely any gas. No clutch burning or smell even on a steep hill.
What he said above, no issues for me either, runs awesome. At 30,000 kms now, just perkin right along. Very happy.
Great to hear! Thank you!

 

 
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