new rear gears,which ratio? September 29, 2007, 09:45:07 PM I have an 88 5.0/HO with AOD trans and 8" rear with 2.78 Gears. (not original rear). The trans will not stay in OD unless I'm doing about 70mph, otherwise it starts hunting for the right gear based on rpm. What would be a good all around gear ratio, non-posi? 3:23, 3:55 ??? Thanks for the help. Quote Selected
new rear gears,which ratio? Reply #1 – September 29, 2007, 09:55:29 PM 3.55 or 4.10 depending on how much freeway commuting you do Quote Selected
new rear gears,which ratio? Reply #2 – September 29, 2007, 10:08:35 PM I like the 3.55's for a good al around gear.The 3.73 or 4.10 for more performance.I do a lot of highway driving,so 3.55's are it. Quote Selected
new rear gears,which ratio? Reply #3 – September 29, 2007, 10:28:46 PM 4.10's for me. I have done highway cruising with them and they aren't bad. Quote Selected
new rear gears,which ratio? Reply #4 – September 30, 2007, 01:44:27 AM By the way chances are you have an 8.8" with a 2.73 gear (thats what a lot of mustangs had).Theres a lot of different opinions on how 'okay' different gears are on the highway. Some people will say 4.10' or even 4.30's are okay on the highway, while some say they arent. Youll probably only lose a couple mpg between 3.55 and 4.10. One things for sure, it would be better around town.Obviously if youre trying to keep cruising rpms down then a taller gear would be better, 3.08-3.55. But if you really want an harder punch off the line 3.73-4.10+ would be the right choice. Quote Selected
new rear gears,which ratio? Reply #5 – October 01, 2007, 07:16:38 PM I run 3.73 gears with mine. Nice and they are fine on the highway in OD. Quote Selected
new rear gears,which ratio? Reply #6 – October 01, 2007, 10:28:18 PM Quote from: thunderjet302;180068I run 3.73 gears with mine. Nice and they are fine on the highway in OD.X2 or X3, whatever...With automatic and a performance cam, I wouldn't run anything less than 3.73s... The 3.55 are good with a stock HO cam...Even 4.10s are no concern with the OD trannys... Final ratio in OD is 2.74... I have a Aerostar with 3.0 and 4.10s FACTORY, and of course the Lightning has 4.10s... Quote Selected
new rear gears,which ratio? Reply #7 – October 04, 2007, 10:15:43 PM Motive and Strange make a 3.90:1 that's a nice compromise between 3.73s and 4.10s. That's what I would go with. Quote Selected
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