what gears are best 373 0r 355
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90mustangfan
New Member
with a auto for sure bro get 4.10's, you wont regret it...I had 4.10's in a 5spd, and imo I still could have went to 4.30's and have been very confortable on the street. this was in a daily driver also...ah 4.10's were great, it also made up for the lack of hp I had.
bill302
Active Member
IMO, if your engine is stock, get the 3.73's. 4.10's are a little too much gear for me with a stock cam. The engine doesn't need to rev that high on the freeway 
I've got 3.45's with my 5-speed and I wouldn't get any other gear for that on the street. If I had an auto though, I would do the 3.73's.
I've got 3.45's with my 5-speed and I wouldn't get any other gear for that on the street. If I had an auto though, I would do the 3.73's.
Flavadave4
Active Member
I had a 4.10 with an auto and a H/C/I motor. It pulled very hard in 3rd gear. But it would not shift into 4th under WOT, and 1st gear went by way too fast! I say 3.73's and a nice shift kit. 1st to 2nd shifts were at like 4,700 for me, unless I did the AOD SHUFFLE!!!!! Yeah!!!
magnj - At 70-80mph, you will typically see 2,400-2,600 rpm at cruise. That pushes it for me, because I do some long interstate trips a few times a month.
A 4.10 would have a higher cruise rpm than above, which is 3.73.
A 4.10 would have a higher cruise rpm than above, which is 3.73.
I have a 91 LX 5.0L 5 speed. 3.73's at 80MPH is at 3,000. If you have an auto, you only have 4 speeds, so your RPM will be higher than 3K at 80MPH. I would suggest 3.55's then for highway, but 3.73 for best overall.
87Mustang351
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MarcMonteverde
New Member
mrmustangman357
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- Feb 11, 2007
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huh? "If you have an auto, you only have 4 speeds, so your RPM will be higher than 3K at 80MPH" . . . the AOD is an overdrive trans. it goes into an overdrive gear on the highway just like a manual trans.
with 4.10s in a stick, first gear goes by quickly. but the auto this is okay. 3.90 is a good gear for the 5.0. if the motor was a 4.6, which makes all its power by revving with little torque, i would say go for 4.10. but for an auto fox with a 5.0 i would say 3.90
Mine sits at 2,650 or so at 80mph.
Gear Calculator:
http://www.allfordmustangs.com/Detailed/608.shtml
Reference with T5 transmission/stock tire size/16in. wheel, in 5th gear cruising rpm at 70mph (Interstate Speed):
2.73:1 - 1696 RPM
3.08:1 - 1914 RPM
3.27:1 - 2032 RPM
3.55:1 - 2206 RPM
3.73:1 - 2318 RPM
3.90:1 - 2423 RPM
4.10:1 - 2548 RPM
4.30:1 - 2672 RPM
4.56:1 - 2834 RPM
troyGT03
New Member
had an auto with 4.10 . loved it but would still go 3.73. the 4.10 was fun but was a little too much on the highway. my .02
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