S/ST - 3.89 vs 4.10

DailyDriverSst · 09-14-2022, 08:38 PM

I am switching from a Chrysler 8.75 to a Ford 9 over winter. Just can't get 8.75 stuff anymore.

Right now I have a 4.10 gear and go through the traps at 6,000 RPM. I am debating ordering the new axle with a 3.89 gearset instead of 4.10 . Have a 1.98 low in the powerglide.

How much can I expect my short numbers and ratios to change, if at all?

Converter stalls to 4,000 RPM and it's a factory frame rail truck with full interior.

TIA

09-14-2022, 08:38 PM	#1
DailyDriverSst Junior Member Join Date: Dec 2017 Posts: 56 Likes: 0 Liked 7 Times in 6 Posts	S/ST - 3.89 vs 4.10 I am switching from a Chrysler 8.75 to a Ford 9 over winter. Just can't get 8.75 stuff anymore. Right now I have a 4.10 gear and go through the traps at 6,000 RPM. I am debating ordering the new axle with a 3.89 gearset instead of 4.10 . Have a 1.98 low in the powerglide. How much can I expect my short numbers and ratios to change, if at all? Converter stalls to 4,000 RPM and it's a factory frame rail truck with full interior. TIA Last edited by DailyDriverSst; 09-14-2022 at 08:47 PM.